Thermal residual stresses in functionally graded and layered 6061 Al/SiC materials |
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Authors: | S Ho E J Lavernia |
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Affiliation: | (1) Department of Chemical Engineering and Materials Science, University of California , Irvine, 92717-2575 Irvine, CA |
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Abstract: | The thermal residual stresses that develop in spray atomized and codeposited functionally graded and layered 6061 Al/SiC metal-matrix
composites (MMCs) during cooling from the codeposition temperature to ambient temperature were studied using thermo-elastoplastic
finite element analysis. In an effort to investigate the effect of layered and graded structures on the residual stress distribution,
the composites with homogeneous distribution of SiC particulates were also analyzed. The effect of SiC volume fraction in
the SiC-rich layers and the effect of SiC-rich layer thickness on the residual stresses were investigated. Based on the present
study, it was found that the residual stress distribution is very distinct for the aluminum and the SiC-rich layers in the
layered materials. As the volume fraction of SiC increases in the SiC-rich layer, the magnitude of residual stresses also
increases. The radial stress was found to be tensile in the aluminum layers and compressive in the SiC-rich layers. It was
also found that, as the thickness of the SiC-rich layer increases, the magnitude of radial stress in the aluminum layers increases,
and that in the SiC-rich layers decreases. In the graded material, the lower region of each layer exhibits tensile radial
stress, and the upper region of each layer shows compressive radial stress in order to maintain continuity between layers
during cooldown. In general, the layered and the graded materials have greater residual stresses and more complicated stress
distribution, as compared with those in the composite materials with homogeneous distribution of SiC particulates. |
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