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Residual stresses and stored elastic energy of composites and polycrystals. (English) Zbl 0701.73008
Summary: Residual stresses in heterogeneous materials may arise because of differential or anisotropic thermal expansion of constituents. The paper is concerned with thermoelastic solids whose material properties fluctuate on the microscopic scale. Rigorous general relations between stored elastic energy and statistical averages (mean values and fluctuations) of residual stresses are derived. These results are applied to two-phase composites and to materials where the fluctuations of elastic constants can be neglected. One obtains exactly the stored energy, certain conditional mean values and the covariance matrix of the residual stresses. Under the assumptions of statistical homogeneity and isotropy, the results hold for any type of heterogeneous microstructure.

74A40 Random materials and composite materials
74S30 Other numerical methods in solid mechanics (MSC2010)
74P10 Optimization of other properties in solid mechanics
74E05 Inhomogeneity in solid mechanics
74A15 Thermodynamics in solid mechanics
82D30 Statistical mechanical studies of random media, disordered materials (including liquid crystals and spin glasses)
74E30 Composite and mixture properties
Full Text: DOI
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