Study on detonation performance of insensitive explosives under shock-release-reshock condition

In some special engineering applications and accidents, explosives may be subjected to multiple shocks and releases, resulting in changes in their detonation response, thereby affecting the stability and reliability of the explosive devices. To analyze more details about the shock-to-detonation transition (SDT) of explosives under the complex loading, the shock-release-reshock experiments on the insensitive explosive 1,3,5-triamino-2,4,6-trinitrobenzene were conducted on the functionally graded material flyer. Based on the user subroutine, the finite element program of Chemical Reaction Equation of State and Rate Model on LS-DYNA was developed. The complete SDT process of the explosive was obtained by combining the experimental and numerical simulation results, and the detonation performance of the explosive under shock-release-reshock condition was analyzed. The results indicate that the explosives have an initial shock desensitization, and the release process leads to a competitive mechanism between shock desensitization and shock sensitization in explosives. Differences in the release state affect the macroscopic detonation performance of explosives.