Dynamics;  cohesion zone model;  finite elements;  fracture;  Numerical simulation

In order to simulate the fracture failure of concrete simple supported beams under dynamic load, the program code for dynamic analysis of simple supported beams was compiled by using the principle of dynamic virtual work, time step, bilinear cohesion zone model, and conventional finite element cohesion zone model. With the help of the powerful pre- and post-processing functions of the commercial software ABAQUS, the size of the verification cohesion unit should be controlled within one-half of the length of the cohesion area. In the initial stage after crack cracking, the crack propagation rate is slower, and then it propagates upward at a steady speed. The example shows that the method combining conventional finite element and cohesion zone model has broad application prospects in simulating the naturally occurring fracture process of cracks.