How contact interactions may depend on the shape of Cauchy cuts in N-th gradient continua: approach "à la D'Alembert"

Francesco Dell'Isola 1, 2, 3 Pierre Seppecher 4, 5, 6 Angela Madeo 7, 8
1 Dipartimento di Ingegneria Strutturale e Geotecnica
2 Laboratorio Strutture e Materiali Intelligenti - Fondazione Tullio Levi-Civita
3 International Research Centre on "Mathematics & Mechanics of Complex Systems" M& MOCS
4 International Research Centre on "Mathematics & Mechanics of Complex Systems" M&MoCS
5 IMATH - Institut de Mathématiques de Toulon - EA 2134
6 ANLA - Laboratoire d'Analyse Non Linéaire Appliquée
7 International Center M&MoCS "Mathematics and Mechanics of Complex Systems"
8 LGCIE - Laboratoire de Génie Civil et d'Ingénierie Environnementale
Abstract : Navier-Cauchy format for Continuum Mechanics is based on the concept of contact interaction between subbodies of a given continuous body. In this paper it is shown how -by means of the Principle of Virtual Powers- it is possible to generalize Cauchy representation formulas for contact interactions to the case of N-th gradient continua, i.e. continua in which the deformation energy depends on the deformation Green-Saint-Venant tensor and all its N-1 order gradients. In particular, in this paper the explicit representation formulas to be used in N-th gradient continua to determine contact interactions as functions of the shape of Cauchy Cuts are derived. It is therefore shown that i) these interactions must include edge (i.e. concentrated on curves) and wedge (i.e. concentrated on points) interactions, and ii) these interactions cannot reduce simply to forces: indeed the concept of K-forces (generalizing similar concepts introduced by Rivlin, Mindlin, Green and Germain) is fundamental and unavoidable in the theory of N-th gradient continua.
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Zeitschrift für Angewandte Mathematik und Physik, Springer Verlag, 2012, 63 (6), pp.1119-1141
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Francesco Dell'Isola, Pierre Seppecher, Angela Madeo. How contact interactions may depend on the shape of Cauchy cuts in N-th gradient continua: approach "à la D'Alembert". Zeitschrift für Angewandte Mathematik und Physik, Springer Verlag, 2012, 63 (6), pp.1119-1141. 〈hal-00662376〉

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