Linear Isotropic Relations in Finite Hyperelasticity: Some General Results |
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Authors: | Jeremiah G Murphy |
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Institution: | (1) Department of Mechanical Engineering, Dublin City University, Glasnevin, Dublin 9, Ireland |
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Abstract: | The form of the classical stress–strain relations of linear elasticity are considered here within the context of nonlinear
elasticity. For both Cauchy and symmetric Piola-Kirchhoff stresses, conditions are obtained for the associated strain fields
so that they are independent of the material constants and compatible with existence of a strain–energy function. These conditions
can be integrated in both cases to obtain the most general strain field that satisfies these conditions and the corresponding
strain–energy function is obtained. In both cases, a natural choice of form of solution is suggested by the special case of
the compatibility conditions being satisfied identically. It will be shown that some strain–energy functions previously introduced
in the literature are special cases of the results obtained here. Some recent linear stress–strain relations, proposed in
the context of Cauchy elasticity, are examined to see if they are compatible with hyperelasticity.
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Keywords: | finite elasticity linear stress– strain relations compatibility hyperelasticity Hencky strain |
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