Analysis of very high speed impact
Analysis of very high speed impact
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DOI：
10.1016/0020-7225(87)90073-5
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发表时间：
1987
影响因子：
6.6
通讯作者：
M. Ravid;S. Bodner;I. Holcman
中科院分区：
文献类型：
--
作者：
M. Ravid;S. Bodner;I. Holcman
圆柱杆对靶板的超高速撞击(>；1000m/S)的研究一般集中在对结构部件进行细分的网格点处控制场和材料方程的数值求解。本文给出了影响区内法向碰撞响应的近似二维解析解。该分析考虑了在结构部件中产生的冲击波及其随后由于稀疏波而减少的情况。这反过来又会导致邻近目标区域和弹丸前部的塑性流动区域。考虑到应变率相关的塑性流动以及由于局部和对流加速而产生的惯性力的总体工作速率相等使得能够确定目标空腔直径。文中还考虑了弹丸材料的可能失效。分析一直进行到杆中的冲击波效应变得相对不重要的时候。在此期间，分析模型确定了弹丸和靶体的相互作用力、侵彻速度、变形几何形状、应变率和流动应力。
Investigations of the very high speed impact (> 1000 m/s) of cylindrical rods on target plates have generally concentrated on the numerical solution of the governing field and material equations at mesh points subdividing the structural components. In the present paper, an approximate two-dimensional analytical solution is obtained for the response to normal impact in the regions of influence. The analysis considers shock waves generated in the structural components and their subsequent reduction due to rarefaction waves. This, in turn, leads to zones of plastic flow in adjacent target regions and in the mushroomed frontal section of the projectile. An overall work rate equality that accounts for strain rate dependent plastic flow and also for inertial forces due to local and convective accelerations enables determination of the target cavity diameter. Possible failure of projectile material is also considered. The analysis is carried out up to the time that shock wave effects in the rod become relatively unimportant. During this period, the analytical model determines the interactive forces, the penetration velocity, and the deformation geometry, strain rates, and flow stresses of the projectile and target.