浇铸类炸药应力应变曲线的SHPB测量

李克武; 赵锋; 傅华

doi:10.11883/1001-1455(2015)06-0846-06

浇铸类炸药应力应变曲线的SHPB测量

doi: 10.11883/1001-1455(2015)06-0846-06

中国工程物理研究院流体物理研究所冲击波物理与爆轰物理重点实验室，四川绵阳 621999

详细信息

作者简介:
李克武(1983—), 男, 博士, 助理研究员

通讯作者:
赵锋, ifpzf@163.com

中图分类号: O381
计量
- 文章访问数: 3240
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- 被引次数: 0
出版历程
- 收稿日期: 2014-05-07
- 修回日期: 2014-09-03
- 刊出日期: 2015-12-10

SHPB technique for the dynamic stress-strain curve measurements of casting explosive

National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621999, Sichuan, China

摘要

摘要: 浇铸类炸药由于质地软、波阻抗及波速都很低，通过传统SHPB实验方法无法得到准确的应力应变数据。透射杆信号幅值过低、试样应力平衡均匀性不高以及大应变加载引起的入射波反射波重叠失效，是进行浇铸类炸药SHPB实验的难点所在。本文中对传统SHPB实验方法进行改进，在试样两端面加装石英晶体应力计，引入石英计所获得的应力数据与应变片测得数据共同对试样应力应变状态进行计算。该方法可以提高透射信号幅值，提供试样大应变加载，避免了入射波反射波重叠导致的信号失效问题，修正了SHPB实验过程中的应力时空不均匀性的影响，提高了实验结果的可靠性。利用改进后的实验方法对典型浇铸类炸药进行了实验研究，得到了较准确的应力应变曲线。
- 爆炸力学 /
- 应力不均匀 /
- SHPB实验 /
- 浇铸类炸药 /
- 低阻抗材料
Abstract: It is generally impossible to obtain valid constitutive data of casting explosive by conventional SHPB tests, due to its low impedance and soft texture and to its inability to attain uniformity required. A modified SHPB method is therefore proposed to get reliable dynamic response data of casting explosive. The piezoelectricity quartz gauges have been used to directly measure dynamic stress processing of specimen. This modified data processing method has been adopted, which can eliminate the effect caused by stress non-uniformity. By using the modified data processing, the signal failure problem caused by long pulse incident can also be resolved. With the modified SHPB method, satisfactory results have been obtained in processing casting explosive.
- mechanics of explosion /
- stress non-uniformness /
- SHPB tests /
- casting explosive /
- low impedance material

HTML全文

图 1 试样两端的应力时程曲线

Figure 1. Dynamic stress equilibrium processing of specimen

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图 2 传统SHPB信号

Figure 2. Signal of conventional SHPB test

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图 3 入射杆简要示意图

Figure 3. Sketch of incident bar

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图 4 实验示意图

Figure 4. Diagram of modified SHPB test

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图 5 对高阻抗材料的实验结果

Figure 5. Results of both modified and conventional SHPB tests applied on high impedance materials

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图 6 各传感器载荷计算结果

Figure 6. Calculation results of transducers

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图 7 典型信号波形

Figure 7. Experimental record of modified SHPB test

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图 8 时间平移示意图

Figure 8. Diagram of time-translation method

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图 9 不同温度下的应力应变曲线

Figure 9. Dynamic stress-strain curves under different temperatures

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