Control of strength anisotropy of metal matrix fiber composites

Published on Oct 1, 1994in Journal of Computer-aided Materials Design
· DOI :10.1007/BF00712851
Z. Z. Du1
Estimated H-index: 1
(UCSB: University of California, Santa Barbara),
R. M. McMeeking1
Estimated H-index: 1
(UCSB: University of California, Santa Barbara),
Robert M. McMeeking64
Estimated H-index: 64
(UCSB: University of California, Santa Barbara)
Sources
Abstract
This paper examines theoretically the stress distribution around fiber breaks in a unidirectional reinforced metal matrix composite, subjected to axial loading when plastic yielding of the matrix is allowed to occur. The composites considered have a ductile interphase, bonding the matrix to the fiber. The likelihood of failure of a fiber adjacent to the existing broken fiber is considered. Detailed and systematic results are given for composites with a wide range of fiber volume fractions, Young's modulus of the fibers and the matrix, interphase properties and Weibull modulus for the strength of the fibers. The objective is the optimization of these material and geometric variables to ensure global load sharing among the fibers in the longitudinal direction, which will give the composite good longitudinal strength. Calculations are carried out for transverse loading of the composite to determine the effect of the ductile interphase on the yield strength. Characteristics of the ductile interphase are determined that will provide good longitudinal strength through global load sharing and a relatively high yield strength in the direction transverse to the fibers. This, in turn, will allow control of the strength anisotropy of uniaxially reinforced metal matrix composites.
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