Collinear cracks in a layered half-plane with a graded nonhomogeneous interfacial zone—Part II: Thermal shock response

摘要

In Part I of the paper, the problem of collinearcracks in a layered half-plane with a graded nonhomogeneousinterfacial zone was investigated under mechanical loading andthe cracking behavior was addressed by evaluating the stressintensity factors as functions of various geometric and materialparameters. In Part II, the solution framework is extended to theproblem of thermal shock on the basis of uncoupled, quasi-staticthermoelasticity. The interfacial zone, in this case, is assumed tohave the graded thermoelastic properties. Using the principle ofsuperposition, a system of singular integral equations is solvedsubjected to equivalent crack surface tractions obtained from thetransient thermoelasticity solution for a uncracked medium. Mainresults presented are the transient thermal stress intensity factorsof collinear cracks to illustrate the parametric effects ofgeometric and material combinations of the layered medium withthe thermoelastically graded interfacial zone.