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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    International journal of fracture 13 (1977), S. 409-430 
    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 Le mémoire présente une nouvelle méthode pour vérifier la résistance résiduelle de composants structuraux ayant subi un dommage suite à un impact pénétrant. La méthode est basée sur l'application de la fonction de densité de probabilité de Weibull, pour tenir compte de la dispersion appréciable de résistances résiduelles, qui découle de la nature statistique du dommage par impact (fissure, trous et écaillages en surface). Pour mesurer l'étendue d'une configuration d'un dommage par impact, on présente un nouveau paramètre basé sur la solution applicable à une fissure inclinée dans un champ de tension uniaxial, et basé sur un critère de rupture obtenu par voie expérimentale, pour des configurations de fissure de mode mixte. Les résultats des essais sont présentés pour des résistances résiduelles d'éprouvettes endommagées et usinées afin de vérifier la nature statistique qui caractérise un détail d'endommagement extérieur, un trou à paroi lisse et une fissure aigüe. Enfin, des courbes de probabilité de rupture sont fournies pour des panneaux d'aluminium 7075-TG soumis à tension uniaxiale et comportant à la fois un endommagement par usinage et par impact.
    Notes: Abstract This paper presents a new method for assessing the residual strength of structural components which have sustained impact penetration damage. The method is based upon the application of the Weibull probability density function to account for the significant scatter in residual strengths which result from the random nature of impact damage detail (cracks, holes, and spall surfaces). To measure the extent of an impact damage pattern, a new parameter is presented which is based upon the solution for an inclined crack in a uniaxial tension field and an experimentally obtained fracture criterion for mixed mode crack configurations. Test results are presented for residual strengths of machined damage specimens to ascertain the statistical nature which arises from extreme damage detail, smooth holes and sharp cracks. Finally, probability of failure curves are given for both machined (7075-T6) and impact damage (7075-T6 and 2024-T81) in aluminum uniaxial tension panels.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 12 (1978), S. 59-65 
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: This note presents the closed form equations for the stiffness terms in the elastic-plastic stiffness matrix for axisymmetric finite elements. The element considered is a triangular ring element characterized by linear displacement relationships and an averaged state of stress. The physical law is modelled by the incremental theory of plasticity utilizing the Prandtl-Reuss flow rule and von-Mises Yield Criterion. Results are presented comparing stiffness terms as computed by numerical integration to those computed from the closed form equations. Significant errors in stiffness terms arising from numerical integration are observed for axisymmetric elements located near the line of axial symmetry as a result of the logarithmic nature of some of the stiffness terms.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    International journal of fracture 18 (1982), S. 253-277 
    ISSN: 1573-2673
    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 explores the statistical nature of the mechanisms of fracture in structural materials and the loads that initiate them. The result of employing either a weak link or bundle model in the application of statistics to problems of fracture is examined. Experimental data is presented for the fracture of metal chains and the fracture of sheet aluminum containing machined cut-outs and cracks. The scatter in fracture loads for the chains and fracture toughness for the sheet specimens is statistically analyzed utilizing four statistical distributions: normal, lognormal, extreme value, and two-parameter Weibull functions. Based upon this work there appears to be no general a priori justification to utilize either the weak link or the bundle model in the statistical assessment of the fracture of typical engineering structural components.
    Type of Medium: Electronic Resource
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