Fracture Mechanics Characterization of Crack Arrest and Reinitiation in Two Unconventional Specimens

摘要

A simple elastic-plastic-fracture-mechanics-based model of crack propagation, arrest, re-initiation, and propagation is described. This model requires much less computing resources than dynamic, elastic-plastic finite element calculations, and allows estimates of applied J-integral, load, and crack mouth opening displacement during initial rapid crack propagation, re-initiation and repropagation. A comparison of this new model to other available models and to experimental results indicates that it can successfully reproduce the essential features of the behavior of specimens containing propagating cracks.