Sharp Rank-One Convexity Conditions in Planar Isotropic Elasticity for the Additive Volumetric-Isochoric Split
Open Access
- 5 February 2021
- journal article
- research article
- Published by Springer Science and Business Media LLC in Journal of Elasticity
- Vol. 143 (2), 301-335
- https://doi.org/10.1007/s10659-021-09817-9
Abstract
We consider the volumetric-isochoric split in planar isotropic hyperelasticity and give a precise analysis of rank-one convexity criteria for this case, showing that the Legendre-Hadamard ellipticity condition separates and simplifies in a suitable sense. Starting from the classical two-dimensional criterion by Knowles and Sternberg, we can reduce the conditions for rank-one convexity to a family of one-dimensional coupled differential inequalities. In particular, this allows us to derive a simple rank-one convexity classification for generalized Hadamard energies of the type $W(F)=\frac{\mu }{2} \hspace{0.07em} \frac{\lVert F \rVert ^{2}}{\det F}+f(\det F)$ ; such an energy is rank-one convex if and only if the function $f$ is convex.
Keywords
Funding Information
- Romanian Ministry of Research and Innovation (PN-III-P1-1.1-TE-2019-0348)
- Projekt DEAL
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