某含铝PBX压缩性能的应变率与温度效应

陈丁丁; 卢芳云; 林玉亮; 蒋邦海

doi:10.11858/gywlxb.2013.03.007

某含铝PBX压缩性能的应变率与温度效应

doi: 10.11858/gywlxb.2013.03.007

国防科学技术大学理学院，湖南长沙 410073

详细信息

通讯作者:
卢芳云 E-mail:fylu@nudt.edu.cn

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出版历程
- 收稿日期: 2011-08-19
- 修回日期: 2011-09-23
- 发布日期: 2013-06-15

Effects of Strain Rate and Temperature on Compressive Properties of an Aluminized PBX

College of Science, National University of Defense Technology, Changsha 410073, China

摘要

摘要: 武器弹药在生产、存储、使用等过程中难免需要经受高温、高压、冲击等恶劣环境的考验。在这些极端环境下，作为装填物的高能炸药的力学性能在很大程度上会影响弹药的安全性，因此有必要对其力学性能展开深入的研究。在分离式霍普金森压杆实验平台上，采用单独加热试样快速装配的方法，对某含铝高聚物粘结炸药（PBX）在不同温度、不同应变率下的压缩性能进行了实验研究。在4种温度（12、29、45和62 ℃）下分别得到了不同应变率（250~1 200 s-1）加载下的压缩力学性能。实验结果表明，该PBX的压缩强度具有明显的应变率强化效应和温度软化效应，并且具有较好的线性关系，但破坏应变没有明显的变化。根据所得实验结果，利用双线性函数对压缩强度与温度和应变率之间的关系进行了拟合，认为此关系式仅适用于温度高于粘结剂玻璃转化温度情况下的动态压缩性能。
- 高聚物粘结炸药 /
- 温度 /
- 应变率 /
- 压缩 /
- 分离式霍普金森压杆
Abstract: Weapons have to face some extremely abominable situations, such as high temperature, high pressure, shock loadings, etc. In such situations, the mechanical properties of the high explosive filled in weapons will decide the level of security of the whole system, making it necessary to get a deep understanding on the mechanical properties of these explosives. In this work, we tested the dynamic compressive properties of an aluminized polymer bonded explosive (PBX) at four temperatures (12, 29, 45 and 62 ℃) by using split Hopkinson pressure bars. Specimens were heated individually before fixed to the bars to get the target temperature. The strain rate was ranged from 250 s-1 to 1 200 s-1. The results show the failure compressive stress is strongly dependent on strain rates and temperatures, while the failure strain almost keeps constant. The failure stress increases obviously with the rise of strain rates and the decrease of temperatures. And a double-linear function is used to fit the compressive failure stress-strain rate temperature relationship. However, this relationship for dynamic compression may become invalid when the temperature is lower than the glass transition temperature.
- polymer bonded explosive (PBX) /
- temperature /
- strain rate /
- split Hopkinson pressure bar /
- compression

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参考文献(23)

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