叠氮化铅动态载荷下的响应特性研究

摘要

The dynamic response peculiarities of lead azide have been investugated by split Hopkinson pressure bar ( SHPB ) . It showed that the environnent of dynamic loading would make primary explosive charge compressed and broken,the density of fragments increased up toi0％. The tansmitted wave collected from SHPB revealed the effective action length and loading characters of charge, and the inner stress of lead azide charge experienced three steps. The lead azide charge without restrain could endme the accelerating load at the average level of 7 500g, and peak value up to 15 000g within 100 μ s.%采用分离式霍普金森压杆(SHPB)装置研究了叠氮化铅动态载荷下的损伤特性、受力特点.研究表明:动态载荷下叠氮化铅受压缩作用明显,出现了装药结构破损、碎片厚度减小且密度最大增幅达10%的试验现象.通过分析透射波,可见叠氮化铅药片依次经历了应力增长、平衡、下降3个过程,试样表现出了弹性行为和脆性断裂特征.入射波并没有伞部加载到试样上,试样实际受力时间随载荷强度的提高而缩短.在分离式Hopkinson杆条件下,无壳体约束叠氮化铅在100μs时间内的本征抗加速度临界水平在7500g左右,其峰值能达到15 000g.