Evaluation of Static and Dynamic Fracture Parameters along the Interface of Isotropic-Orthotropic Bimaterial

摘要

Bi-material interfacial fracture has received considerable attention from various researchers in recent times. Most of these investigations are on either static or dynamic fracture of interfaces between dissimilar but isotropic materials. Gdouts and Papakaliatakis and Lu and Chang have obtained the stress intensity factors (SIF) for interfacial cracks subjected to static loading using photoelasticity. The fracture parameters for cracks propagating along the interface between dissimilar isotropic materials have been obtained by Lambros and Rosakis and Kavaturu and Shukla [4], for the subsonic and intersonic regime of crack speeds. However, the fracture, both static and dynamic, of interfaces between an isotropic and orthotropic material has not received much attention. Cho et. al, [5] have obtained the SIF for a central interfacial crack between an isotropic and orthotropic half plane using boundary element method. Most of the investigations are analytical or numerical in nature and experimental studies in this area are not reported yet. Orthotropic materials such as fiber-reinforced composites are being extensively used along with conventional isotropic materials and many times the two are bonded together. Understanding the failure of such interfaces is critical to the successful performance of these structural components.