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  • 1
    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 The dynamic analysis of composite shell structures is carried out by an explicit finite element code employing 4-node one-point quadrature elements. The anisotropic Hoffman yield criterion is adopted to model the laminates. The formulation for stress update using a backward Euler scheme is presented in the plane stress subspace. Several numerical examples are presented. The issue of implementing single-iteration schemes for stress update is also investigated.
    Type of Medium: Electronic Resource
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  • 2
    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  The dynamic analysis of composite shell structures is carried out by an explicit finite element code employing 4-node one-point quadrature elements. The anisotropic Hoffman yield criterion is adopted to model the laminates. The formulation for stress update using a backward Euler scheme is presented in the plane stress subspace. Several numerical examples are presented. The issue of implementing single-iteration schemes for stress update is also investigated.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    International journal of fracture 13 (1977), S. 821-837 
    ISSN: 1573-2673
    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: Résumé Des développements récents dans les techniques numériques pour l'analyse des contraintes dynamiques transitoires ont permis d'utiliser à présent des modèles réalistes dans les études de propagation des fissures. Dans ce mémoire, on envisage des solutions par éléments finis pour les transitoires dynamiques dans les cas de la poutre double cantilever et de problèmes de pipelines où l'on autorise la propagation d'une fissure. On recourt aux éléments paramétriques paraboliques standards pour réaliser une division discrète de l'espace, et l'on utilise pour l'intégration dans le temps un schéma explicite à différence centrale. On considére à la fois les critères de contraintes critiques et d'équilibre d'énergie lors de la propagation de la fissure. Le problème du pipeline pressurisé est solutionné en considérant ce dernier comme un solide tridimensionnel. En premier lieu, on considère une fissure stationnaire et l'on tient compte des effets des grandes déformations et de la plasticité. On met ensuite en équation le cas transitoire d'une fissure en propagation dynamique, en utilisant un critère de contrainte et un critère d'énergie. Ce cas permit d'envisager le comportement sous des déformations élastiques importantes.
    Notes: Abstract Recent developments in numerical techniques for dynamic transient stress analysis have ensured that realistic models can now be employed in crack propagation studies. In this paper transient dynamic finite element solutions are undertaken for both double cantilever beam (DCB) and pipeline problems with propagation of the crack being permitted. Standard parabolic isoparametric elements are employed for spatial discretization with an explicit (central difference) scheme being employed for time integration. Both critical stress and energy balance crack propagation criteria are considered. The pressurised pipeline problem is solved for as a fully three-dimensional solid. Firstly, a stationary crack is considered and both large deformations and plasticity effects are accounted for. The transient case of a dynamically propagating crack is then modelled, employing both a stress and energy criterion. Elastic large deformation behaviour is permitted for this case.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 11 (1976), S. 587-589 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    International journal of fracture 9 (1973), S. 471-476 
    ISSN: 1573-2673
    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: Résumé Un programme d'analyse des contraintes par éléments finis a été utilisé pour connaître les valeurs du facteur d'intensité des contraintes K 1 dans le cas de fissures radiales à la périphérie d'un trou dans une plaque de dimensions finies soumise à traction. On a examiné diverses valeurs du rapport du rayon de courbure du trou sur la largeur de la plaque; pour les grandes largeurs de plaque, on a comparé les résultats obtenus avec ceux fournis par la solution de Bowie pour une plaque infinie. On a procédé également au calcul du facteur d'intensité de contraintes dans le cas d'un disque en rotation comportant un alésage simple ou un alésage avec rainure de cale dont le facteur de concentration des contraintes est de 3,7. On a mesuré les contributions individuelles qu'apportent à K 1 les tensions centrifuges et les forces tangentielles agissant sur des aubes à périphérie du disque. Les résultats obtenus sont comparés avec ceux auxquels conduisent les méthodes approchées établies par Williams et Isherwood.
    Abstract: Zusammenfassung Ein finites Verfahren zur Untersuchung der Spannungen wurde angewandt um Werte des Spannungsintensitätsfaktors K 1 für radiale Risse am Rande eines Loches, in einer endlichen Platte unter Zugspannung, zu ermitteln. Verschiedene Werte des Verhältnisses des Radius des Loches zur Breite der Platte wurden untersucht und für die großen Breiten der Platte wurden die Ergebnisse mit denen des Verfahrens von Bowie verglichen. Die Berechnung wurde auch für eine drehende Scheibe mit einer einfachen Bohrung und einer Bohrung mit Nute mit einem Kerbwirkungsfaktor von 3,7 ausgeführt. Der Anteil zu K 1 der Centrifugalkräfte und der Schaufelkräfte die am Rande angreifen, wurden einzeln gemessen und die Ergebnisse wurden mit der annähernden Methode von Williams und Isherwood verglichen.
    Notes: Abstract A finite element stress analysis program has been used to find values of the stress intensity factor, K 1, for radial cracks at the boundary of a hole in a finite plate under tension. Several values of the plate width ratio were investigated and for large values of the plate width the results were compared to the infinite plate solution of Bowie [1]. Computations were also made for a spinning disc, both with a smooth bore and with a bore containing a keyway having a stress concentration factor of 3.7: the separate contributions to K 1 of the rotational stresses and of blade forces acting on the rim were measured and the results compared with the approximate methods suggested by Williams and Isherwood [2].
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 8 (1973), S. 1136-1144 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper represents a first attempt to discuss the growth of groups of cavities in an isotropic polystyrene-like solid. Calculations are made on a two-dimensional array of cylindrical voids in a sheet of uniform thickness. Stresses and displacements throughout the solid are obtained by use of the finite element method for both uniaxial and biaxial loading conditions. Elastic perfectly-plastic and strain-softening-hardening material laws are considered. It is shown how groups of voids are much more easily formed than single separate voids. For a strain-softening-hardening constitutive law a craze formation mechanism is proposed and its stability examined.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 3 (1971), S. 591-591 
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 8 (1974), S. 277-288 
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: It is shown how the stress field due to any prescribed continuous distribution of dislocation dipoles can be determined. This technique then forms the basis of a general method of solution of elasto-plastic material problems. The presentation is limited to situations which conform to either plane stress or strain conditions. Some results are obtained for relatively simple geometrical and loading configurations and compared with classical plasticity solutions. Finally, the method is applied to the problem of a circular hole in a finite strip under tension.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 15 (1980), S. 1421-1421 
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 22 (1986), S. 189-208 
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: This paper considers a layered thick shell finite element procedure for determining the dynamic transient nonlinear response of plates and shells. The degenerated three-dimensional isoparametric shell element with independent rotational and translational degrees-of-freedom is employed and a layered formulation is adopted to represent the steel reinforcement and to simulate progressive concrete cracking through the thickness. The dynamic yielding function is assumed to be a function of the current strain rate, in addition to being total plastic strain or work dependent. The concrete model also simulates both compressive crushing and tensile cracking behaviours and an implicit Newmark algorithm is employed for time integration of the equations of motion. Several numerical examples are presented for both slab and shell structures and the results obtained compared with those from other sources wherever available.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
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