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The relations of the nonlinear theory of elasticity were used to describe the nonlinear deformation of carbide-derived carbon composite material with a 2 D reinforcement scheme. The composite material is considered as an orthotropic body. A variant of specific strain energy potential, from which tensor-linear constitutive relations follow, has been proposed. The obtained relations are used to describe the simple types of loading of the composite material. The calculated diagrams agree satisfactorily with the experimental data.

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