Dynamic Fracture Near the Crack Tip

Abstract

It is well known that when formulating the macrorupture criterion, complementing the solid-medium mechanics equations, one has to take into account the most important peculiarity of dynamic fracture — the existence of not only a spatial but also a temporal structure of the process. This circumstance must be reflected while choosing criterion-determining parameters and test methods of dynamic strength properties of a material. Structural—temporal criteria, already considered in the previous chapters, permit taking this dynamic fracture peculiarity into account and modeling the process of crack-growth initiation under the action of impact pulses.

In this chapter we examine some principal peculiarities, and present calculation methods and an interpretation of the well-known high-rate fracture effects of elastic bodies with cracks [23-29, 31, 49, 99].