PERIDYNAMIC SIMULATION OF THERMAL RESPONSE OF HMX-BASED ALUMINIZED EXPLOSIVE

Peridynamic method has performed brilliant application prospects in many fields, especially the crack propagation and thermal-mechanical coupling problems. In this paper, a thermal peridynamic simulation with McGuire-Tarver reaction kinetics model in the heat source is conducted for revealing the thermal response of energetic materials. This model takes account of multi-steps chemical reaction during the heating process and is appropriate for the crack condition. Herein, cook-off test simulation of octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX)based aluminized explosive is carried out. Simulation results exhibit satisfactory accuracy compared with the previous experiments. The influence of heating rates and explosive component ratios on thermal response are also employed. The results show that heating rate plays an important rule on ignition time and position. The additions of HMX and ammonium perchlorate are likely to trigger more violent exothermic chemical reaction during the ignition process. Particularly, cook-off model of warhead with crack is built and calculated. The results indicate that crack may lead to thermal accumulation and reaction aggravation of the explosive.