Numerical simulation study of composite solid propellant small scale gap test

The small scale gap test is a very important method to study the sensitivity characteristics of a composite solid propellant under shock waves. In this paper, the small scale gap test is taken as the research object. The theoretical model of shock wave conduction in the small scale gap test is established. The detonation parameters of mixed explosives and the shock wave incident parameters of propellants corresponding to different sizes of inert barriers are calculated. The reliability of the method is verified by classical examples. A numerical model is established for the small scale gap test, and the critical thickness of the partition plate is obtained with a 50% probability of initiation. The results can predict the development and safe use of a high-energy composite solid propellant and provide theoretical support for the establishment of safety standards of high-energy composite solid propellants.