This page presents the simulation of a propagating crack on the welded T-joint shown below. Details of the Generalized Finite Element Method used in the computations can be found in the paper
C. A. Duarte, O. N. Hamzeh, T. J. Liszka, and W. W. Tworzydlo. A generalized finite element method for the simulation of three-dimensional dynamic crack propagation. Computer Methods in Applied Mechanics and Engineering, 190:2227–2262, 2001.