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

• Published in: FirePhysChem (Online) 2022-06, Vol.2 (2), p.147-153
• Main Authors: Zhang, Ruihua, Liu, Jihua, He, Changhui, Zhao, Hongli, Wang, Qionglin
• Format: Article
• Language: English
• Subjects: Discrete element method; Drop hammer impact test; Fracture damage; Rosette 19-hole gun propellant; Stress propagation
• ISSN: 2667-1344; 2667-1344
• DOI: 10.1016/j.fpc.2021.09.004

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. An experimental and simulation study of the transverse drop hammer impact on the rosette 19-hole gun propellant under low temperature (-40 °C) are conducted. The drop hammer test results show high repeatability. The impact mechanics model considering the rosette shape and 19 inner holes of the propellant is established through DEM. The stress propagation and fracture process of the propellant under transverse drop hammer impact are obtained through simulations. The discrepancy between the simulation and experimental results is 3.16%, and the fracture performances are similar. The correctness and rationality of the simulation model are verified by test. Research results can serve as a powerful approach to study the dynamic mechanical properties of propellant charge under the mechanical environment of a gun bore. [Display omitted]