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Interface crack between two elastic layers

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A semi-infinite interface crack between two infinite isotropic elastic layers under general edge loading conditions is considered. The problem can be solved analytically except for a single real scalar independent of loading, which is then extracted from the numerical solution for one particular loading combination. Two applications of the basic solution are made which illustrate its utility: interface cracking driven by residual stress in a thin film on a substrate, and an analysis of a test specimen proposed recently for measuring interface toughness.


On considère une fissure d'interface semi-infinie entre deux couches infinies élastiques et isotropes soumises à des conditions générales de sollicitations sur leurs bords. Le problème peut être solutionné par voie analytique, à l'exception d'un scalaire réel simple, indépendant de la charge, qui est extrait de la solution numérique relative à une combinaison particulière des sollicitations.

On procède à deux applications de la solution de base qui illustrent son utilité: l'une est relative à une fissure d'interface soumise aux tensions résiduelles dans un film mince déposé sur un substrat. L'autre est l'analyse d'une éprouvette d'essai proposée récemment pour mesurer la ténacité de l'interface.

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Suo, Z., Hutchinson, J.W. Interface crack between two elastic layers. Int J Fract 43, 1–18 (1990).

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