Impact-induced initiation thresholds of polytetrafluoroethylene/Al composite by gas gun
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摘要: 基于16 mm口径气炮撞击实验，对铝颗粒增强的聚四氟乙烯(polytetrafluoroethylene)/Al(PTFE/Al)冲击反应复合材料的冲击反应阈值开展了研究。为研究不同撞击加载条件下应变率和碰撞应力对PTFE/Al冲击诱发反应的影响，实验中采用铝、钢和低密度聚乙烯(low density polyethylene, LDPE)这3种不同材料的靶板及不同长度的试样，进行不同加载条件下的测试分析。实验结果显示，PTFE/Al材料的冲击诱发同时受到碰撞压力和加载应变率的影响。同时，通过对试样撞靶过程进行数值模拟，并与实验和理论结果进行对比。基于实验数据，拟合出PTFE/Al材料冲击反应的的预测曲线。Abstract: Impact experiments by a gas gun were conducted to investigate the impact-induced initiation thresholds of a PTFE (polytetrafluoroethylene)/Al composite using targets of steel, aluminum and low-density polyethylene (LDPE) materials and sample rods of four different lengths. By subjecting the samples under different loading conditions, it is shown that the impact-induced initiation of PTFE/Al is determined by both the impact pressure and the loading strain rate. The impact pressure and the strain rate thresholds for initiation were arrested by the experiments and the impacting process of the samples was modeled to compare the experimental and theoretical data. Based on all the experimental results, a theoretical curve was proposed to predict the impact-induced initiation of PTFE/Al under normal impact. The method proposed in this research can also be used in the study of other energetic materials.
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Key words:
- impact-induced initiation /
- thresholds /
- PTFE/Al /
- impact experiments
1) “第十一届全国爆炸力学学术会议”推荐论文 -
图 4 试样正撞击钢靶的高速摄影结果
Figure 4. High-speed video sequences of samples normally impacting steel targets
图 5 试样撞击不同材料靶板时撞击速度与碰撞压力关系
Figure 5. Relation between impact velocities and impact pressures during samples impacting different targets
图 6 试样撞击不同靶板时碰撞压力和加载应变率关系
Figure 6. Relation between impact pressure and loading strain rate during samples' impacting different targets
图 7 PTFE/Al材料在Taylor撞击实验中的剪切作用聚集区和冲击反应的出现位置
Figure 7. Intense shear region and first sign of ignition during Taylor anvil-on-rod impact test for PTFE/Al
图 8 数值模拟下PTFE/Al材料Taylor撞击中剪切应力分布
Figure 8. Shear stress distribution during Taylor anvil-on-rod impact test for PTFE/Al in simulation
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