包覆式活性破片冲击激发临界条件研究

Study on critical conditions of impact excitation of coated reactive fragments

为研究包覆式活性破片冲击激发速度阈值的影响条件,利用非线性有限元分析软件,对包覆式活性破片的冲击激发过程进行数值模拟,分析了破片结构参数对激发速度阈值的影响,建立了包括壳体头部厚度、侧壁厚度、长径比、壳体材料、靶板材料的经验表达式。实验结果表明:利用该式可对包覆式活性破片冲击激发临界条件进行计算;破片结构对冲击激发速度阈值影响较大,提高壳体密度、侧壁厚,增加长径比,减小壳体头部厚度能有效降低破片冲击激发速度阈值。

In order to study the influence conditions of the impact excitation velocity threshold of coated reactive fragments, this paper numerically simulates the impact excitation process of coated reactive materials by using the nonlinear finite element analysis software. The influence of fragment structural parameters on the excitation velocity threshold is analyzed, and the empirical expressions including shell head thickness, side wall thickness, aspect ratio, shell materials and target materials are established. The results show that the critical conditions of impact excitation of coated active fragments can be calculated by using this formula. The fragment structure has a great influence on the impact excitation velocity threshold. An increase in shell density, side wall thickness, and aspect ratio and a decrease in shell head thickness can effectively reduce the fragment impact excitation velocity threshold.