通过数值模拟研究了厚靶后表面在冲击加载下早期的几何变形特征,计算结果表明:厚靶变形存在一个由前凸型翻转为内凹型的时间窗口期,与传统研究薄靶的前凸型几何变形存在差异。结合电探针阵列测试方法获得的实验结果,从一个方面解释了工程实验中重复性不强的原因,因为这个窗口期非常敏感,与电探针阵列与后表面的距离密切相关。
Abstract
The geometric deformation at the early rear surface of thick target under impact loading was studied through numerical simulation, It was found that there exists a turnover time window during the thick target deformation. During the window period, the deformation is changed from former convex shape to concave shape, which is different from that of traditional thin target. Based on these results, we present an explaination on the experimental results by electric probe array technique. The window is very sensitive, and the electric probe array is closely related to the distance from the rear surface of the target, and therefore, the engineering experiment repeatability is not strong.
关键词
冲击动力学 /
厚靶 /
稀疏波 /
几何变形 /
数值模拟
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Key words
Impact dynamics /
thick target /
rarefaction wave /
geometric deformation /
numerical simulation
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参考文献
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脚注
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