On the role of the invariant “I 4 ” in conventional couple-stress hyperelasticity

Abstract

This short communication rectifies an issue that may cause controversy in a recent publication and thus removes some doubt recorded in the same regarding its ability to determine the spherical part of the couple-stress in the case of large elastic deformations of isotropic polar materials.

Keywords

Couple-stress theory Cosserat theoretical framework polar material hyperelasticity

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