Abstract
A new general constitutive model in terms of the principal stretches is proposed to reflect limiting chain extensibility resulting in severe strain-stiffening for incompressible, isotropic, homogeneous elastic materials. The strain-energy density involves the logarithm function and has the general Valanis–Landel form. For specific functions in the Valanis–Landel representation, we obtain particular strain-energies, some of which have been proposed in the recent literature. The stress–stretch response in some basic homogeneous deformations is described for these particular strain-energy densities. It is shown that the stress response in these deformations is similar to that predicted by the Gent model involving the first invariant of the Cauchy–Green tensor. The models discussed here depend on both the first and second invariants.
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Horgan, C.O., Murphy, J.G. Limiting Chain Extensibility Constitutive Models of Valanis–Landel Type. J Elasticity 86, 101–111 (2007). https://doi.org/10.1007/s10659-006-9085-x
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DOI: https://doi.org/10.1007/s10659-006-9085-x
Key words
- constitutive model
- incompressible isotropic nonlinearly elastic materials
- limiting chain extensibility
- strain-stiffening
- Valanis–Landel form