RESEARCH ON THE DYNAMIC FRACTURE BEHAVIOR OF FUNCTIONALLY GRADED MATERIAL WITH PERIODIC INTERFACE CRACKS

摘要

In this paper, the periodic interface dynamic cracks problem in functionally graded material is studied under impact loads. By using Fourier and Laplace integral transform techniques, the governing equation in Laplace domain are obtained. Introducing dislocation density function, the solution of boundary value problem is converted into a singular integral equation with Hilbert-type singular kernel by using boundary conditions. The resulting singular integral equation is solved numerically and the periodic cracks tip field is examined. Numerical results are figured out to show the effects of crack spacing, geometrical parameters and the material non-homogeneity on the stress intensity factors.