基于有限元与光滑粒子耦合的弹丸挤进过程分析

Engraving process analysis of projectiles based on coupling of FEM and SPH

基于有限元(FEM)与光滑粒子(SPH)耦合算法,建立弹丸身管耦合系统动力学模型。通过对某大口径火炮弹丸挤进过程进行数值模拟,弥补弹丸挤进过程有限元分析方法无法有效模拟弹带大变形缺陷,成功模拟出弹丸挤进阶段弹带塑性流动过程,在此基础上深入研究弹带的应力应变变化规律。分析弹丸初始装填角、弹炮间隙、弹丸装填不到位等因素对挤进过程中弹丸动力响应影响。结果表明,仿真与实弹射击的弹带变形一致性较好。

Based on the coupling algorithm of finite element method（ FEM） and smoothed particle hydrodynamics（ SPH） method,the dynamic model of a projectile-barrel coupled system was established. The numerical simulation of the engraving process of projectiles of a heavy caliber gun was performed,it remedied the deficiencies of FEM,FEM couldn＇t simulate the large deformation of a bearing band effectively. The plastic flow of the bearing band was successfully simulated in the engraving process of projectiles. Furthermore,the stress and strain varying laws of the bearing band were intensively studied. The influences of initial loading angle of projectile,gap between barrel and projectile and projectile not filled in position on the dynamic responses of a projectile in the engraving process were analyzed. The results showed that the deformations of the bearing bend obtained with simulation agrees well with those measured in live weapon firings.