活性材料PTFE／Al动态压缩性能

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活性材料PTFE／Al动态压缩性能
赵鹏铎[1] 卢芳云[1] 李俊玲[1] 陈荣[1] 徐松林[2] 阳世清[2][1]国防科技大学理学院,湖南长沙410073 [2]国防科技大学航天材料与工程学院,湖南长沙410073

摘　要:采用分离式霍普金森压杆（SHPB）实验技术，研究两种不同配比的聚四氟乙烯／铝（PTFE／Al）活性材料（PA265和PA35）在高应变率下的力学压缩性能与加载反应性能，对比分析了铝含量不同对PTFE／Al活性材料的屈服强度，破坏性能，反应性能的影响。研究结果表明：两种PTFE／Al活性材料存在应变率效应，在应变率1000～8000s^-1范围，PA265的屈服应力为32～44MPa，PA35的屈服应力为40～55MPa。铝含量越高，PTFE／Al的屈服强度越高；在应变率3100～5800s^-1范围内，两种材料的破坏应力基本相同，约为143～153MPa；PA265和PA35的临界反应应力分别为157，163MPa；铝粉含量不能高于35％，否则由于缺少足够的氧化剂（PTFE）而普遍出现不完全燃烧反应的现象。[著者文摘]

关键词:爆炸力学 分离式霍普金森压杆（SHPB） 高应变率 活性材料 聚四氟乙烯（PTFE）
分类号:　TQ325.4 TB333[机标]文献标识码：A文章编号：1006-9941（2009）04-0459-04栏目信息：研究论文
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The Dynamic Compressive Properties of PTFE/AI Reactive MaterialsZHAO Peng-duo , LU Fang-yun , LI Jun-ling , CHEN Rong , XU Song-lin , YANG Shi-qing 1. College of Science, National University of Defense Technology, Changsha 410073, China ; College of Aerospace and Materials Engineering, National University of Dcfense Technology, Changsha 410073, ChinaAbstract:The dynamic compressive and reactive properties of two kinds of PTFE/Al reactive materials were studied by the split Hopkinson pressure bars（SHPB）. The effects of Al content on yield stress, fragmented and reaetive properties of PTFE/Al reactive materials were analyzed. Results show that PTFE/Al is sensitive to the strain rate. In the strain rate range of 1000 - 8000 s ^-1 , the yield stress of PA265 is 32 -44 MPa and the yield stress of PA35 is 40 -55 MPa; the yield stress increases with Al content; the fragmented stress is 143 -153 MPa in the strain rate range of 3100- 5800 s^-1f or the PTFE/Al reactive materials; the critical reactive stresses of PA265 and PA35 are 157 MPa and 163 MPa; partial reaction phenomena appear frequently due to lacking of enough oxidant polytetrafluorethylene （PTFE） , if Al content is higher than 35%.[著者文摘]

Key words:explosion mechanics ; split Hopkinson pressure bar （SHPB） ; high strain rate ; reactive materials ; polytetrafluorethylene （PTFE ）