Numerical simulation of collapse damage of rear surface of concrete target under internal explosion

The collapse damage of the rear surface of concrete target due to internal explosion is simulated by using the LS-DYNA finite element code. According to the different loading conditions of concrete, the different simulation methods are adopted. The Euler grid and the Grüneisen equation of state are used to describe the collapse of concrete medium under high pressure, and the Lagrange grid and the continuum damage model are used to describe its collapse under middle or low pressure. The numerical results show that the improved numerical simulation method is available, and the critical collapse thickness and its limit value of the rear surface of concrete target can be obtained.