重水的冲击压缩性

Shock Compressibility of Heavy Water

1.
Laboratory for Shock Wave and Detonation Physics Research, Southwest Institute of Fluid Physics, Chengdu 610003, China;
2.
Institute of Applied Physics, Chengdu University of Science and Technology, Chengdu 610065, China

摘要: 用二级轻气炮作为加载装置，测量了重水（D2O）的冲击压缩线，压力范围为10~43 GPa。用轴对称式电磁感应探头测量冲击波速度，测量精度约1.2%~1.5%。用电探针测量飞片速度，其精度约0.5%。用对比法原理进行测量，标准样品材料为无氧铜。实验发现，重水的冲击波速度随粒子速度变化呈斜率不同的两段直线关系，两线连结处出现拐折。分析认为，这一现象可能由液体D2O分子在冲击波作用下的离解过程引起。
- 重水 /
- 冲击压缩性 /
- 冲击离解
Abstract: Shock compression curve for heavy water (D2O) was measured in the range of 10～43 GPa by means of a two-stage light-gas gun. Shock velocities were measured to 1.2%～1.5% accuracy using the ASM probe. Impactor velocities were measured to 0.5% accuracy using an electric pin system with nanosecond time resolution. The shock impedance-match method was employed, in which the copper was used as standard. The results showed that two linear D-u fits were used to fit these data, and there exists a discontinuity between these two fits. This phenomenon may be ascribed to the dissociation of molecules of the heavy water.
- heavy water /
- shock compression /
- shock dissociation