内部爆炸加载下变壁厚壳体破碎性研究

为研究变壁厚壳体在内部爆炸加载下的破碎规律,设计了不同锥度的变壁厚壳体并分别从两端起爆,采用砂箱静爆法进行试验,回收了变壁厚壳体膨胀破裂生成的自然破片. 回收数据表明,从大端起爆时变壁厚壳体产生的破片数多于从小端起爆的情况,外表面锥度较大的壳体发生拉剪混合断裂的范围显著扩大. 采用Mott分布对破片数据进行拟合后,发现在相同结构下,从大端起爆时破片的特征质量更小. 基于Autodyn软件中的Stochastic随机破坏模型,对试验各工况进行了数值模拟,破片累积数分布结果与试验吻合较好,各工况之间的破片Mott特征质量规律与试验结果一致. 

Study of Variable Wall Thickness Shell Fragmentation Under Internal Explosive Loading

In order to investigate the fragmentation law of variable wall thickness shell under internal explosive loading, variable wall thickness shells with different taper were designed and experimented with initiation from both ends, explosion in a sand box for recover fragments. Experiment data show that in the case of initiation from the big end, variable wall thickness shell produces more fragments, and larger taper shells have more tension-shear mixing fracture region. After using the Mott distribution to fit and analyze fragments, it shows that in the case of initiation from the big end, the fragments' characteristic mass become smaller. Based on stochastic fracture model of Autodyn software, all the conditions of experiment were simulated, the fragments' cumulative distribution is matching with the experimental results, and the laws of fragments' characteristic mass of Mott fitting among the conditions from simulation are consistent with the experiment results.