装药内球形孔隙随加载率变形特性的数值模拟

Numerical Simulation on Transformation Characteristic of Global Hole in Charge with Loading Rate

装药内孔隙是引发炸药膛炸的根本原因,用固液混合炸药作为介质来填充战斗部,其装药内部比固态炸药易形成孔隙,孔隙体积的变化直接决定孔隙内的温度,所以研究孔隙的变形特性对发射安全性有重要意义。运用ANSYS软件建立战斗部装药孔隙模型,采用LS-DYNA流固耦合分析方法对球形孔隙进行数值模拟,研究孔隙压力和相对体积的变化对孔隙内温度的影响。得到在载荷作用下孔隙边界的压力变化;随着加载率的增大,同一时刻,孔隙相对体积变小;当加至最大载荷,再持续施加恒载荷,孔隙的边界压力和相对体积变化非常缓慢;研究了在载荷作用下孔隙的形变过程.

In order to study the boundary pressure of charge hole in warhead and the effects of the relative hole bulk on the temperature in bole, a model of charge hole was established by ANSYS software, and transformation characteristic of the hole was simulated with solld-liquid coupling method of LS-DYNA. The transformation process of hole under loading was studied as well. Results show that, with loading rates increasing, the relative bulk of hole lessens and the boundary pressure of the hole increases. However, when the load is up to the maximal load and maintained, their change is slow.