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Elastoplastic deformation of multilayered materials during thermal cycling

Published online by Cambridge University Press:  03 March 2011

Y-L. Shen  and
S. Suresh
Y-L. Shen
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307
S. Suresh*
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307
*
a)Author to whom correspondence should be addressed.
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Abstract

Analytical models are presented for the elastoplastic deformation of multilayered materials subjected to fluctuating temperatures. The layered structure comprises an elastic-perfectly plastic ductile material sandwiched between two elastic brittle materials. With creep, heat transfer, and edge effects excluded, closed-form solutions for different characteristic temperatures for thermal cycling are presented as a function of the layer geometries and the thermomechanical properties of the constituent phases. The evolution of curvature, the generation of thermal residual stresses within each layer, and the onset and spread of plasticity in the ductile layer are also examined. It is theoretically shown that reversals of curvature in the layered solid can occur during monotonic changes in temperature, even when the thermomechanical properties of the layer do not vary significantly with temperature. The predictions of the analytical model are seen to compare favorably with experimental observations of curvatures during thermal cycling in the limiting case of bilayer composite with Al–Al2O3 layers and Al–Si layers and in a Si–Al–SiO2 trilayer system. Case studies of the effects of the relative variations in the geometry, elastic properties, and plastic response of the constituent phases on the overall deformation are examined for two practically significant layered systems: a Si–Al–SiO2 layered solid with extensive applications in the electronics industry and a Cr2O3-coated steel with an interlayer of a Ni–Al alloy which is used in structural applications.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 5 , May 1995 , pp. 1200 - 1215
Copyright
Copyright © Materials Research Society 1995

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References

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