Accéder directement au contenu Accéder directement à la navigation
Article dans une revue

Convex analysis and thermodynamics

Nelly Point 1 Silvano Erlicher 2
1 Dynamique des structures et identification
navier umr 8205 - Laboratoire Navier
Abstract : Convex analysis is very useful to prove that a material model fulfills the second law of thermodynamics. Dissipation must remains non-negative and an elegant way to ensure this property is to construct an appropriate pseudo-potential of dissipation. In such a case, the corresponding material is said to be a Standard Generalized Material and the flow rules fulfill a normality rule (i.e. the dissipative thermodynamic forces are assumed to belong to an admissible domain and the flow of the corresponding state variables is orthogonal to the boundary of this domain). The sum of the pseudo-potential with its Legendre-Fenchel conjugate fulfills the Fenchel’s inequality and as the actual value of the dual pair forces-flows minimizes this inequality, this can be used as a convergence criterium for numerical applications. Actually, some very commonly used and effective models do not fit into that family of Standard Generalized Materials. A procedure is here proposed which permits to retrieve the normality assumption and to construct a pair of dual pseudo-potentials also for these non-standard material models. This procedure was first presented by the authors for non-associated plasticity. Now it is extended to a large range of mechanical problems.
Type de document :
Article dans une revue
Liste complète des métadonnées

Littérature citée [14 références]  Voir  Masquer  Télécharger

https://hal-enpc.archives-ouvertes.fr/hal-01157359
Contributeur : Frédérique Bordignon <>
Soumis le : jeudi 2 avril 2020 - 19:36:15
Dernière modification le : vendredi 17 juillet 2020 - 17:09:10

Fichier

Point2013.pdf
Fichiers produits par l'(les) auteur(s)

Licence


Distributed under a Creative Commons Paternité 4.0 International License

Identifiants

Citation

Nelly Point, Silvano Erlicher. Convex analysis and thermodynamics. Kinetic and Related Models , AIMS, 2013, 6 (4), pp.945-954. ⟨10.3934/krm.2013.6.945⟩. ⟨hal-01157359⟩

Partager

Métriques

Consultations de la notice

246

Téléchargements de fichiers

77