Observations on high strain rate crack growth based on a strip yield model

摘要: In the past, analytical models have been developed for study of rapid crack growth in a rate-dependent elastic-plastic material under conditions that permit advance cleavage mode, and separately an when advances by means local ductile mechanism. However, suitable mode advance, with operative being determined which two competing fracture criteria prevails, elusive. Here, process dynamic tensile is studied small scale yielding tip plastic zone modeled as strip yield extending ahead advancing tip. Following Glennie [1] others, rate dependence flow taken into account assuming cohesive stress depends linearly on opening zone. The can steadily according to either are considered. A criterion identified locally critical condition mode. analysis leads among applied intensity factor, speed viscosity necessary sustained case, implication easiest satisfy will establish advances.