基于ALE算法的膛炸数值模拟

为了调查某坦克炮发射破甲弹时导致膛炸事故发生的可能原因，就引信提前解除保险引发战斗部装药的爆炸情况进行研究，采用流固耦合方法对身管膛炸的力学特性进行数值模拟，计算身管断裂时的应力变化。首先，利用Solidworks建立身管、弹丸壳体、战斗部装药以及空气域的模型，并利用Hypermesh进行有限元网格划分。然后，在LS-DYNA计算平台中采用任意拉格朗日-欧拉(ALE)算法，求解炸药与身管之间的流固耦合问题，成功模拟了引信提前解除保险引发战斗部装药爆炸时对身管的破坏作用，基本复现了身管的断裂情况。计算结果表明：炸药瞬间引爆在身管内壁造成的压力可达29 GPa;并且身管内壁压力的变化规律呈骤升骤降趋势，这与炸药爆炸产生的爆炸冲击波能量的变化规律密切相关。此外，膛炸发生时，产生的碎片较为均匀，身管两侧断裂情况与实际情况较为符合，可为进一步研究引信提前解除保险引发战斗部装药的爆炸对身管的破坏效应等提供参考。

Numerical Simulation of Artillery Chamber Explosion Using ALE Algorithm

In order to investigate the possible causes of the tank chamber-explosion accident when a tank gun fires armor-piercing projectiles,the explosion of warhead charge caused by the early release of fuze was studied. The fluid-solid coupling method was adopted to simulate the process of tank chamber-explosion,and the mechanical characteristics were obtained,such as the stress variation. Firstly,the models of barrel,projectile shell,warhead charge and air domain were established by Solidworks,and the finite element mesh was divided by Hypermesh. Then,an arbitrary Lagrangian-Eulerian(ALE)algorithm was applied to solve the fluid-solid coupling problem between the explosive and the barrel in the LS-DYNA software,and the damage to the barrel caused by the explosion of the combatant charge triggered by the early fuse release was successfully simulated,and the fracture of barrel was basically reproduced. The results show that the stress on the inner barrel wall caused by the instantaneous detonation of the explosive can reach 29 GPa,and the change law of the inner wall pressure of the barrel shows a sudden rise and drop trend,which is closely related to the change law of the explosion shock wave energy produced by the explosive explosion. Furthermore,the produced fragments are uniform. Good agreements of the fracture characteristics have achieved between the numerical simulation and the actual situation. It can provide a useful reference for the further study of the actual situation,such as the damage effect of the explosion of warhead charge on the barrel caused by the early release of fuze.