Caustics investigation of interfacial fracture in orthotropic/isotropic bi-material system

The crack tip stress intensity factor in a homogeneous isotropic material was easily experimentally evaluated via the caustics method. With respect to the bi-material orthotropic/isotropic system, it is not possible to directly evaluate the interfacial crack stress intensity factor via traditional caustics theory. In the study, theoretical caustics and initial curves at interfacial cracks of orthotropic/isotropic bi-material system were...