Test and simulation study of the effect of transverse impact stress on the rosette 19-hole gun propellant under low temperature

Studying the stress propagation and damage mechanism for the mechanical environment of the gun bore is an important way to popularize and apply the new propellant. Taking rosette 19-hole gun propellant as the research object, transverse drop hammer impact tests for the propellant under low temperature were carried out. Electron microscope tests for the propellant interface were conducted before and after the drop hammer tests. Then, a simulation mechanical model of the propellant was established by using the discrete element method with the rosette shape and 19 inner holes taken into consideration. And a simulation of the transverse drop hammer impact on the propellant was carried out. Research results show that the discrepancy between the simulation and test results of the maximum drop hammer force is 3.16%; the amplitude and pulse width of the drop hammer force-time curves and the fracture damage in the simulation and test studies are also in good agreement. The results reveal that the established simulation model is able to well describe the stress propagation and fracture process of the rosette 19-hole gun propellant under low temperature when affected by transverse drop hammer impact, providing an effective theoretical model basis for studying the damage mechanism of the new propellant.