Plasticity of Particle-Reinforced Composites With a Ductile Interphase

[+] Author and Article Information
K. Ding, G. J. Weng

Department of Mechanical and Aerospace Engineering, Rutgers University, New Brunswick, NJ 08903

J. Appl. Mech 65(3), 596-604 (Sep 01, 1998) (9 pages) doi:10.1115/1.2789100 History: Received June 24, 1997; Revised December 03, 1997; Online October 25, 2007


A homogenization theory is developed to determine the overall elastoplastic behavior of a particle-reinforced composite with a ductile interphase. Unlike most existing homogenization theories which are primarily concerned with the ordinary two-phase composites, the present one is confronted with two ductile phases, with one enclosing the other. The theory is developed with the aid of a linear comparison composite using a field-fluctuation method to calculate an energy-based effective stress of the ductile phases. In order to examine its accuracy, an exact elastic-plastic analysis under dilatational loading is also developed, and it was found that, despite its simplicity, the theory could provide plausible estimates for the overall behavior of the three-phase composite. The theory is applicable to a composite system regardless whether the interphase is more ductile or stiffer than the matrix, and when the interphase is more ductile, it is shown that even the presence of a thin layer can have a very significant effect on the plasticity of the overall composite.

Copyright © 1998 by The American Society of Mechanical Engineers
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