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1

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Finite element method applied to the problem of stability of a non-conservative system (1971)

Barsoum, Roshdy S.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 63-87

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ISSN: 0029-5981

Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Notes: The finite element method is applied to the stability analysis of structural systems subject to non-conservative forces. The development of the method is general, but the specific application considered here is the stability of thin-walled members subject to follower forces. The method predicts the type of instability, whether it be buckling or flutter. Example problems, for which exact solutions are known, illustrate the accuracy and convergence characteristic of the finite element formulation.

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URL: http://dx.doi.org/10.1002/nme.1620030110

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Dynamic analysis of structures using the rank force method (1971)

Robinson, John ; Petyt, Maurice

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 103-117

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ISSN: 0029-5981

Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Notes: The application of the finite element rank force method for the dynamic analysis of redundant structures is presented. The applied loading consists of discrete and distributed loads. Both forced and free vibrations are considered, the latter yielding latent vectors corresponding to dynamic redundancies.It is shown that the dynamic properties of an element are given by a static flexibility matrix, an inverse mass matrix, a damping parameter and a displacement vector representing the effect of the applied distributed loading.

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URL: http://dx.doi.org/10.1002/nme.1620030112

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An annular segment finite element for plate bending (1971)

Sawko, F. ; Merriman, P. A.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 119-129

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ISSN: 0029-5981

Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Notes: A stiffness matrix for a finite element having the planform of an annular segment is derived using the displacement approach. Numerical problems involved in the derivation are discussed and rapid convergence to exact solutions is demonstrated on three sample problems. It is concluded that the new element will be of great value to engineers concerned with the analysis of slabs of bridge decks curved in plan.

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URL: http://dx.doi.org/10.1002/nme.1620030113

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Stress and deformation analysis of fibrous composite materials by point matching (1971)

Lessa, Arthur W. ; Clausen, William E. ; Agrawal, G. K.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 89-101

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ISSN: 0029-5981

Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Notes: The point matching numerical method and its generalization, the method of boundary point least squares, have been successfully applied to numerous boundary value and eigenvalue problems. The present paper demonstrates the application of these techniques to problems in the micromechanics of fibrous composite materials, i.e. determination of elastic moduli and stress concentrations for parallel-fibre materials which are loaded transversely with respect to the fibres. The solution technique utilizes exact solutions of the governing equations of plane elasticity for each component fibre and its surrounding matrix material in a typical repeating section of the composite material. The continuity conditions for stresses and displacements between fibre and matrix and the repeatability conditions at the boundary of the repeating section are satisfied approximately in a pointwise manner. Some special numerical techniques which were found to be particularly useful in applying the point matching method to these problems are delineated. The method is demonstrated for composite materials having circular, elliptical and square fibres in regular, staggered arrays. Numerical results are given which show the accuracy of the method as well as stress concentration and composite elastic moduli data.

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URL: http://dx.doi.org/10.1002/nme.1620030111

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Concave programming and piece-wise linear programming (1971)

Rozvany, G. I. N.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 131-144

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ISSN: 0029-5981

Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Notes: This paper discusses the mathematical foundations of a technique that has been used extensively in structural optimization.1-6 Two basic problems are considered. The first of these is the concave programming problem which consists of finding the global minimum of ‘piece-wise concave functions’ on ‘piece-wise concave sets’. Since any function can be approximated by a piece-wise concave function, this method could in principle be used to find the global minimum in non-convex optimization problems. The second one is the piece-wise linear programming problem in which the objective function is convex and piece-wise linear. The iterative method outlined for handling this problem is shown to be much more efficient than the standard simplex method of linear programming.

Additional Material: 13 Ill.

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URL: http://dx.doi.org/10.1002/nme.1620030114

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A frontal solution program for finite element analysisB. M. Irons, ‘A frontal solution program for finite element analysis’, Int. J. num. Meth. Engng, 2, 5-32 (1970). (1971)

Hellen, T. K.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 149-149

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ISSN: 0029-5981

Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/nme.1620030116

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Editorial notice (1971)

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 154-154

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ISSN: 0029-5981

Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/nme.1620030202

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Reduced integration technique in general analysis of plates and shells (1971)

Zienkiewicz, O. C. ; Taylor, R. L. ; Too, J. M.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 275-290

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ISSN: 0029-5981

Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Notes: The solution of plate and shell problems by an independent specification of slopes and middle surface displacements is attractive due to its simplicity and ability of reproducing shear deformation. Unfortunately elements of this type are much too stiff when thickness is reduced.In an earlier paper a derivation of such an element was presented1 which proved very successful in ‘thick’ situations. Here a very simple extension is made which allows the element to be economically used in all situations.The improved flexibility is achieved simply by reducing the order of numerical integration applied to certain terms without sacrificing convergence properties. The process is of very wide applicability in improvement of element properties.

Additional Material: 10 Ill.

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URL: http://dx.doi.org/10.1002/nme.1620030211

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Masthead (1971)

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971)

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ISSN: 0029-5981

Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/nme.1620030301

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Discussion of paperS. Gallof and B. Kaplan, ‘Numerical solution and utilization of Green's functions,’ Int. J. num. Meth. Engng, 1, 169-175 (1969). by S. Gallof and B. Kaplan (1971)

Mullineux, N. ; Reed, J. R.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 295-296

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ISSN: 0029-5981

Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/nme.1620030214

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A static and dynamic finite element shell analysis with experimental verification (1971)

Klein, Stanley

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 299-315

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ISSN: 0029-5981

Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Notes: A system of finite element shell analysis codes, called SABOR/DRASTIC, is used to analyse a complex two-layered shell of revolution under static and dynamic asymmetric loads. The dynamic analysis is compared with experimentally measured response. In this linear elastic analysis, emphasis is placed on the inherent flexibility of the finite element method in modelling the complex structural geometry of a given test specimen. Static studies, which involve variations in important shell parameters, and dynamic studies, which provide a successful correlation with experiment, are used to illustrate both the detail and the generality with which shell analyses may now be performed with confidence.

Additional Material: 11 Ill.

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URL: http://dx.doi.org/10.1002/nme.1620030302

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On the calculation of consistent stress distributions in finite element approximations (1971)

Oden, J. T. ; Brauchli, H. J.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 317-325

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ISSN: 0029-5981

Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Notes: The theory of conjugate approximations1 is used to obtain consistent approximations of stress fields in finite element approximations based on displacement assumptions. These consistent stresses are continuous across interelement boundaries and involve less mean error than those computed by the conventional approach.

Additional Material: 1 Ill.

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URL: http://dx.doi.org/10.1002/nme.1620030303

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Generation of two- and three-dimensional finite elements (1971)

Boisserie, J. M.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 327-347

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ISSN: 0029-5981

Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Notes: Many of the known finite elements are based on a variational procedure in a functional basis of monomials. The present paper attempts to formulate completely a finite element procedure which is non-variational on a functional basis which is left to the choice of the user.

Additional Material: 5 Ill.

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URL: http://dx.doi.org/10.1002/nme.1620030304

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Discussion of paperSuryanarayan Patnaik and Pasala Dayaratnam, ‘Behaviour and design of pin connected structures’, Int. J. num. Meth. Engng, 2, 579-595 (1970). by Suryanarayan Patnaik and Pasala Dayaratnam (1971)

Robinson, John

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 443-444

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ISSN: 0029-5981

Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/nme.1620030312

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Network-topological formulation of analysis and design of rigid-plastic framed structures (1971)

Fenves, S. J. ; Gonzalez-Caro, A.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 425-441

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ISSN: 0029-5981

Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Notes: A unified network-topological approach to the formulation and solution of the analysis and minimum weight design of rigid-plastic structural systems is presented. It is shown that both analysis and design can be formulated using network concepts, but that, in contrast to elastic networks, the formulation results in a mathematical programming problem. Formulations based both on the static and kinematic theorems of plasticity are presented, and it is shown that duality guarantees that the two types of formulation yield identical results. The problem is first formulated on the basis of a simple definition of yielding, and is then generalized to the case where yielding is defined in terms of a yield surface.

Additional Material: 4 Ill.

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URL: http://dx.doi.org/10.1002/nme.1620030311

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Non-linear structural analysis by dynamic relaxation (1971)

Brew, J. S. ; Brotton, D. M.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 463-483

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ISSN: 0029-5981

Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Notes: Dynamic relaxation, an iterative method for use with digital computers, is described and is shown to be suitable for the solution of a system of linear equations and in particular for such problems derived from structural frame analysis. It is further shown that the method may be modified to include non-linear equations relating to these problems.Some specific examples of linear and non-linear solutions are given and comparisons are made with another computer method which performs the same tasks.

Additional Material: 12 Ill.

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URL: http://dx.doi.org/10.1002/nme.1620030403

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A finite-deflection analysis of shallow arches by the discrete element methodThis paper is Crown copyright and is reproduced here with the permission of the Controller, Her Majesty's Stationery Office. (1971)

Dawe, D. J.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 529-552

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ISSN: 0029-5981

Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Notes: The discrete element displacement method is used to analyse the finite-deflection behaviour of shallow arches. The arches are idealized as assemblies of shallow curved elements and the necessary properties of the displacement patterns in these elements are discussed. Numerical solutions of the geometrically non-linear problem are obtained by directly minimizing the total potential energy of the system.

Additional Material: 9 Ill.

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URL: http://dx.doi.org/10.1002/nme.1620030408

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Global-local finite element (1971)

Mote, C. D.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 565-574

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ISSN: 0029-5981

Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Notes: Finite element procedures usually require more degrees of freedom for a specified accuracy than does a classical Ritz procedure if suitable coordinate functions are available. This paper develops a combined global and local dependent variable representation which couples the conventional and finite element Ritz methods. This hybrid method preserves much of the flexibility of the finite element method while increasing the solution accuracy for a specified system order. The method is illustrated by examination of a beam and a plate vibration problem.

Additional Material: 5 Ill.

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URL: http://dx.doi.org/10.1002/nme.1620030410

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A simple algorithm for the stiffness matrix of triangular plate bending elementsThe authors are indebted to the referees for many comments and suggestions. (1971)

Kratochvíl, J. ; Ženíšek, A. ; Zlámal, M.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 553-563

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ISSN: 0029-5981

Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Notes: For a hierarchy of polynomials on the triangle there is derived an algorithm for computing the stiffness matrix of the plate bending element. The algorithm is easy to program and means a considerable saving of the computing time. The same approach can be used for any elliptic equation with constant coefficients.

Additional Material: 1 Ill.

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URL: http://dx.doi.org/10.1002/nme.1620030409

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Improved numerical integration of thick shell finite elements (1971)

Pawsey, Stuart F. ; Clough, Ray W.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 575-586

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ISSN: 0029-5981

Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Notes: A quadratic thick shell element derived from a three-dimensional isoparametric element was first introduced by Ahmad and co-workers in 1968. This element was noted, however, to be relatively inefficient in representing bending deformations in thin shell or thin plate applications. The present paper outlines a selective integration scheme for evaluating the stiffness matrix of the element, in which each component of the strain energy is evaluated separately using a different Gaussian integration grid for each contribution. By this procedure, the excessive bending stiffness of the element, which results from the use of me quadratic interpolation functions, is avoided.The improved performance of this element, as compared with the original thick shell element, is demonstrated by analyses of a variety of thin and thick shell problems. Editors' note: A similar development was outlined by O. C. Zienkiewicz and co-workers in lnt. J. num. Meth. Engng, 3, 275-290 (1971). Some important details differ between the two papers which are thus complementary.

Additional Material: 14 Ill.

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URL: http://dx.doi.org/10.1002/nme.1620030411

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An introduction to applied probability and random processes, J. B. Thomas, Wiley, New York, 1971. No. of pages: 350. Price: £6·15 (1971)

Robson, J. D.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 591-592

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ISSN: 0029-5981

Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/nme.1620030415

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Masthead (1971)

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971)

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ISSN: 0029-5981

Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/nme.1620030101

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Erratum (1971)

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 1-2

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ISSN: 0029-5981

Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/nme.1620030102

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Editorial (1971)

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 3-3

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ISSN: 0029-5981

Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/nme.1620030103

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The finite difference and localized Ritz methods (1971)

Croll, J. G. A. ; Walker, A. C.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 155-160

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ISSN: 0029-5981

Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Notes: The conventional central finite difference equations for the plane stress extension of flat plates are derived as a localized Ritz process. A dual differential-variational discretization of this type enables common classification of the finite difference and finite element methods. Also, it provides alternative methods of establishing sufficiency conditions and relative rates of convergence for discrete systems derived from a localized Ritz process, and the existence of solution bounds for discrete systems derived using difference procedures.

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URL: http://dx.doi.org/10.1002/nme.1620030203

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Finite element formulation of general electrothermoelasticity problems (1971)

Oden, J. T. ; Kelley, B. E.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 161-179

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ISSN: 0029-5981

Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

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Notes: This paper is concerned with the development of consistent discrete models, via the concept of finite elements, of linear and non-linear electrothermomechanical behaviour of continuous bodies. In the development, general energy balances are utilized to derive equations governing electromagnetic fields over an element and coupled equations of motion and heat conduction of a typical element of the continuum. These equations make it possible to study a general class of field problems involving arbitrary geometries and boundary conditions. Sample problems are included.

Additional Material: 9 Ill.

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URL: http://dx.doi.org/10.1002/nme.1620030204

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Axial wave propagation in membrane shells of revolution (1971)

Counts, J. ; Bennett, J. G.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 181-198

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ISSN: 0029-5981

Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

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Notes: The dynamic finite element technique, which is referred to in the literature as ‘computer-analysis’, is applied to wave propagation problems occurring in finite and semi-infinite linearly elastic membranes of revolution. Both semi-infinite and finite versions of cylindrical and conical membranes are considered, and a finite membrane having a meridional curve which is parabolic is solved. The source of excitation is generally a constant velocity motion of one end of the membranes, but the results for a stress-pulse input at one end of a semi-infinite cylindrical membrane are also given. The results for the finite membranes are new, and the results for the semi-infinite problems are discussed with respect to previously published results. The two-dimensional state of stress in the membrane requires careful ordering of the calculations, and the boundary conditions for finite membranes are shown to follow logically from this ordering of the calculations. The difference in the solutions resulting from prescribing an axial or a tangential velocity excitation at the end of a conical membrane is presented, and the mesh size necessary for convergence to the solution is indicated. The graphs of the results clearly indicate regions in space and time where the membrane model should be replaced by the shell formulation to represent a realistic structure. The technique is shown to be self-contained and independent of any formal method such as the method of characteristics.

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URL: http://dx.doi.org/10.1002/nme.1620030205

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Dynamic programming and the solution of the biharmonic equation (1971)

Distéfano, Néstor

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 199-213

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ISSN: 0029-5981

Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

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Notes: The numerical solution of the biharmonic equation in a rectangular domain is presented in the context of continuous dynamic programming techniques. The equations are specialized to the solution of elastic rectangular plates. A suitable approximate expression of a certain functional equation containing derivatives only in one direction is used to derive equations for the stiffness and flexibility matrices of the plate. It is shown that those matrices satisfy matrix Riccati equations subject to suitable initial conditions. It is also shown that the condition of optimality in the Hamilton-Jacobi-Bellman equation directly expresses a classical variational principle, i.e. the principle of complementary energy. Some numerical examples are finally presented.

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URL: http://dx.doi.org/10.1002/nme.1620030206

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Non-linear programming for the plastic analysis of local deformations in shell structures (1971)

Morris, A. J.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 215-232

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ISSN: 0029-5981

Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Notes: The paper presents an analysis of the response of plastic spherical and cylindrical shells subjected to loads applied through a rigid boss. Special emphasis is placed on following the load-deflection behaviour of these structures after the application of the yield-point load in order to predict the appearance of any snapping action.The method of analysis assumes that upper bound calculations are applicable and that the associated velocity fields can be represented by a series of piecewise continuous polynomials. The internal dissipation of energy for the structures are then written in terms of the coefficients of these polynomials and the values appropriate to the solution are found by using a non-linear programming routine.The results of this analysis are correlated with a non-dimensional boss size parameter p and compared with the results of experimental investigations. Mention is also made of the possible effects of initial imperfections.

Additional Material: 12 Ill.

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URL: http://dx.doi.org/10.1002/nme.1620030207

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Trigonometric function representations for rectangular plate bending elements (1971)

Chakrabarti, Subrata

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 261-273

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ISSN: 0029-5981

Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Notes: A study of bending of plates for small deformations by applying the finite element method is presented in this paper.A new class of displacement functions has been developed for rectangular bending elements. For the first time a method is proposed for the derivation of displacement functions in which trigonometric expressions that had apparently failed to yield satisfactory results in earlier attempts can be used along with polynomial terms.The derivation leads to conforming type of displacement functions which satisfy the convergence criterion. The approach also demonstrates how many more new displacement functions can be found.

Additional Material: 7 Ill.

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URL: http://dx.doi.org/10.1002/nme.1620030210

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A steepest gradient method for optimum structural design (1971)

Templeman, Andrew B.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 249-259

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ISSN: 0029-5981

Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Notes: This paper describes a search procedure for finding the unconstrained maximum or minimum of a function of many independent variables. If this function represents the volume, cost, stiffness, etc. of a structure and each of the independent variables is associated with a parameter governing the geometry of the structure then designs of optimum geometry may be made in certain cases with the assistance of this search procedure. The procedure consists of steepest gradient calculations used in conjunction with a reverse Fibonacci location process. A ridge-following technique is included to speed convergence in addition to localized exploration in the region of an optimum.The search procedure has been programmed for computer use and an outline of its structural design applications is presented together with an example of its efficiency in a specific case.

Additional Material: 6 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/nme.1620030209

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Quadrature rules for brick based finite elements (1971)

Irons, Bruce M.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 293-294

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Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Additional Material: 1 Tab.

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URL: http://dx.doi.org/10.1002/nme.1620030213

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A note on accuracy and convergence of finite element approximations (1971)

Oden, J. T. ; Brauchli, H. J.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 291-292

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Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/nme.1620030212

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Recent advances in matrix methods of structural analysis and design, edited by R. H. Gallagher, J. T. Oden and Y. Yamada, University of Alabama Press, Alabama, 1971. No. of pages: 904. Price: $32.50 (1971)

Fenves, Steven J.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 446-446

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Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/nme.1620030315

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Discussion of paperR. S. Barsoum and R. H. Gallagher, ‘Finite element analysis of torsional and torsional-flexural stability problems’, Int. J. num. Meth. Engng, 2, 335-352 (1970). by R. S. Barsoum and R. H. Gallagher (1971)

Medland, I. C.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 444-445

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Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

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URL: http://dx.doi.org/10.1002/nme.1620030313

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Announcements (1971)

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 447-448

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Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/nme.1620030316

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Masthead (1971)

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971)

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Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

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URL: http://dx.doi.org/10.1002/nme.1620030401

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The elasto-plastic indentation of a half-space by a rigid sphere (1971)

Hardy, C. ; Baronet, C. N. ; Tordion, G. V.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 451-462

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Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

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Notes: Using the finite element method, a detailed study of the deformations and stresses produced in an elastic-perfectly plastic half-space indented by a rigid sphere was done. The analysis covers the transition region from the maximum elastic contact load to a state where this load has been increased one hundredfold. Experimental results available in the literature are in good agreement with the analysis. In solving repeatedly the large number of linear equations involved in the solution of the problem, it was found profitable, in order to save computer time, to modify the direct elimination method. This technique is described in some details in the paper.

Additional Material: 12 Ill.

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URL: http://dx.doi.org/10.1002/nme.1620030402

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A note on convergence of finite element solutions (1971)

Yamamoto, Yoshiyukl ; Tokuda, Naoaki

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 485-493

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Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Notes: The convergence of nodal displacements obtained by the finite element method is investigated for special element patterns in plane elasticity with the aid of the differential equation derived from the equilibrium condition at each node. The convergence of strains is also discussed. It is shown that averaging is an effective tool for obtaining approximations to strain for some kinds of mesh arrangement. It is also shown that the approach becomes inaccurate along force boundaries.

Additional Material: 9 Ill.

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URL: http://dx.doi.org/10.1002/nme.1620030404

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A refined curved element for thin shells of revolution (1971)

Popov, E. P. ; Sharifi, P.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 495-508

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Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

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Notes: A refined axisymmetric curved finite element for the analysis of thin elastic-plastic shells of revolution is described in the paper. The improved element is obtained by employing cubic polynomials in terms of local Cartesian co-ordinates for the assumed in-plane and out-of-plane displacements. This introduces into the solution two internal degrees of freedom in the cord direction of each element. These internal degrees of freedom are removed by static condensation before assembling the individual element stiffness matrices, and are subsequently recovered after the nodal displacements are obtained. On comparison with the previous formulation, this procedure greatly improves the accuracy of the solution especially with regards to in-plane stress-resultants at discontinuities in the meridional curvature and interelement equilibrium of forces. The latter fact makes it possible to analyse shells with a discontinuous meridional slope. In using this element, improvement in the convergence of the elastic-plastic solutions has also been observed.Several examples illustrate the quality of solutions. The reported study is limited to axisymmetric loadings cum boundary conditions.

Additional Material: 14 Ill.

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URL: http://dx.doi.org/10.1002/nme.1620030405

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Numerical methods for evaluation of equilibrium composition of ideal gases (1971)

Williams, T. J.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 509-517

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Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Notes: This paper considers methods of solution of the relevant equations based on the Newton-Raphson process. Expressions are derived for calculation with both good and very poor initial guesses and for calculation of pressure, volume and temperature during an equilibrium process. A method of programming the calculations is outlined. Variations and modifications to suit specific situations are discussed.

Additional Material: 1 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/nme.1620030406

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An automatic mesh generation scheme for plane and curved surfaces by ‘isoparametric’ co-ordinates (1971)

Zienkiewicz, O. C. ; Phillips, D. V.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 519-528

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Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Notes: A computer orientated method is presented which generates meshes of triangular elements in plane and curved surfaces. Depending on geometrical and material variations, the region to be discretized is divided into a number of four sided zones. By using curvi-linear co-ordinate systems, nodes within and on the boundary of each zone are automatically positioned and referenced to a global Cartesian co-ordinate system. Elements are automatically assembled from these nodes. Input data is required to specify the positions and material properties of each zone and how they are connected. Examples are given which illustrate the range of meshes that can be generated. Extension of the method to generate three-dimensional tetrahedral elements is indicated.

Additional Material: 10 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/nme.1620030407

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Incremental displacement in non-linear analysis (1971)

Zienkiewicz, O. C.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 587-588

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ISSN: 0029-5981

Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/nme.1620030412

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An introduction to APL, W. Prager, Allyn and Bacon, Boston, 1971. No. of pages: 134 (1971)

Owen, D. R. J.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 591-591

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Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/nme.1620030414

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Letters to the editor (1971)

Gupta, K. K. ; Totenham, H. ; Brebbia, C.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 588-591

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Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/nme.1620030413

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Vibration analysis of rotating cantilever plates (1971)

Dokainish, M. A. ; Rawtani, S.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 233-248

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Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Notes: A finite element technique is used to determine the natural frequencies and the mode shapes of a cantilever plate mounted on the periphery of a rotating disc. The plane of the plate is assumed to make any arbitrary angle with the plane of rotation of the disc. The distributed centrifugal force is resolved into two components - one acting in the plane of the plate and the other normal to the plate. The stresses produced in the middle surface of the plate due to the in-plane forces are first determined. The increase in the bending stiffness of the plate elements due to these in-plane stresses is obtained in a manner similar to that used in the stability analysis of plates. The component of the distributed centrifugal force normal to the plate surface is added to the inertia force.From the results of computations carried out for various values of the aspect ratio, the speed of rotation, the disc radius and the setting angle, empirical formulae are derived giving the effect of these parameters on the natural frequencies. These empirical formulae are observed to be in agreement with the corresponding known formulae for rotating cantilever beams, when the aspect ratio is high.

Additional Material: 8 Ill.

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URL: http://dx.doi.org/10.1002/nme.1620030208

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Numerical control, olesten, Wiley-Interscience, New York, 1970. No. of pages: 645. Price: £9.50 (1971)

Leslie, W. H. P.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 445-446

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Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/nme.1620030314

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The numerical solution of non-linear consolidation problems (1971)

Poskitt, T. J.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 5-11

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Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Notes: It has long been recognized that permeability, compressibility and viscosity vary during the consolidation of soil. However, the introduction of these variations into consolidation theory leads to formidable difficulties due to their rendering the equations highly non-linear. Numerical methods are given herein which enable the governing equation to be solved for a variety of different non-linear laws.

Additional Material: 3 Ill.

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URL: http://dx.doi.org/10.1002/nme.1620030104

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Application of the simultaneous iteration method to undamped vibration problems (1971)

Jennings, Alan ; Orr, D. R. L.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 13-24

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Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Notes: The simultaneous iteration method of obtaining eigenvalues and eigenvectors is employed for the solution of undamped vibration problems. This method is of significance when a few of the dominant eigenvalues and eigenvectors are required from a large matrix, and hence is particularly suitable for vibration problems involving a large number of degrees of freedom. It is shown that advantage may be taken of both the symmetry and the band form of the mass and stiffness matrices, thus making it feasible to process on a computer larger order vibration problems than can be processed using transformation methods. A method of allowing for body freedom is given and some numerical tests are discussed.

Additional Material: 2 Ill.

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URL: http://dx.doi.org/10.1002/nme.1620030105

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An economical method for determining the smallest eigenvalues of large linear systems (1971)

Wright, G. C. ; Miles, G. A.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 25-33

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Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Notes: The general eigenvalue problem Ax = λBx as arising from vibration problems tackled by the finite element method is often solved by the economization method in which the two matrices are reduced to a more manageable size and approximate answers are obtained.This paper analyses the method in a more mathematical way than previous accounts and leads to a definition of the optimum set of variables to be retained during the reduction. An extension to the method is suggested which allows the approximate eigenvalue to be improved and bounds are obtained on the eigenvalues of the full problem before reduction.An estimate is made of the calculation involved in the method and it is concluded, by reference to examples, that the extended method leads to a more efficient algorithm.

Additional Material: 3 Tab.

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URL: http://dx.doi.org/10.1002/nme.1620030106

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Solution of the compressible flow equations (1971)

Gelder, D.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 35-43

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Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Notes: A technique is described for solving the compressible flow equations in subsonic flow. The general quasi-linear equation ∇.g∇v = 0 is considered with g a function of ∇v. ∇v, and iterations of the form ∇.gn∇vn+1 = 0 are analysed, where g0 is suitably chosen and gn defined from vn for n≥1. This approach is applied to the compressible flow equations in terms of a velocity potential ø: monotonic convergence is predicted and at each iteration the error is multiplied by a factor less than the square of the greatest Mach number in the solution.Reliable convergence has been obtained in practice solving the linear equation for øn+1 by a finite difference method. The alternative of working in terms of the stream function ψ is discussed, and also discretization by the finite element method.

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URL: http://dx.doi.org/10.1002/nme.1620030107

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The piecewise-linear analysis of two connecting structures including the effect of clearance at the connections (1971)

Scholes, A. ; Strover, E. M.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 45-51

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Source: Wiley InterScience Backfile Collection 1832-2000

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Notes: A method of analysis is presented for two structures which have connections with clearance. It is assumed that the behaviour of the structures is described, by the movement of discrete nodes and that as the load on the structure changes, clearances open or close between corresponding nodes on the structures; each time this occurs the stiffness of the combined structure changes because its configuration has changed. Between these changes, the structure will behave linearly and the overall behaviour can be described as piecewise linear. Applications include diesel engine crankshafts with bearing clearances and the wrap-around problem in pin-and-eye connections.

Additional Material: 4 Ill.

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URL: http://dx.doi.org/10.1002/nme.1620030108

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Non-axial-symmetric thermal stresses in circular discs or cylinders (1971)

Kettleborough, C. F.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 53-61

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Source: Wiley InterScience Backfile Collection 1832-2000

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Notes: A solution is presented for the computation of the transient thermoelastic stresses in a hollow cylinder with temperature boundary conditions given as a circumferential variation of surface heat transfer coefficient. The temperature distribution is solved explicitly. The problem is set up using the Airy stress function which leads to the biharmonic equation. This approach requires the satisfaction of three Michell integrals at the inner boundary in order to ensure single-valued displacements and rotation. An iterative method is described in which these integrals are all simultaneously satisfied and thus provide the necessary non-zero boundary conditions for the solution of the biharmonic equation which is rapidly solved by Gaussian elimination. Results are presented for the general case where the temperature is a function of r and θ. The computer program is checked by assuming a constant value of the surface heat transfer coefficients. In this case a closed form solution is obtained.

Additional Material: 6 Ill.

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URL: http://dx.doi.org/10.1002/nme.1620030109

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Note on dynamic relaxation (1971)

Wood, Winifred L.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 145-147

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Source: Wiley InterScience Backfile Collection 1832-2000

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Notes: The Dynamic Relaxation (DR) method of solving a set of simultaneous linear equations requires an estimate of the spectral radius of the matrix. Dividing each equation by the corresponding row sum of moduli of the elements of the matrix gives a convenient upper bound of unity to this. This note shows that the DR method then gives a faster asymptotic rate of the convergence than the degenerate Chebyshev method which it closely resembles.

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URL: http://dx.doi.org/10.1002/nme.1620030115

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Masthead (1971)

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971)

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Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/nme.1620030201

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Process analysis by statistical methods, D. M. Himmelblau, Wiley, New York, 1968. No. of pages: 460. Price: £8·75; $19.95 (1971)

Gunn, D. J.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 151-151

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Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/nme.1620030117

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An equation solver of very large capacity (1971)

Cantin, Gilles

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 379-388

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Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Notes: A very simple equation solver of very large capacity is developed. The method described here does not require a very large in-core memory; however, a fast random access device like a magnetic disk drive is required.

Additional Material: 1 Ill.

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URL: http://dx.doi.org/10.1002/nme.1620030307

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A numerical solution of axisymmetric problems in elastodynamicsThis research was supported by the Research Foundation of the State University of New York. (1971)

Recker, W. W.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 361-377

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Source: Wiley InterScience Backfile Collection 1832-2000

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Notes: The equations governing the axisymmetric dynamic deformation of an elastic solid are considered as a symmetric hyperbolic system of linear first-order partial differential equations. The characteristic properties of the system are determined and a numerical method for obtaining the solution of mixed initial and boundary value problems in elastodynamics is presented. Two examples are considered.

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The solution of structural equilibrium equations by the conjugate gradient method with particular reference to plane stress analysis (1971)

Yettram, A. L. ; Hirst, M. J. S.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 349-360

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Notes: A computer program is described for the analysis of plates in extension using the equivalent plane-framework idealization. The conjugate gradient method is adopted to solve the resulting large number of simultaneous equations. Performance figures are quoted for the program when used on an ICL KDF9 machine with a restriction of 18K on the available core store. The method is generally shown to provide a satisfactory solution to a heavy computational task and thus permits the solution of very large structural systems on a small computer.

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A powerful hybrid method in finite element analysis (1971)

Rao, A. K. ; Raju, I. S. ; Murty, A. V. Krishna

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 389-403

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Notes: An important limitation of finite element analysis, namely, the need for a large number of small elements in regions of finite or infinite stress concentrations and the difficulties of convergence in such cases, is well known. Rao1 suggested a possibility of overcoming this by developing hybrid techniques combining continuum and finite element concepts. In such techniques, each region of stress concentration is covered by one large ‘primary element’ whose description includes term(s) identifying the type and order of concentration, while the remaining structure is split into a few ‘secondary elements’ which are conventional finite elements. In this paper a procedure incorporating this concept is developed and its effectiveness is clearly demonstrated by successful application to two important examples, one of them with stress singularities. The concept, in fact, can be applied equally well to other two- and three-dimensional problems of continua with discontinuities and concentrations.

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Linear programming methods of displacement analysis in elastic-plastic frames (1971)

Baronas, R. P. ; Chyras, A. A.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 415-423

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Keywords: Engineering ; Engineering General

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Notes: The analysis is aimed at determination of displacements in elastic-perfectly plastic frames, in the case of monotonically increasing loads. Spread of partial plasticity from hinges and change of geometry on the conditions of equilibrium are not included. Extremum energy principles and linear programming methods are employed to solve the problem. Both the kinematic and the static formulations of the problem are presented. The mathematical models of the formulations constitute a dual pair of linear programming problems.

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URL: http://dx.doi.org/10.1002/nme.1620030310

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Use of optimization methods to solve heat convection problems with unknown wall boundary conditions (1971)

Gray, Michael ; Smith, Russell A.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 3 (1971), S. 405-413

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Notes: In convection heat transfer problems, it is convenient to solve the governing differential equations by using straightforward marching techniques for numerical integration. However, the boundary layer equations in these heat transfer problems are not of the initial value type even though they are parabolic equations. Consequently marching techniques are not successful until correct initial values are known. A means of determining these initial values is presented herein. Selected optimization methods are utilized in conjunction with marching integration techniques to solve third- and fourth-order ordinary differential equations which have three unknown initial boundary conditions. Two optimization methods, one deterministic and the other non-deterministic in nature, are used both independently and in combination as determined by the particular circumstances. Two applications are used to demonstrate the technique and comparison is made with existing solutions.

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Phosphiran-Komplexe (1971)

Bausch, R. ; Ebsworth, E. A. V. ; Rankin, D. W. H.

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971), S. 111-111

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Chromtrichlorid-tris(aluminiumtrichlorid) (1971)

Lascelles, Keith ; Schäfer, Harald

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971), S. 112-113

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Synthese eines AzacyclolsDiese Arbeit wurde von der Deutschen Forschungsgemeinschaft und dem Fonds der Chemischen Industrie unterstützt. Wir danken der Farbwerke Hoechst AG für die Gewährung des Karl-Winnacker-Stipendiums an M. R. (1971)

Rothe, Manfred ; Tóth, Tibor ; Jacob, Dieter

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971), S. 113-114

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Synthese von 2,5-Piperazindionen mit schwefelhaltigen Brücken zwischen C-3 und C-6Syntheseversuche in der Reihe der 3,6-Epidithio-2,5-piperazindion-Antibiotika Gliotoxin, Aranotin, Sporidesmin und Chaetocin, 1. Mitteilung. - Diese Arbeit wurde von der Hochschuljubiläumsstiftung Wien unterstützt. (1971)

Poisel, Hans ; Schmidt, Ulrich

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971), S. 114-115

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Physikalische Chemie. Teil I: Einführung in die Gastheorie, Quantentheorie, Thermodynamik. Von G. M. Barrow. Friedr. Vieweg u. Sohn, Braunschweig 1969, 1. Aufl., 257 S., 67 Abb., 35 Tab., Paperback DM 19,80 (1971)

Wedler, Gerd

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971), S. 119-119

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1,3,4,2,5-Triazadiborolidin-Derivate (1971)

Nölle, Dieter ; Nöth, Heinrich

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971), S. 112-112

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Rundschau (1971)

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971), S. 118-118

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URL: http://dx.doi.org/10.1002/ange.19710830314

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Methods in Free-Radical Chemistry. Herausgeg. von E. S. Huyser. Marcel Dekker Inc., New York 1969. 1. Aufl., Vol. 1: 208 S., zahlr. Abb., geb. $ 11,75. Vol. 2: XI, 242 S., zahlr. Abb., geb. $ 12,75 (1971)

Rüchardt, Ch.

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971), S. 119-120

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Impressum (1971)

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971)

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Argumente zur Orbital-Reihenfolge in Borazin (1971)

Bock, Hans ; Fuß, Werner

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971), S. 169-170

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Additional Material: 2 Ill.

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Cycloadditionen von Keteniminen an InamineDiese Arbeit wurde vom Fonds de la Recherche Fondamentale Collective unterstützt. (1971)

Ghosez, Léon ; De Perez, Cécilia

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971), S. 171-172

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1,4-Bis(trimethylsilyl)-1,4-dihydropyrazin durch reduktive Silylierung von Pyrazin (1971)

Sulzbach, Reinhard A. ; Iqbal, Abul F. M.

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971), S. 145-145

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Komplexbindung einer Vinylcyclopropan-Gruppe des Bullvalens über eine π-Allyl- und eine σ-Komponente an ein Übergangsmetall (1971)

Aumann, Rudolf

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971), S. 175-176

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Additional Material: 2 Ill.

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URL: http://dx.doi.org/10.1002/ange.19710830511

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Retentive nucleophile Substitutionen an (R)-α-Ferrocenyläthyl-acetat (1971)

Gokel, George W. ; Ugi, Ivar K.

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971), S. 178-179

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Rundschau (1971)

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971), S. 181-181

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Gmelins Handbuch der anorganischen Chemie, 8., völlig neu bearbeitete Auflage. Herausgegeben vom Gmelin-Institut für anorganische Chemie und Grenzgebiete in der Max-Planck-Gesellschaft zur Förderung der Wissenschaften unter der Direktion von Margot Becke-Goehring. Verlag Chemie GmbH, Weinheim/Bergstr (1971)

Fluck, Ekkehard

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971), S. 182-183

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URL: http://dx.doi.org/10.1002/ange.19710830520

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Lehrbuch der anorganischen Chemie. Von A. F. Holleman und E. Wiberg. Walter de Gruyter u. Co., Berlin 1971. 71.-80. Aufl., XXXII, 1209 S., geb. DM 58.- (1971)

Wannagat, Ulrich

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971), S. 183-183

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URL: http://dx.doi.org/10.1002/ange.19710830521

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Impressum (1971)

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971)

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Über den Mechanismus von Kontakteliminierungen, ein Beitrag zum Verständnis der Wirkungsweise polarer Katalysatoren (1971)

Noller, Heinrich ; Andréu, Paulino ; Hunger, Manfred

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971), S. 185-194

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Notes: Es werden die auf Ingold und seine Schule zurückgehenden, in der organischen Chemie üblichen Vorstellungen auf heterogen-katalytische Eliminierungen (meist aus Halogenalkanen und aliphatischen Alkoholen) angewendet. Aus der Aktivität der Katalysatoren, der Reaktivität der Substrate (Reaktanten) und der Primärproduktverteilung wird auf einen heterolytischen Mechanismus geschlossen, ähnlich dem in flüssiger Phase. Die Aktivität der Katalysatoren - Salze und Oxide - steigt mit zunehmender Ladung und abnehmendem Radius der Kationen sowie mit zunehmender Basizität der Anionen. Die Reaktivität der Substrate zeigt weitgehend die von der flüssigen Phase bekannten Charakteristiken. Im Gegensatz zur flüssigen Phase werden primär häufig die cis-Olefine bevorzugt. - Die Stereospezifität der Reaktion wird von der relativen Stärke der Wechselwirkungen zwischen dem Katalysator-Kation und der austretenden Gruppe X- sowie zwischen dem Katalysator-Anion und dem austretenden Proton bestimmt. Beim konzertierten Mechanismus wurde bislang nur trans-Eliminierung gefunden.

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Ein stabiler Bis(tricarbonyleisen)-Komplex des Tetracyclo[4.4.0.05,7.02,10]deca-3,8-diens und dessen dynamisches Verhalten in Lösung (1971)

Aumann, Rudolf

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971), S. 176-177

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Additional Material: 2 Ill.

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83

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Cycloadditionen mit Dithiophosphonsäure-anhydriden; Bildung von Dien-dithiophosphinsäuren (1971)

Ecker, A. ; Boie, Immo ; Schmidt, Ulrich

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971), S. 178-178

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84

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Neue Entwicklungen auf dem Gebiet der Steroidketon-Photochemie (1971)

Schaffner, Kurt

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971), S. 180-180

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The Alkaloids. Herausgeg. von R. H. F. Manske. Academic Press, New York-London. Vol. XI: 1. Aufl. 1968, XVI, 549 S., zahlr. Formeln, geb. $ 26.00; Vol. XII: 1. Aufl. 1970, XVII, 637 S., zahlr. Formeln, geb. $ 29.00 (1971)

Bláha, Karal

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971), S. 184-184

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URL: http://dx.doi.org/10.1002/ange.19710830523

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86

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ESR-Untersuchungen an einem oszillierenden RedoxsystemDiese Arbeit wurde von der Deutschen Forschungsgemeinschaft unterstützt. (1971)

Röder, Albert ; Frühbeis, Horst

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971), S. 208-209

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Additional Material: 2 Ill.

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Der lac-Repressor (1971)

Müller-Hill, Benno

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971), S. 195-207

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Notes: Repressoren sind Proteine, die im Wechselspiel mit Induktoren und Operatoren die Synthese von Enzymen in der Zelle regulieren. Der lac-Repressor sorgt dafür, daß dem Bakterium Escherichia coli die je nach Lactoseangebot im Nährmedium nötige Menge β-Galaktosidase zur Verfügung steht. Aus E. coli hat sich der lac-Repressor isolieren lassen. Der Fortschrittsbericht beschreibt den Weg zu allen diesen Erkenntnissen sowie die Bildung und Wirkungsweise des Repressors.

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Nicht-cheletrope Photo-Decarbonylierung 1,3-diphenyl-substituierter 2-Indanon-Derivate (1971)

Quinkert, Gerhard ; Palmowski, Joachim ; Lorenz, Hans-Peter ; [et al.]

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971), S. 210-212

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Additional Material: 1 Tab.

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89

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Bindungsisomerie bei Sulfinato-Komplexen von Übergangsmetallen (1971)

Lindner, Ekkehard ; Lorenz, Ingo-Peter ; Vitzthum, Günter

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971), S. 213-213

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Additional Material: 1 Tab.

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90

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Molekül- und Kristallstruktur von Bis(1,3-cyclohexadien)monocarbonyleisen (1971)

Krüger, Carl ; Tsay, Yi-Hung

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971), S. 250-251

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Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

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Biogene Substanzen in Sedimenten und FossilienAllgemeine Literatur: I. A. Breger: Organic Geochemistry. Pergamon Press, London 1963; E. T. Degens, Geochemistry of Sediments. Prentice Hall, London 1965; B. Nagy u. U. Colombo, Fundamental Aspects of Petroleum Geochemistry, Elsevier, Amsterdam 1967; P. H. Abelson: Researches in Geochemistry. Wiley, New York 1967, Bd. 2; M. Calvin: Chemical Evolution. Oxford University Press, London 1969; G. Eglinton u. M. T. J. Murphy: Organic Geochemistry. Springer, Berlin 1969; s. auch Advan. Org. Geochem. 1962, 1964, 1966 u. 1968. (1971)

Albrecht, Pierre ; Ourisson, Guy

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971), S. 221-238

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ISSN: 0044-8249

Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Der größte Teil der Sedimentgesteine enthält in fein verteiltem Zustand und in geringer Konzentration organisches Material. Die modernen Analysenmethoden erlauben es, diese Gesteinsproben eingehend zu untersuchen und Rückschlüsse auf die Herkunft der organischen Substanzen zu ziehen. Intakte oder veränderte biogene Verbindungen wie Paraffine, Isoprenoide, Alkohole, Ketone, Carbonsäuren, Steroide, Triterpene und Porphyrine sind aus den löslichen Anteilen des organischen Materials vieler Sedimente sowie aus identifizierten Fossilien verschiedenen geologischen Alters isoliert worden. Sogar präkambrische Gesteine enthalten biogene Substanzen, so daß Lebensformen schon vor mehr als drei Milliarden Jahren vorhanden gewesen sein müssen. Der Hauptbestandteil des organischen Materials ist das „Kerogen“, dessen komplizierte Polymerstruktur noch nicht aufgeklärt ist.

Additional Material: 16 Ill.

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3-Chlor-1,3,5,2,4,6-thia-dithia(IV)triazin-1,1,3-trioxid (1971)

Roesky, Herbert W.

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971), S. 253-253

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ISSN: 0044-8249

Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

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Darstellung von 1,1-Dimethyl-5-oxo-4,5-dihydro-1,3,2,4,6-thia(VI)-thiatriazin-3,3-dioxid aus S,S-Dimethyl-schwefeldiimid (1971)

Haake, Manfred

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971), S. 256-257

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ISSN: 0044-8249

Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

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URL: http://dx.doi.org/10.1002/ange.19710830711

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Ein neuer Zugang zu Bicyclo[2.1.1]hexen- und Tricyclo[3.1.0.02,6]hexan-Derivaten (1971)

Kirmse, Wolfgang ; Scheidt, Friedrich

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971), S. 251-252

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ISSN: 0044-8249

Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

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Chemie des Lernens (1971)

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971), S. 257-258

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1-Germylallylalkohole und Germacycloalkanole (1971)

Rivière, Pierre ; Satgé, Jacques

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971), S. 286-287

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Isocyanid-Komplexe von Thorium- und UranhalogenidenDiese Arbeit wurde von der Deutschen Forschungsgemeinschaft und dem Fonds der Chemischen Industrie unterstützt. (1971)

Lux, Franz ; Bufe, U.-E.

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971), S. 294-295

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ISSN: 0044-8249

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Photochemische Olefin-Aziridin-CycloadditionDiese Arbeit wurde von der Deutschen Forschungsgemeinschaft und dem Fonds der Chemischen Industrie unterstützt. (1971)

Klaus, Michael ; Prinzbach, Horst

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971), S. 292-293

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ISSN: 0044-8249

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Über Bromierungen in flüssigem Brom (1971)

Stetter (Vortr.), Hermann ; Tresper, Erhard

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971), S. 296-297

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ISSN: 0044-8249

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Source: Wiley InterScience Backfile Collection 1832-2000

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URL: http://dx.doi.org/10.1002/ange.19710830816

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Surfactant Biodegradation, Surfactant Science Series Vol. 3. Von R. D. Swisher. Marcel Dekker, Inc., New York 1970. XXIII, 496 S., geb. $ 33.50 (1971)

Bock, K. J.

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 83 (1971), S. 300-300

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ISSN: 0044-8249

Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

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URL: http://dx.doi.org/10.1002/ange.19710830821

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