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ACOUSTIC-EMISSION DURING PLASTIC-DEFORMATION OF CRYSTALS - A LATTICE-DYNAMICS APPROACH
被引：15
作者：
TROCHIDIS, A
POLYZOS, B
机构：
[1] University of Thessaloniki, School of Engineering, Department of Physics and Mathematics
关键词：
D O I：
10.1063/1.360648
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
A lattice-dynamics approach to acoustic emission during plastic deformation of crystals is proposed. First the dynamics of a dislocation interacting with transverse acoustic waves is investigated on the basis of a microscopic Frenkel-Kontorova model in which the rigidity of the substrate is relaxed. It is shown that the interaction can be described by a d'Alembert wave equation for the elastic displacement coupled to a sine-Gordon equation that governs the dislocation dynamics. Within the framework of this model and considering the soliton nature of dislocations, two basic mechanisms of acoustic emission are investigated both analytically and numerically: One is the accelerated motion of dislocations and the other is the annihilation of dislocation kink-antikink pairs during Frank-Read source operation. The results are discussed on the basis of existing experimental data. © 1995 American Institute of Physics.
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页码：170 / 175
页数：6
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