【作者】 张祖根； 李英雷； 王悟；

【Author】 Zhang zugena, Wang wua, Li yinghuaa, Li yingleia, Lu fangyunb( a. Laboratory for Shock Wave and Detonation Physics Research,Institute of Fluid Physics, CAEP, Mianyang 621900b. Science College, National University of Defense Technology, Changsha 410073)

【机构】 中物院流体物理研究所冲击波物理与爆轰物理研究室；

【摘要】 利用Hopkinson压杆装置对一种钝感炸药进行了动态压缩实验。实验采用了两种不同的加载技术及应变监测方法,结果表明:采用传统SHPB技术无法有效测量炸药类脆性材料的动态变形行为;通过采用波形整形技术控制加载波形,可以使试样在变形过程中较好地满足应力均匀性条件并改善应变率恒定性状况;通过采用在试样上直接贴片监测应变的方法,可以较准确的测得试样的应变。实验得到了材料在150s-1应变率的应力应变曲线及其动态破坏强度和破坏应变。结果表明,材料的应力应变关系具有率无关性。更多还原

【Abstract】 Hopkinson pressure bar experiments with or without pulse shaping techniques are conducted to study a brittleenergetic material JOB9003. The contratest results shows that for the brittle and low mechanical impedance materials,conventional SHPB experiment does not meet the precondition that the samples loaded dynamically with a SHPB apparatusshould be in dynamic stress equilibrium over the test duration, therefore, the experiment is invalid. The Pulse shapingtechniques can solve this problem perfectly. Furthermore, by using this technique, reasonable a constant strain rate over mostof the test duration was achieved.更多还原