非球形弹丸超高速撞击充气压力容器碎片云特性数值模拟

Numerical simulation on characteristics of debris clouds produced by non spherical projectiles hypervelocity impact on pressure vessels

为解决非球形弹丸正撞击充气压力容器问题,应用非线性动力学分析软件AUTODYN,在相同质量和速度的条件下,采用光滑质点流体动力学方法 SPH,对具有不同长径比的圆锥形弹丸、圆柱形弹丸撞击压力容器产生的碎片云特性进行数值模拟,分别分析圆锥形弹丸、圆柱形弹丸长径比对碎片云形态、尖端速度及径向扩展直径的影响。结果表明:弹丸形状及弹丸长径比对碎片云在高压气体中的运动特性影响较大。随着弹丸长径比的增加,圆柱形弹丸碎片云径向扩展直径减小;随着弹丸长径比的增加,相同质量和相同撞击速度的圆锥形弹丸及圆柱形弹丸碎片云的损伤力增强。

Aimed at identifying the characteristics of debris clouds produced by non spherical projec- tiles hypervelocity impact on pressure vessels at normal angles, this paper introduces the use of SPH （smoothed particle hydrodynamics） methods in AUTODYN and an investigation into characteristics of debris cloud produced by conical projectiles and cylindrical projectiles with different ratio between length and radius hypervelocity impact on pressure vessels with the same mass and velocity by numerical simula- tion. Effects of the ratio between length and radius of the projectiles affecting on the form of debris cloud, tip particle velocity of debris cloud and radial extension of debris cloud are analyzed. The result shows that the shape of the projectiles and the ratio between length and radius have a greater effect on the dy- namic characteristic of debris cloud. Moreover, the increasing ratio between length and radius with cylin- drical projectiles results in a decreased diameter of debris cloud, and the damage of debris cloud rises up due to increasing ratio between length and radius both with conical projectiles and cylindrical projectiles.