集团装药爆炸下新型结构的削波性能

采用含孔穴的新型结构作为人防工程中的分配层,利用集团装药爆炸模拟航弹触地爆炸,对4种分配层结构抗集团爆炸载荷的防护效果进行了相似模拟室外化爆试验,并利用非线性软件LS-DYNA对该此4种模型进行了数值仿真。结果表明：同样厚度下,孔穴的存在使得后方的应力峰值被明显削弱,而且圆形孔穴对应力峰值的削弱程度要明显强于矩形孔穴;但在孔穴上方加入薄钢板层后,孔穴对其后方应力的削弱效果减弱,这是因为嵌含薄钢板后应力波的透射系数增大。研究结果为抗爆防震工程中新型防护层的科学设计提供了一定理论依据。

Clipping Performance of Advanced Structure under Explosion of Mass Ammunition

An advanced structure containing cavities is adopted in distribution layers.A series of large-scale similarity-simulation tests are carried out on defense effect of the four structures for mass ammunition,and numerical simulations are developed by LS-DYNA software.The results indicate that the stress peak is distinctively decayed behind the cavities,and the defense effect of circular-section cavity is more effective than that of rectangle-section cavity.But because the transmission coefficient of stress waves of the structure increases,the defense effect is weakened when a thin steel plate is laid above the cavities.