中文摘要：

开展了PBX炸药的动态Brazilian试验,获得了不同加载应变率条件下的拉伸强度;通过高速摄影,获得了PBX炸药试样表面裂纹的产生发展过程;采用数字散斑相关方法,获得了试样出现裂纹前的应变场分布。利用离散元方法,开展了考虑PBX炸药细观结构的动态Brazilian数值模拟,获得了损伤演化发展、并形成裂纹的全过程,模拟结果能初步再现PBX炸药的损伤破坏过程。

英文摘要：

Dynamic Brazilian test of plastic-bonded explosives was investigated by split Hopkinson pressure bar（SHPB）.The tensile strengths of three PBXs were acquired under different strain rates.The evolution of crack on sample surface was captured using high-speed camera.The strain field was calculated by digital speckle correlation method before samples occured to crack.The simulation on dynamic Brazilian test was performed using discrete element method,and the simulation model considering meso-structure was acquired.The simulation results show the produce and evolution process of damage and crack,and the simulation results are in accordance with the experimental results.