Abstract
Finite element methods have been used to study the continuum aspects of the creep behavior of unidirectional discontinuous composites loaded parallel and transverse to the fiber axis. Microstructural features unique to eutectic composites are emphasized in these parametric studies. Modeling predicts that fiber creep resistance, the degree of load transfer to the fiber and flow constraint at fiber ends govern the longitudinal creep response. The transverse creep response is most sensitive to the matrix creep properties. These differences in strengthening mechanisms result in a pronounced anisotropy of minimum creep rates. Variations in microstructural parameters, including the fiber creep resistance and fiber aspect ratio, influence the composite creep strength through the load transfer and flow constraint. Load transfer and misfit-induced residual stresses affect the initial creep transients significantly. The results of the simulations are compared to analytical models and experimental creep data.
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