过载环境下炸药装药点火过程的数值模拟

To reveal the ignition mechanism of explosive charge under overload conditions, based on the anti-overload performance evaluation device, the viscoelastic statistical crack mechanics (Visco-SCRAM) model was used to describe the mechanical and thermal behavior of explosive. The Visco-SCRAM model was embedded into LS-DYNA in the way of secondary development. The response process of explosives under overload conditions was calculated by LS-DYNA. The DNAN-based melt cast explosive (RBHL-1) was tested by the anti-overload performance evaluation device. The results show that the threshold velocity of the hammer is 9.0-9.5m/s. When the speed of the hammer exceeds the threshold velocity, the upper surface of the explosive will ignite. The ignition position locates on the upper surface of the explosive charge, and the threshold velocity of the hammer is 9.26m/s. The comparison between numerical simulation and experimental results shows that the Visco-SCRAM model can accurately predict the ignition position and threshold velocity, indicating that shear friction is the ignition mechanism of explosives in the anti-overload performance evaluation test. Meanwhile, enhancing the quality of explosive charge and the protection ability of energetic materials in explosives are effective means to improve the anti-overload performance of explosives.