Thermal stresses in two- and three-component anisotropic materials |
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Authors: | Ladislav Ceniga |
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Institution: | (1) Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 043 53 Košice, Slovak Republic |
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Abstract: | This paper deals with an analytical model of thermal stresses which originate during a cooling process of an anisotropic solid
continuum with uniaxial or triaxial anisotropy. The anisotropic solid continuum consists of anisotropic spherical particles
periodically distributed in an anisotropic infinite matrix. The particles are or are not embedded in an anisotropic spherical
envelope, and the infinite matrix is imaginarily divided into identical cubic cells with central particles. The thermal stresses
are thus investigated within the cubic cell. This multi-particle-(envelope)-matrix system based on the cell model is applicable
to two- and three-component materials of precipitate-matrix and precipitate-envelope-matrix types, respectively. Finally,
an analysis of the determination of the thermal stresses in the multi-particle-(envelope)-matrix system which consists of
isotropic as well as uniaxial- and/or triaxial-anisotropic components is presented. Additionally, the thermal-stress induced
elastic energy density for the anisotropic components is also derived. These analytical models which are valid for isotropic,
anisotropic and isotropic–anisotropic multi-particle-(envelope)-matrix systems represent the determination of important material
characteristics. This analytical determination includes: (1) the determination of a critical particle radius which defines
a limit state regarding the crack initiation in an elastic, elastic-plastic and plastic components; (2) the determination
of dimensions and a shape of a crack propagated in a ceramic components; (3) the determination of an energy barrier and micro-/macro-strengthening
in a component; and (4) analytical–(experimental)–computational methods of the lifetime prediction. The determination of the
thermal stresses in the anisotropic components presented in this paper can be used to determine these material characteristics
of real two- and three-component materials with anisotropic components or with anisotropic and isotropic components. |
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Keywords: | Thermal stress Component material Anisotropic solid continuum Analytical modelling Cell model |
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