弹丸挤进过程的有限元模拟与分析

本文针对依靠观察和实验难以解决的弹丸在枪管挤进过程中带有过盈摩擦大变形接触的难题,建立了弹丸挤进枪管的有限元分析模型,运用动态显式算法以及网格自适应技术,通过数值模拟研究了铅芯弹丸的挤进过程,展示了弹丸上膛线压痕的形成过程和材料的流动情况,分析了挤进前后弹头壳和铅芯的变形特征,以及挤进结束后弹丸的残余应力,从而为改进射...

Finite Element Simulation and Process Analysis of Projectile Entering into Barrel

For the contact problem of projectile entering into a barrel which is difficult to solve through observation and experiment,the finite element model of projectile and barrel was established to investigate the entering process with large deformation and full friction.The dynamic explicit algorithm and Arbitrary Lagrange-Eluerian(ALE) adaptive meshing technology were used to numerically simulate the entering process of lead core projectile.The formation of indentation on rifle and the material flow in projectile were revealed,and the deformation of bullet shell and lead core were analyzed before and after the projectile enters into the barrel,and the residual stress on the projectile was investigated.The results can provide the theoretical references to improve the firing accuracy.