高应变率加载条件下固体材料动态断裂的理论研究

The Theoretical research of dynamic fracture under the condition of high strain rate loading

本文利用—维理想弹塑性流体力学模型，通过数值方法，研究了高功率脉冲强激光辐照固体靶材时，表面烧蚀压在固体靶材中产生的激波的形成、稳定和衰减过程。并分别利用累计损伤判据和动态断裂准则，计算了铝靶中产生的层裂损伤。所得结果与国外有关数值模拟及实测结果较为一致。

A numerical method is presented for study the creation,sustain,and decay processes of laser generated shock wave in the solid target on the basis of one dimensional hydrodynamic model during solid target irradiated by high power pulsed laser beams.By means of accumulating and dynamic damage criterions,the spallation in the aluminum target is calculated.The results in this paper are the same as the dependent numerical simulations and experiments.