Numerical modelling of underwater structural impact damage problems based on the material point method

摘要

Based on the material point method (MPM), the numerical modelling of the steel plate structure under the near-field contact explosion in underwater was studied. The equations of state, constitutive equation and failure mode are used to analyse the destruction and failure process of materials. Numerical studies analyse the impact of explosive loads on underwater steel plates under different operating conditions and calculate the distribution of pressure and particles. The results show that the steel plate will produce a large plastic deformation and eventually form a punch inge, and the existence of steel plate medium has obviously helped the whole system to weaken the shock wave, which can reduce the damage by about 20%. It can serve as a useful reference for the protection of underwater systems.