Crack propagation simulation based on extended finite element method

Crack propagation of drill pipe is a typical discontinuous problem,which is difficult to be simulated with traditional finite element method.In order to solve the defects of traditional methods,XFEM introduced level set function method to describe crack shape so as to realize initiation and development of crack in the inner unit.The problem of crack propagation simulation in traditional method relying on the life and death of element was then solved.Crack problem of a finite flat which was in the classical solution of the elasticity was simulated by ABAQUS using the XFEM method.The validity of the XFEM method was proved.At the same time,the crack propagation in three point bending beam was simulated.The results show that the extended finite element method can effectively simulate the process of the cracking;simulation of the crack propagation is realistic is free from the constraints of the cell boundary and will not increase the elements.The amount of elements is effectively reduced.The cost of computing is decreased and convenient way is provided to solve real complex problems.2 tabs,9 figs,11 refs.