带模拟装药弹体高速冲击岩石靶时的断裂特性

Simulation of explosive simulant filled with high-velocity projectiles crushing onto rock

针对高速侵彻过程中的弹体破碎断裂问题,本文中设计2种不同壁厚的试验弹,进行约1 000 m/s着速的高强度岩体侵彻试验,试验表明:在该高着速条件下,两种结构的试验弹体均发生完全破碎且未能有效侵入岩石靶,而岩石靶体仅在表层产生粉碎性破坏;另外,高速侵彻岩石靶的弹体头部破碎情况与侵彻金属薄靶有所区别。在试验基础上,利用Autodyn-3D建立了弹体侵彻岩石靶的物理模型,结合SPH算法与Mott失效模型对弹体破坏过程进行了数值模拟,可有效地揭示弹体破碎机理,并进一步讨论模拟装药和小范围内不同高速对弹体破坏的影响。试验结果和建立的数值模型可为研究高速侵彻中弹体结构安全提供参考。

Addressing the projectile crush during high-speed penetration,we designed projectiles with two different shell thicknesses and conducted experiment for penetrating high-strength rock target at1000m/s.The experimental results showed that projectiles with different shell thicknesses were completely broken and failed to effectively penetrate the rock target while the rock target was only comminuted on the surface,and that the fragmentation of the projectile tip during high-speed penetration in rock target was different from that in the thin metal target.In addition,based on the experimental results,we established the simulation model of the projectile penetrating the rock target using Autodyn-3D.Combining the SPH method with the Mott distribution failure model,we performed the numerical simulation of the projectile s crush process and revealed the mechanism of the projectile s breaking.Furthermore,we examined the influence of the simulated charge and the small range of different high velocities on the projectile s crush.The experimental results and the proposed numerical method can serve as reference for further study of the projectile s structure during high velocity penetration.