Numerical simulation of ignition of explosives in spigot test

To investigate the ignition mechanism of explosives under impact, the node tie-breaking method combined with the thermo-elastic-plastic material constitution and chemical kinetics equations was used to simulate ignition for explosives of PBX-2. The influence of mesh size on the explosive's temperature rising was discussed. The explosive's mechanical damage image in the spigot test and local temperature rising curve were obtained. The critical drop velocity of ignition was calculated. The results are consistent with the experiment data better. It indicates that the approach can effectively describe the explosive's damage and ignition reaction under thermal-mechanical-chemical coupled effect.