Response Of Lightweight Casings During Launch Dynamic

Lightweight is bullets’ future development trend. The research of this paper is based on a lightweight project about machine gun bullets. The dynamic response of cartridge is analyzed combined with theoretical and finite element analysis for aluminum alloy cartridges are often being damaged while doing experiments.First of all, the physical process of cartridge during launch is analyzed. Then, a finite element model of cartridge and chamber system is constructed which considers the deformation of locking mechanism and the influence brought by collision between cartridge and locking mechanism. The stress and strain distribution of aluminum alloy cartridge is gained by simulation calculation. The results show that the stress concentration location and damage location during tests are basically the same, which proves the results are creditable. The influences of different friction coefficients, shut clearances and materials on the dynamic response of aluminum alloy cartridge are analyzed by changing parameters of model, and gain many meaningful conclusions. Finally, the reasons of damages on mouth and body roots of cartridge are analyzed.The above conclusions could provide theoretical basis and data references for structural optimization and process improvement’s direction of aluminum alloy cartridges.