Crack-tip fields for cracks perpendicular to the interface between dissimilar elastic and creeping materials

摘要

The stress fields at the tip of a crack terminating at and perpendicular to the interface under symmetric in-plane loading are investigated. ^The bimaterial interface is formed by a linearly elastic material and an elastic power-law creeping material. ^Using generalized expansions at the crack tip in each region and matching across the interface, a series asymptotic solution is constructed for the stresses and strain rates near the crack tip. ^It is found that the leading-order stress singularities are the same in each material, oscillatory higher-order terms exist in both regions, and a stress higher-order term appears in the elastic material. ^The stress exponents and the angular distributions for singular terms and higher-order terms are obtained for different hardening exponents. ^A full agreement between asymptotic solutions and the full-field finite element solutions was obtained. ^(Author)