冲击载荷下炸药装药动态响应的有限元分析及热点形成机理的数值模拟

对稳态温度场中受冲击载荷作用的炸药药柱进行了弹粘塑性分析。在Ｐｅｒｚｙｎａ本 构模型的基础上，作了适当的补充和修正，将流动参数γ、弹性模量Ｅ均视为温度的函数，动态 有限元计算结果表明，计算曲线和实验曲线有很好的近似。为模拟材料中不均匀性的影响，在 药柱中心引入一孔洞，有限元计算结果给出含孔洞药柱的粘塑性动态响应、药柱网格变形图以 及药柱等温线，可以清楚看出在孔洞附近区域有局部高温产生。本文的本构模型和计算方法对 于研究冲击载荷下炸药装药的力学响应以及炸药装药中热点形成机理的数值模拟提供了良好 的基础。

FINITE ELEMENT ANALYSIS OF DYNAMIC RESPONSE OF EXPLOSIVES SUBJECTED TO IMPACT AND SIMULATION CALCULATION OF HOT SPOT FORMATION IN EXPLOSIVES

In this paper elasto-visco-plastic analysis of explosive specimen subjected to impact under steady temperature field are conducted. The dominative equations are presented and the stress and the strain rate as a function of time are studied. The amendment of Perzyna's model of material behaviour,including Young' s modulus and fluidity as a function of temperature,has been conducted. To test this developed model,the comparison between the experimental results and calculation values have been done. The inhomogeneity of material is modeled by introducing a void at the center of the specimen. The numerical results show the concentration of strain near the void. The contour plots and curved surfaces of temperature demonstrate the elevation of the temperature field near the void.