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Numerical Simulations of Creep in Ductile-Phase Toughened Intermetallic Matrix Composites

Published online by Cambridge University Press:  15 February 2011

Gregory A. Henshall  and
Michael J. Strum
Gregory A. Henshall
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94551 (USA)
Michael J. Strum
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94551 (USA)
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Abstract

Analytical and finite element method (FEM) simulations of creep in idealized ductilephase toughened intermetallic composites are described. For these strong-matrix materials, the two types of analyses predict similar time-independent composite creep rates if each phase individually exhibits only steady-state creep. The composite creep rate increases above that of the monolithic intermetallic with increases in the stress exponent of the intermetallic, the volume fraction of the ductile phase, and the creep rate of the ductile phase. FEM analysis shows that the shape of the ductile phase does not affect the creep rate but may affect the internal stress and strain distributions, and thus damage accumulation rates. If primary creep occurs in one or both of the individual phases, the composite also exhibits primary creep. In this case, there can be significant deviations in the creep curves computed by the analytical and FEM models. The model predictions are compared with data for the Nb5Si3/Nb system.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 350: Symposium U – Intermetallic Matrix Composites III , 1994 , 65
Copyright
Copyright © Materials Research Society 1994

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