Abstract
We provide some new necessary and sufficient conditions for regular isotropic rank-one convex functions on M 2 +={2×2 matrices such that det M≥0}. It is well known that isotropic functions W (M) can be written as W (M)=G(λ1, λ2) where λi are the singular values of M. One of these conditions allows us to understand better the gap between the rank-one convexity and the quasiconvexity.
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Aubert, G. Necessary and sufficient conditions for isotropic rank-one convex functions in dimension 2. J Elasticity 39, 31–46 (1995). https://doi.org/10.1007/BF00042440
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DOI: https://doi.org/10.1007/BF00042440