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RESEARCH PAPERS

Plastic Deformation of a Laminated Plate With a Hole

[+] Author and Article Information
Y. A. Bahei-El-Din

Department of Civil Engineering, Duke University, Durham, N.C.

G. J. Dvorak

Department of Civil Engineering, University of Utah, Salt Lake City, Utah 84112

J. Appl. Mech 47(4), 827-832 (Dec 01, 1980) (6 pages) doi:10.1115/1.3153798 History: Received February 01, 1980; Revised May 01, 1980; Online July 21, 2009

Abstract

The elastic-plastic behavior of a (0/90) symmetric FP-Al plate containing a circular hole is investigated using the finite-element method. Of principal concern are plastic yielding at the circular hole and fracture of the plate caused by failure of the fiber at the hole. The results illustrate the significance of plasticity in deformation of metal-matrix composites. The behavior of the laminated plate is compared with that of a geometrically similar plate made of an unreinforced matrix material, for uniaxial loading/unloading/reloading sequences. The comparison reveals significant differences in the role of plastic deformation in these two materials. Specifically, plastic yielding in the matrix of the laminated plate at the circular hole leads to a substantial increase in the local stress concentration in the elastic fibers adjacent to the hole boundary. Also, it is found that the fiber reinforcement causes a large increase in the stiffness and strength of the composite, but only a minor elevation of its yield strength. Therefore, to take advantage of the mechanical properties of the metal matrix composite material, it is necessary to admit working loads which exceed its elastic limit.

Copyright © 1980 by ASME
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