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中文摘要：
为研究和评价炸药在机械撞击作用下的安全性,采用节点约束-分离的数值计算方法,联合热弹塑性材料本构方程和化学动力学方程,对PBX-2炸药的冲塞点火过程进行了数值模拟。探讨了网格尺寸对炸药冲塞温升的影响,获得了炸药冲塞过程中的力学破坏物理图像和局部温度时间曲线,计算得到了PBX-2炸药冲塞点火的临界跌落撞击速度。结果与实验值吻合较好,表明该方法可以有效地描述炸药冲塞破坏和热-力-化耦合作用下的点火反应。
英文摘要：
To investigate the ignition mechanism of explosives under impact,the node tie-breaking method combined with the thermo-elastic-plastic material constitution and chemical kinetics equations was used to simulate ignition for explosives of PBX-2.The influence of mesh size on the explosive＇s temperature rising was discussed.The explosive＇s mechanical damage image in the spigot test and local temperature rising curve were obtained.The critical drop velocity of ignition was calculated.The results are consistent with the experiment data better.It indicates that the approach can effectively describe the explosive＇s damage and ignition reaction under thermal-mechanical-chemical coupled effect.
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