Geodesic
Finite strains of nonlinear elastic anisotropic materials
Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mehanika, no. 70 (2021), pp. 103-116 Cet article a éte moissonné depuis la source Math-Net.Ru

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Anisotropic materials with the symmetry of elastic properties inherent in crystals of cubic syngony are considered. Cubic materials are close to isotropic ones by their mechanical properties. For a cubic material, the elasticity tensor written in an arbitrary (laboratory) coordinate system, in the general case, has 21 non-zero components that are not independent. An experimental method is proposed for determining such a coordinate system, called canonical, in which a tensor of elastic properties includes only three nonzero independent constants. The nonlinear model of the mechanical behavior of cubic materials is developed, taking into account geometric and physical nonlinearities. The specific potential strain energy for a hyperelastic cubic material is written as a function of the tensor invariants, which are projections of the Cauchy-Green strain tensor into eigensubspaces of the cubic material. Expansions of elasticity tensors of the fourth and sixth ranks in tensor bases in eigensubspaces are determined for the cubic material. Relations between stresses and finite strains containing the second degree of deformations are obtained. The expressions for the stress tensor reflect the mutual influence of the processes occurring in various eigensubspaces of the material under consideration.
Keywords: anisotropy, hyperelasticity, finite strains, cubic materials, tensor bases
Mots-clés : invariants. 
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M. Yu. Sokolova; D. V. Khristich. Finite strains of nonlinear elastic anisotropic materials. Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mehanika, no. 70 (2021), pp. 103-116. http://geodesic.mathdoc.fr/item/VTGU_2021_70_a8/

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