Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    Fatigue & fracture of engineering materials & structures 24 (2001), S. 0 
    ISSN: 1460-2695
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A combined analytical and numerical study of an isotropic cracked plate that was repaired by using a bonded composite patch was conducted. The analytical work was based on Rose's equations, whereas for the numerical investigation a three-dimensional finite element analysis was implemented. A number of cracked plates with different crack lengths and overall dimensions of the composite repair were considered. The composite patch was made of unidirectional laminates with different stacking sequences. Both, one- and two-sided patches were analysed. Results are presented for the stress intensity factor in the patched crack and the maximum stress reinforcement stress and adhesive strain. It was found that for the case of a two-sided reinforcement the results obtained by both methods were in good agreement. However, for the case of a single reinforcement the accuracy of the analytical method decreased due to the tendency to out-of-plane bending as a result of bonding a reinforcing patch to only one face of a plate, which is ignored in the analysis.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1436-5057
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Direkte Methoden zur Lösung von singulären Integralgleichungen vom Cauchy-Typus (S. I. G.) beruhen auf der Gaussschen Regel für numerische Integration, wobei die S. I. G. durch Anwendung der resultierenden Funktionalgleichung an geeignet gewählten Kollokationspunkten auf ein lineares Gleichungssystem reduziert wird. In diesem Artikel wurde die Äquivalenz dieser Methode mit derjenigen, welche auf der Lagrangeschen Interpolations-Approximation der unbekannten Funktion, beruht, gezeigt. Indirekte Methoden zur Lösung von S. I. G. können durch Anwendung derselben numerischen Regel an der Fredholmschen Integralgleichung, auf welche die S. I. G. reduziert wird, erhalten werden. In diesem Artikel wurde gezeigt, daß beide Methoden, im Sinne, daß sie dieselben numerischen Resultate liefern, äquivalent sind. Schließlich wurde mit Hilfe dieser Resultate der, Fehler und die Konvergenz der Methoden festgestellt.
    Notes: Abstract Direct methods for solving Cauchy-type singular integral equations (S.I.E.) are based on Gauss numerical integration rule [1] where the S.I.E. is reduced to a linear system of equations by applying the resulting functional equation at properly selected collocation points. The equivalence of this formulation with the one based on the Lagrange interpolatory approximation of the unknown function was shown in the paper. Indirect methods for the solution of S. I. E. may be obtained after a reduction of it to an equivalent Fredholm integral equation and an application of the same numerical technique to the latter. It was shown in this paper that both methods are equivalent in the sense that they give the same numerical results. Using these results the error estimate and the convergence of the methods was established.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Computing 31 (1983), S. 105-114 
    ISSN: 1436-5057
    Keywords: Primary 65D30 ; 65D32 ; secondary 41A55 ; Cauchy-principal values ; finite-part integrals ; convergence ; Jacobi quadratures ; Lagrange polynomials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung In diesem Artikel sind hinreichende Bedingungen, welche die Konvergenz von Quadratursätzen des Elliott-und Hunter-Typus für die Bestimmung von gewichteten Cauchy Hauptwert-Integralen der Form sicherstellen, hergeleitet. Die gleichzeitige Konvergenz beider Quadraturen im Intervall (−1, +1) wurde für eine Klasse von Hölderstetigen Funktionenf(f∈H μ ) nachgewiesen. Im Artikel sind auch Korrekturen von gewissen früheren Darlegungen über die Konvergenz von solchen Quadraturen enthalten. Ferner wurde eine einfache Herleitung der Elliott-und Hunterschen Quadratursätze für die Bestimmung derp-ten Ableitung des obenstehenden Integrals gegeben und hinreichende Bedingungen für die Konvergenz der Hunterschen Quadratur wurden erhalten. Die Konvergenz dieses Integrals wurde somit für Funktionenf, für welchef (p) ∈H μ gilt, sichergestellt.
    Notes: Abstract In this paper sufficient conditions are derived to ensure the convergence of the Elliott and Hunter types of quadrature rules for the evaluation of weighted Cauchy principal-value integrals of the form: The simultaneous convergence in the interval (−1, 1) of both quadratures was established for a class of Hölder-continuous functionsf(f∈H μ ). Corrections of some previous statements on the subject of convergence of such quadratures are also included. Moreover, a simple derivation of the Hunter and Elliott types of quadrature rules for the evaluation of the derivative of thep-th-order of the abovestated integral was given and sufficient conditions for the convergence of the Hunter-type quadrature were obtained. Thus, the convergence of this integral was ensured for functionsf such thatf (p) ∈H μ .
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Singular integral equations with a Cauchy type kernel and a logarithmic weight function can be solved numerically by integrating them by a Gauss-type quadrature rule and, further, by reducing the resulting equation to a linear system by applying this equation at an appropriate number of collocation points x k. Until now these x k have been chosen as roots of special functions. In this paper, an appropriate modification of the original method permits the arbitrary choice of x k without any loss in the accuracy. The performance of the method is examined by applying it to a numerical example and a plane crack problem.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Computational mechanics 23 (1999), S. 519-523 
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary A method for accelerating the convergence of the numerical solution of a singular integral equation, based on Padé Approximants, is given in this paper. At first the general form of the Padé Table and of the “epsilon” algorithm are presented. Taking into consideration the classical quadrature method, based on the Gauss-Jacobi quadrature rule, an approximate formula is derived for the unknown density function of the Cauchy-type singular integral equation or of the equivalent Fredholm integral equation. In this formula applying the “epsilon” algorithm to the solution for the stress intensity factors, the convergence is achieved after a few operations. The number of numerical operations required for the determination of stress intensity factors is considerable reduced, when compared to the number of operations required for a classical type of solution. Illustrative examples are given, indicating the efficiency of the method.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Computational mechanics 4 (1988), S. 137-148 
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In this paper, a set of polynomials {ϕ n (x;ζ)} orthogonal with respect to w(x)/(x − ζ) is obtained. (w(x) being a weight function.) Using these polynomials a Gauss formula for the numerical integration of the Cauchy type integrals $$I(f;\xi ) = \mathop {\rlap{--} \smallint }\limits_a^b \frac{{w(x)f(x)}}{{x - \xi }}{\text{d}}x$$ is for the first time constructed. The proof follows the same lines as the proof of the classical Gauss integration for the Riemann integrals. The proposed quadrature formula is very interesting in many problems of mathematical physics, mechanics etc. The new formula presents the expected polynomial accuracy and it is succesfully tested in three numerical examples.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Archive of applied mechanics 53 (1983), S. 225-241 
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Übersicht Komplexe Potentiale Φ(z) und Ψ(z) werden berechnet. Sie beschreiben das Intensitätsfeld, das von einer Einzelkraft oder von einer Versetzung hervorgerufem wird. Diese Potentiale werden angewandtauf einige Punkte innerhalb jeder der Halbebenen, die auf verschiedene Art und Weise miteinander verbunden sein können. Bei Verwendung dieser Potentiale in Form von Greenschen Funktionen haben wir das Problem der Risse und/oder der Löcher, die in jeder Halbebene enthalten sind, auf eine Integralgleichung für diese Risse oder Löcher reduziert. Der Vorteil dieser Methode ist der, daß dabei die Integralgleichung, angewandt auf die Grenzfläche zwischen den beiden Halbebenen (y = 0), überflüssig wird. Somit wird die numerische Berechnung des Intensitätszustandes weitgehend vereinfacht. Es wurden die betreffenden Integralgleichungen hergeleitet, die einigen charakteristischen Fällen von zweimaterialigen Platten entsprechen. Die Beispiele von rißenthaltenden Halbebenen, jede von ihnen intensitäts- oder versetzungsfrei oder verbunden mit anderen Halbebenen, zeigen die Leistungsfähigkeit dieser Methode.
    Notes: Summary The complex potentials Φ(z) and Ψ(z) describing the stress-field due to a concentrated force, or a dislocation, applied at some point at the interior of either of the half planes bonded together, or being under some kind of contact between them, are calculated. By using these potentials as Green's functions we have reduced the problem of crack and/or holes existing in either of these half-planes to an integral equation along the cracks or holes. The advantage of the method is that the integral equation along the interface between the two half-planes (y=0) is canceled out. Thus, the numerical evaluation of the state of stress is considerably reduced and simplified. The respective integral equations corresponding to some characteristic cases of bimaterial plates were derived. Finally, examples of cracked half-planes, either stressor displacement-free, or bonded with other half-planes, indicated the potentialities of the method.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Archive of applied mechanics 66 (1996), S. 434-446 
    ISSN: 1432-0681
    Keywords: Key words: crack ; microcrack ; integral ; equation ; iteration.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary The exact solution of the problem of a dislocation interacting with a crack has been used for the generation of integral equations on the microcracks only. A few discretisation points are needed along the microcracks, due to their small length. The solution of the resulting system of linear algebraic equations is effected via iterations for the time of computations to be further reduced. In several cases our results seem to be more accurate than the ones obtained in [3].
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Archive of applied mechanics 66 (1996), S. 434-446 
    ISSN: 1432-0681
    Keywords: crack ; microcrack ; integral equation ; iteration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary The exact solution of the problem of a dislocation interacting with a crack has been used for the generation of integral equations on the microcracks only. A few discresation points are needed along the microcracks, due to their small length. The solution of the resulting system of linear algebraic equations is effected via interations for the time of computations to be further reduced. In several cases our results seem to be more accurate than the ones obtained in [3].
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Archive of applied mechanics 52 (1982), S. 159-166 
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Übersicht Das Konzept wegunabhängiger Integrale, welches für homogene Medien früher eingeführt wurde, wird für den Fall eines Risses in einer Grenzfläche zwischen zwei verschiedenen Halbebenen erweitert. Durch Verwendung eines der in dieser Arbeit definierten wegunabhängigen Integrale erhalten wir den Spannungsintensitätsfaktor, wenn die Eißlippen durch an beiden Lippen identisch verteilter Spannungen oder Einzelkräfte oder Momente belastet werden. Die oben genannten Integrale sind erweitert, um den Fall einer willkürlichen Zahl von kollinearen Bissen in der Grenzfläche der Halbebenen einzuschließen. Der Fall von periodischen Rissen kann aus dieser Analysis erhalten werden. Schließlich kann eine interessante Verallgemeinerung für den Fall erhalten werden, daß willkürliche Risse, Einschlüsse oder nicht unbedingt an den Rißlippen wirkende Einzelkräfte und Momente in Wechselwirkung stehen.
    Notes: Summary The concept of path independent integrals introduced previously for homogeneous media is extended to the case of a crack in the interface between dissimilar half planes. Using any of the pathindependent integrals defined in this paper we obtain the stress intensity factor when the lips of the crack are loaded by identical distributions of stresses in both lips, or by concentrated forces or couples. The above integrals are extended in order to include the case of an arbitrary number of collinear cracks in the interface of two half planes. The case of periodic cracks may be derived from the above analysis. Finally, an interesting generalization may be obtained for the case where arbitrary cracks, inclusions or concentrated forces and couples, not necessarily applied at the lips of the crack, interact.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...