An experimental and numerical study of cyclic deformation in metal-matrix composites |
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Authors: | J Llorca S Suresh A Needleman |
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Affiliation: | (1) Department of Materials Science, Polytechnic University of Madrid, ETS Ingenieros de Caminos, 28040 Madrid, Spain;(2) Division of Engineering, Brown University, 02912 Providence, RI |
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Abstract: | The cyclic stress-strain characteristics of discontinuously reinforced metal-matrix composites are studied both experimentally
and numerically. The model systems used for investigation are aluminum alloys reinforced with SiC particulates and whiskers.
Finite element analyses of the fatigue deformation of the composite are performed within the context of axisymmetric unit
cell formulations. Two constitutive relations are used to characterize the matrix of the composite: the fully dense Mises
model of an isotropically hardening elastic-viscoplastic solid and the Gurson model of a progressively cavitating elastic-viscoplastic
solid (to simulate ductile matrix failure by the nucleation and growth of voids). The brittle reinforcement phase is modeled
as elastic, and the interface between the ductile matrix and the reinforcement is taken to be perfectly bonded. The analyses
provide insights into the effects of reinforcement shape and concentration on (1) constrained matrix deformation under cyclic
loading conditions, (2) cyclic hardening and saturation, (3) the onset and progression of plastic flow and cavitation within
the matrix, and (4) cyclic ductility. The numerical predictions of flow strength, strain hardening, evolution of matrix field
quantities, and ductility under cyclic loading conditions are compared with those predicted for monotonic tensile deformation
and with experimental observations.
formerly Visiting Scientist, Division of Engineering, Brown University |
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