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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。入射波并没有全部加载到试样上,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15000g。
The detached Hopkinson pressure bar (SHPB) device was used to study the damage and stress characteristics of lead azide during dynamic loading. The results show that under the dynamic load, the lead azide is greatly compressed, and the phenomenon of the broken charge structure, the decrease of the thickness of the fragments and the increase of the maximum density of 10% appears. By analyzing the transmitted wave, it can be seen that the lead azide tablets have undergone three steps of stress growth, balance and descent successively, and the specimens show the elastic behavior and brittle fracture characteristics. The incident wave is not all loaded on the sample, the actual stress time of the sample is shortened with the increase of the load intensity. Under the condition of split Hopkinson bar, the critical intrinsic anti-acceleration level of lead azide with no shell constraint is about 7500g in 100μs, and its peak value can reach 15000g.