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  • 1
    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: Both experimental and analytical investigations were conducted to study crack initiation and growth of small cracks, near-threshold growth behavior of large cracks at constant R-ratio/decreasing ΔK and constant Kmax/decreasing ΔK, respectively, for 9310 steel. The results showed that a pronounced small-crack effect was not observed even at R = −1, small cracks initiated by a slip mechanism at strong slip sites. Worst-case near-threshold testing results for large cracks under several Kmax values showed that an effect of Kmax on the near-threshold behavior does not exist in the present investigation. A worst-case near-threshold test for a large crack, i.e. constant Kmax/decreasing ΔK test, can give a conservative prediction of growth behavior of naturally initiated small cracks. Using the worst-case near-threshold data for a large crack and crack-tip constraint factor equations defined in the paper, Newman's total fatigue-life prediction method was improved. The fatigue lives predicted by the improved method were in reasonable agreement with the experiments. A three-dimensional (3D) weight function method was used to calculate stress-intensity factors for a surface crack at a notch of the present SENT specimen (with r/w = 1/8) by using a finite-element reference solution. The results were verified by limited finite-element solutions, and agreed well with those calculated by Newman's stress-intensity factor equations when the stress concentration factor of the present specimen was used in the equations.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Computational mechanics 4 (1989), S. 429-432 
    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 principles of reversible thermodynamics can be used to place constraints on the form of the constitutive law in thermoelastic problems. The constraints indicate that the use of stress-rates can lead to complications in the form of the constitutive law that are removed when rates are not employed. In fact, in a large rotation small strain thermoelastic problem the stress can be written directly in terms of the symmetric part of the deformation gradient, and the temperature. The rotation at each point can be removed by the solution of an eigenvalue problem. For the large rotation large strain inelastic problem with varying temperatures, the work presented in this paper can be further developed for determining thermodynamically consistent constitutive models.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    International journal of fracture 36 (1988), S. 35-53 
    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 On résume le développement de la méthode de l'intégrale de surface et des éléments finis hybrides pour l'analyse de la mécanique de rupture à deux et à trois dimensions. La rupture, considérée comme une discontinuité dans un champ de déplacement, est représentée de manière explicite et avec efficience en recourant aux dislocations dans le cas de l'analyse à deux dimensions, et aux dipoles de forces ponctuelles dans le cas des applications à trois dimensions. Le problème de la valeur aux limites d'une rupture dans un domaine fini est solutionné par la superposition par incréments d'un modèle à éléments finis d'un corps fini dépourvu de fissures et d'un modèle en intégrale de surface d'un corps infini pourvu d'une fissure, en s'assurant que les conditions appropriées de traction et de déplacement s'accordent aux limites. On utilise également les éléments finis pour représenter une non homogénité ou de la plasticité, bien que des kernels isotropes soient employés pour l'équation intégrale. On a représenté divers problèmes à deux et à trois dimensions et on a obtenu un excellent accord avec les solutions analytiques. Les problèmes de propagation en deux dimensions ont également été modélisés, et ces résultats prévus sont en excellent accord avec les observations expérimentales.
    Notes: Abstract This paper summarizes the development of the surface integral and finite element hybrid method for two and three dimensional fracture mechanics analysis. The fracture, which is a discontinuity in the displacement field, is modeled explicitly and efficiently by use of dislocations for two dimensional analysis and by dipoles of point forces for three dimensional applications. The boundary value problem of a fracture in a finite domain is solved by (incremental) superposition of a finite element model of the finite body without the crack and a surface integral model of an infinite body with the crack, ensuring proper traction and displacement matching at the boundaries. Finite elements are also used to model nonhomogeneity and plasticity, though isotropic kernels are used for the integral equation. A variety of two and three dimensional problems have been modeled and excellent agreement with analytical solutions has been obtained. Propagation problems in two dimensions have also been modeled and the predicted results agree very well with experimental observations.
    Type of Medium: Electronic Resource
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