冲击加载下20钢中弹性前驱波衰减与应力松弛行为实验研究

王永刚; 贺红亮

doi:10.11858/gywlxb.2007.01.006

冲击加载下20钢中弹性前驱波衰减与应力松弛行为实验研究

doi: 10.11858/gywlxb.2007.01.006

王永刚^1,2,
贺红亮^1,

1.
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实验室，四川绵阳 621900；
2.
宁波大学工学院力学与材料研究中心，浙江宁波 315211

详细信息

通讯作者:
贺红亮

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出版历程
- 收稿日期: 2006-02-15
- 修回日期: 2006-04-13
- 发布日期: 2007-03-05

Investigation of Precursor Decay and Stress Relaxation in Shock-Compressed 20 Steel

WANG Yong-Gang^1,2,
HE Hong-Liang^1
,

1.
Laboratory for Shock Wave and Detonation Physics Research, Institute of Fluid Physics, CAEP, Mianyang 621900, China;
2.
Mechanics and Materials Science Research Center, Ningbo University, Ningbo 315211, China

More Information

Corresponding author: HE Hong-Liang

摘要

摘要: 通过改变样品厚度，对平面冲击加载下20钢的弹性前驱波的波幅衰减和应力松弛进行了实验研究。采用激光速度干涉测速仪（VISAR）实测了样品后自由面速度历史，采样频率达到1 ns，保证了实验结果的准确性。实验结果显示：Hugoniot弹性极限随着传播距离呈指数衰减，在所研究的样品厚度范围内，Hugoniot弹性极限减小了44%；应力松弛行为和弹性前驱波的上升沿时间也依赖于传播距离；冲击加载的强度对材料动态屈服行为的影响很小。
- 固体力学 /
- 弹性前驱波 /
- 应力松弛 /
- 20钢
Abstract: The precursor decay and stress relaxation behavior of 20 steel under shock compression were studied using planar impact experiments with different sample thickness. Time resolved free surface velocity profile measurements are performed by means of a velocity interferometer system for any reflector (VISAR) with the time resolution of 1 ns. The results show an apparent decay in the Hugoniot elastic limit with increasing propagation distance, as well as a stress relaxation behind the elastic wave front, and nearly 44% loss of Hugoniot elastic limit was observed in the present sample thickness range. The rise time of elastic wave fronts as a function of the sample thickness has also been determined accurately. Experiments with different impact velocities are carried out, and indicate apparently the independence of the dynamic yield behavior on the loading stress amplitude.
- solid mechanics /
- precursor decay /
- stress relaxation /
- 20 steel

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参考文献(16)

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