Polyconvexity does not imply true-stress-true-strain monotonicity for incompressible isotropic hyperelasticity in three dimensions, via an explicit softplus-based counterexample.
Ernest and Fosdick, Roger and Zhang, Ying
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Polyconvexity does not imply true-stress-true-strain monotonicity in the incompressible three-dimensional case
Polyconvexity does not imply true-stress-true-strain monotonicity for incompressible isotropic hyperelasticity in three dimensions, via an explicit softplus-based counterexample.