Abstract
Determination of the configuration and size of fracture process zone (FPZ) at dynamic crack tip is still a problem unsolved completely at present. In this paper, based on elastic dynamic theory and stress functions, a method for evaluating the configuration and the size of FPZ is proposed and the feasibility of the method is demonstrated. The configuration and size of the FPZ near the crack tip in dependence on crack propagation velocity are determined by using the Von Mises and Tresca criteria, respectively. Numerical results show that FPZ at mode II and mode III dynamic crack tip is distributed symmetrically with respect to crack plane and increases with the crack propagation velocity. FPZ changes more rapidly when the Rayleigh wave velocity is approached. The effects of Poisson’s ratio on FPZ are discussed. Analysis reveals an intricate dependence on Poisson’s ratio in plane strain condition.
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