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Elastoplastic analysis of thermal cycling: Ceramic particles in a metallic matrix. (English) Zbl 0919.73059

Summary: Elastoplastic deformation induced by the thermal cycling of a particle-reinforced metal is studied analytically and numerically. The representative volume element considered for analysis is a spherical ceramic particle embedded within a hollow sphere of the metallic matrix. Closed-form solutions are derived for four characteristic temperatures which signify certain critical conditions for the onset and spread of plasticity in the composite during thermal fluctuations. These conditions are then evaluated for a wide variety of commonly studied metal-ceramic composites. The effective coefficient of thermal expansion is derived and is shown to be in agreement with finite element results obtained for an AL-SiC composite. Numerical simulations addressing plastic strain accumulation and interfacial decohesion during thermal cycling are also discussed with the objetive of providing some guidelines for the estimation of thermal fatigue life.

MSC:

74E30 Composite and mixture properties
74C99 Plastic materials, materials of stress-rate and internal-variable type
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