壳体刻槽PELE冲击破碎数值模拟

为研究刻槽参数对横向效应侵彻弹丸(PELE)冲击破碎的影响规律,采用光滑粒子流体动力学方法,利用Johnson-Cook本构模型,引入最大主应力失效和随机失效准则,建立数值模拟模型,对PELE壳体的冲击破碎过程进行模拟,并试验验证了数值模拟模型的有效性。利用均匀设计方法确定刻槽数量、刻槽角度、刻槽深度的因素水平表和数值模拟方案,分析壳体的破碎情况。研究结果表明:该文采用的数值模拟模型能够有效模拟PELE的壳体破碎情况,壳体刻槽PELE侵彻贯穿靶板过程中,壳体的纵向断裂和破碎基本沿着刻槽位置开始,壳体破碎产生的碎片多为长条状。壳体破碎程度随刻槽数量的变化呈抛物线趋势变化,随刻槽角度的增大而减小,与刻槽数量、刻槽深度的乘积正相关。该文采用的数值模拟模型和研究方法可用于研究固体材料的冲击破碎。

Numerical Simulation for Impact Fragmentation of Jacket Grooved PELE

In order to study the influence of groove parameters on impact fragmentation of penetrator with lateral effect(PELE),the smoothing particle hydrodynamics method,Johnson-Cook strength model,the maximum principal stress failure and stochastic failure criteria were used to establish numerical model to simulate the fragmentation of projectile. The validity of the numerical model was verified by experimental results. The uniform design method was used to design the numerical simulation program and the level table of the number of grooves,groove angle,groove depth,and the fragmentation of projectile was analyzed. The research results show that the fragmentation of PELE can be effectively simulated by the numerical model; the longitudinal fracture of projectile jacket begins along the grooves,and the fragments produced by the fragmentation of projectile jacket are mostly long strips. The fragmentation degree of the projectile changes parabolically with the number of grooves and decreases with the increase of groove angle,and it is positively related to the product of groove number and groove depth. The numerical calculation model and research method can be used to study the impact fragmentation of solid materials.