Generalized Hooke's law for isotropic second gradient materials
Abstract
In the spirit of Germain the most general objective stored elastic energy for a second gradient material is deduced using a literature result of Fortun\'e & Vall\'ee. Linear isotropic constitutive relations for stress and hyperstress in terms of strain and strain-gradient are then obtained proving that these materials are characterized by seven elastic moduli and generalizing previous studies by Toupin, Mindlin and Sokolowski. Using a suitable decomposition of the strain-gradient, it is found a necessary and sufficient condition, to be verified by the elastic moduli, assuring positive definiteness of the stored elastic energy. The problem of warping in linear torsion of a prismatic second gradient cylinder is formulated, thus obtaining a possible measurement procedure for one of the second gradient elastic moduli.
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Cite
@article{arxiv.1008.2879,
title = {Generalized Hooke's law for isotropic second gradient materials},
author = {F. dell'Isola and G. Sciarra and S. Vidoli},
journal= {arXiv preprint arXiv:1008.2879},
year = {2010}
}
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20 pages