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Acta Metall Sin  1995, Vol. 31 Issue (10): 431-437    DOI:
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A NEW THEORY OF DISLOCATION MOTION AND ITS APPLICATION TO DESCRIPTION OF DYNAMIC MECHANICAL BEHAVIOUR OF MATERIALS
CHENG Jingyi;ZHOU Guangquan(University of Science and Technology of China;Hefei 230026)(Manuscript received 1995-01-03; in revised form 1995-06-10)
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CHENG Jingyi;ZHOU Guangquan(University of Science and Technology of China;Hefei 230026)(Manuscript received 1995-01-03; in revised form 1995-06-10). A NEW THEORY OF DISLOCATION MOTION AND ITS APPLICATION TO DESCRIPTION OF DYNAMIC MECHANICAL BEHAVIOUR OF MATERIALS. Acta Metall Sin, 1995, 31(10): 431-437.

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Abstract  By the analysis of the dynamic processes of the movement of dislocations through a crystal lattice, a unified theory of collection dislocation motion including both thermal activation and viscous drag effects is proposed. The theory is able to describe the average behaviour of dislocations which move at low and high velocities with a simple equation.The experimental dislocation velocity─stress relation data of KCl crystals are fitted with the theory. Good consistency is obtained. The theory can be used as the start point in establishing the constitutive laws of macroscopic plastic deformation of crystalline materials.Correspondent. CHENG Jingyi, associate professor, Department of Mechanics and Mechanical Engineering,University of Science and Technology of China, Hefei 230026
Key words:  dislocation dynamics      viscous drag effect      unified theory     
Received:  18 October 1995     
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