Full field analysis of an anti-plane interface crack subjected to dynamic body forces

In this study\ the transient full _eld response of an interface crack between two di}erent media subjected to dynamic body force at one material is investigated[ For time t 9\ the bimaterial medium is stress free and at rest[ At t 9\ a concentrated anti!plane dynamic point loading is applied at the medium as shown in Fig[ 0[ The total wave _eld is due to the e}ect of this point loading and the scattering of the incident waves by the interface crack[ An alternative methodology that is di}erent from the conventional superposition method is used to construct the re~ected\ refracted and di}racted wave _elds[ A useful fundamental solution is proposed in this study and the full _eld solution is determined by superposition of the fundamental solution in the Laplace transform domain[ The proposed fundamental problem is the problem of applying an exponentially distributed traction "in the Laplace transform domain# on the interfacial crack faces[ The Cagniard de Hoop method of Laplace inversion is used to obtain the transient solution in time domain[ Exact transient closed form solutions for stresses and stress intensity factors are obtained[ Numerical results for the time history of stresses and stress intensity factors during the transient process are discussed in detail[ 0887 Elsevier Science Ltd[ All rights reserved