An Edge Dislocation in a Three-Phase Composite Cylinder Model

[+] Author and Article Information
H. A. Luo, Y. Chen

Department of Mechanics and Materials Science, Rutgers-The State University of New Jersey, Piscataway, NJ 08854

J. Appl. Mech 58(1), 75-86 (Mar 01, 1991) (12 pages) doi:10.1115/1.2897182 History: Received May 09, 1989; Revised March 01, 1990; Online March 31, 2008


An exact solution is given for the stress field due to an edge dislocation embedded in a three-phase composite cylinder. The force on the dislocation is then derived, from which a set of simple approximate formulae is also suggested. It is shown that, in comparison with the two-phase model adopted by Dundurs and Mura (1964), the three-phase model allows the dislocation to have a stable equilibrium position under much less stringent combinations of the material constants. As a result, the so-called trapping mechanism of dislocations is more likely to take place in the three-phase model. Also, the analysis and calculation show that in the three-phase model the orientation of Burgers vector has only limited influence on the stability of dislocation. This behavior is pronouncedly different from that predicted by the two-phase model.

Copyright © 1991 by The American Society of Mechanical Engineers
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