动载下剪应力对硫化镉单晶相变影响的实验研究

唐志平; Gupta Y M

doi:10.11858/gywlxb.1989.04.005

动载下剪应力对硫化镉单晶相变影响的实验研究

doi: 10.11858/gywlxb.1989.04.005

唐志平^1,,
Gupta Y M²

1.
中国科学技术大学，安徽合肥 230026；
2.
华盛顿州立大学，美国华盛顿

详细信息

通讯作者:
唐志平

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出版历程
- 收稿日期: 1989-08-05
- 修回日期: 1989-08-05
- 发布日期: 1989-12-05

Experimental Study of the Effect of Shear Stress on Phase Transition in c-Axis CdS Single Crystal under Dynamic Loading

TANG Zhi-Ping^1
,,
Gupta Y M²

1.
University of Science and Technology of China, Hefei 230026, China;
2.
Washington State University, Washington, USA

More Information

Corresponding author: TANG Zhi-Ping

摘要

摘要: 动载下剪应力对相变起始压力有无影响，长期以来一直是一个未解决的问题。Duvall和Graham建议用硫化镉（CdS）晶体来作为判断材料。本文采用前后压电石英传感器方法系统地研究了高速平面撞击下的c轴CdS单晶试样中剪应力对相变起始压力的影响。实验测得其轴向相变起始应力为T=(3.250.1) GPa，对应的平均压力pT=(2.290.07) GPa，与静高压值2.3 GPa相比在实验误差范围内很吻合，这时相应的剪应力T=0.72 GPa，高达平均压力的31.5%。这一结果表明，相变机制可以假定为仅与临界平均应力或临界热力学状态有关，剪应力对相变起始压力的影响可以忽略。
- 剪应力 /
- 相变 /
- 高速平面撞击
Abstract: For a long time, the problem whether shear stress affects the phase transition initial pressure is not well solved. Duvall and Graham suggested that cadmium sulfide (CdS) crystal could be used to study the effect of shear stress on the initial pressure of phase transition in c-axis CdS single crystal specimens under high velocity impact systematically. The axial stress of initial phase transition measured is T=(3.250.1) GPa, corresponding to a mean pressure pT=(2.290.07) GPa, which agrees the value 2.3 GPa of static results quite well within the experimental error. The shear stress in this case, T=0.72 GPa, is as high as 31.5% of the mean pressure. This result shows that the mechanism of phase transition may be assumed only to relate to a critical mean pressure or critical thermodynamic state, and the effect of shear stress can be ignored.
- shear stress /
- phase transition /
- high velocity impact

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参考文献(21)

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