| Due to the assumed incompressibility, only isochoric deformations are allowed for the introduced model. |
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| They should be taken with care, as pressure increases with temperature in these isochoric calculations. |
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| Thus we negatively answer Morrey's conjecture in the subclass of isochoric nonlinear energies, since polyconvexity implies quasiconvexity. |
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| In this work, the isochoric method is used. |
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