Dynamic Failure Mechanics Investigation on the Advanced Materials with Interfaces

Abstract

Fracture and failure mechanics of advanced materials and structures with interfaces was investigated both experimentally and numerically. Dynamic fracture mechanics was used to model the phenomena when a main crack was encountering an interface. Critical dynamic fracture mechanics parameters of an infinitesimal kinked crack were determined through a relation of crack speeds, kinked angles and the other parameters of the main incident crack. Strength-based criteria were proposed to predict the interfacial debonding ahead of a main crack. In these studies, interface strengths were found to be crucial parameters for predicting crack propagation along the interface. Hence, a new specimen design to measure intrinsic interface strengths of dissimilar materials was performed, and accurate interfacial strengths were obtained.