FULL-FIELD ANALYSIS OF AN ANTIPLANE INTERFACE CRACK SUBJECTED TO DYNAMIC BODY FORCES

In this study, the transient full held response of an interface crack between two different media subjected to dynamic body force at one mat erial is investigated. For time t < 0, the bimaterial medium is stress free and at rest. At t = 0, a concentrated anti-plane dynamic point l oading is applied at the medium as shown in Fig. 1. The total wave fie ld is due to the effect of this point loading and the scattering of th e incident waves by the interface crack. An alternative methodology th at is; different from the conventional superposition method is used to construct the reflected, refracted and diffracted wave fields. A usef ul fundamental solution is proposed in this study and the full field s olution 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 Lapl ace transform domain) on the interfacial crack faces. The Cagniard-de Hoop method of Laplace inversion is used to obtain the transient solut ion 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 trans ient process are discussed in detail. (C) 1998 Elsevier Science Ltd. A ll rights reserved.