Experimental Study of the Effect of Shear Stress on Phase Transition in c-Axis CdS Single Crystal under Dynamic Loading
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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。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.
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Key words:
- shear stress /
- phase transition /
- high velocity impact
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Bancroft D, Peterson E L, Minshall F S. J Appl Phys, 1956, 27: 291. Duvall G E, Graham R A. Review of Modern Physics, 1977, 49(3): 523. Minshall F S. In: Response of Metals to High Velocity Deformation. P G Shewmon, V F Zackay eds. New York: Interscience. 1961. Loree T R, Fowler C M, Zukas E G, et al. J Appl Phys, 1966, 37(4): 1918. Duvall G E. In: Propagation of Shock Waves in Solids. Edited by E Variey. New York: The American Society of Mechanical Engineers, 1976: 97. Edwards A L, Siykhouce T E, Drickamer H G. J Phys Chem Solids, 1959, 11: 140. Edwards A L, Drickamer H G. Phys Rev, 1961, 122(4): 1149. Kenedy J D, Benedick W B. J Phys Chem Solids, 1966, 27: 125. Tang Z P. A literature review of phase transition in cadmium sulfide. Internal Report SDL-86-06. Shock Dynamics Laboratory, Washington State Univ, 1986. Jones O E, Graham R A. In: Accurate Characterization of the High Pressure Enviroment. E C Lloyd ed. Washington D C: National Bureau of Standards, 1971. Tang Z P, Gupta Y M. J Appl Phys, 1988, 64(4): 1827. Tang Z P, Gupta Y M. In: Shock Waves in Condensed Matter-1987. S C Schmidt, N C Holmes eds. North-Holland Amsterdam, 1988: 305. Graham R A. J App Phys, 1975, 46: 1901. Tang Z P, Bellamy P M, Gupta Y M. In: Shock Waves in Condensed Matter-1987. S C Schmidt, N C Holmes eds. Amsterdam: NorthHolland, 1988: 609. Tang Z P, Gupta Y M, Bellamy P M. Rev Sci Instrum, 1988, 59(7): 1189. Tang Z P. Data reduction of the half-inch shorted quartz gauge record using the code Interp. lnteral Report SDL-88-01, Shock Dynamics Laboratory, Washington State Univ, 1987. Ingram G E, Graham R A. In: Fifth Symposium (International) on Detonation. Office of Naval Research Document ACR 184. Government Printing Office, 1970: 369. Barker L M, Hollenbach R E. J Appl Phys, 1970, 41: 4208. Fuller E R. The study of covalent bonding by means of elastic constants. Univ of Illinois, 1973. Samara O A, Giardini A A. Phys Rev, 1965, 140(1A): 388. Thurston R R. In: Physical Accousties. ed by W P Mason. New York: Academic Press, 1964.
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