Advanced Search
Article Contents
Article Contents

Convex analysis and thermodynamics

Abstract Related Papers Cited by
  • 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.
    Mathematics Subject Classification: Primary: 74C05, 74A15, 74A20.


    \begin{equation} \\ \end{equation}
  • [1]

    J. J. Moreau, Sur les lois de frottement, de plasticité et de viscosité, Comptes Rendus de l'Académie des Sciences, Série II, 271 (1970), 608-611 (in French).


    B. Halphen and Q. S. Nguyen, Sur les matériaux standards généralisés, Journal de Mécanique, 14 (1975), 39-63 (in French).


    S. Erlicher and N. Point, On the Associativity of the Drucker -Prager Model, VIII International Conference on Computational Plasticity - Fundamentals and Applications, Barcelona, Spain, 2005.


    S. Erlicher and N. Point, Endochronic theory, non-linear kinematic hardening rule and generalized plasticity: A new interpretation based on generalized normality assumption, International Journal of Solids and Structures, 43 (2006), 4175-4200.doi: 10.1016/j.ijsolstr.2005.03.022.


    N. Point and S. Erlicher, Pseudo-potentials and loading surfaces for an endochronic plasticity theory with isotropic damage, Journal of Engineering Mechanics ASCE, 134 (2008), 832-842.


    N. Point and S. Erlicher, Pseudo-potentials and bipotential: A constructive procedure for non-associated plasticity and unilateral contact, Discret and Continuous Dynamical Systems - Series S, 6 (2013), 567-590.


    G. de Saxcé, A generalization of Fenchel's inequality and its applications to the constitutive laws, Comptes Rendus de Académie des Sciences, Série II, 314 (1992), 125-129.


    J. F. Babadjian, G. Francfort and M. G. Mora, Quasistatic evolution in non-associative plasticity: The cap model, SIAM J. Math. Anal, 44 (2012), 245-292.doi: 10.1137/110823511.


    R. T. Rockafellar, Convex Analysis, Reprint of the 1970 original. Princeton Landmarks in Mathematics. Princeton Paperbacks. Princeton University Press, Princeton, NJ, 1997.


    H. Ziegler and C. Wehrli, The derivation of constitutive equations from the free energy and the dissipation function, Advances in Applied Mechanics, 25 (1987), 183-237.doi: 10.1016/S0065-2156(08)70278-3.


    M. Jirásek and Z. P. Bazant, Inelastic Analysis of Structures, Wyley, Chichester, 2002.


    M. Frémond, Non-Smooth Thermomechanics, Springer-Verlag, Berlin, 2002.


    J. Lemaitre and J.-L. Chaboche, Mechanics of Solid Materials, Cambridge University Press, Cambridge, 1990.

  • 加载中

Article Metrics

HTML views() PDF downloads(124) Cited by(0)

Access History

Other Articles By Authors



    DownLoad:  Full-Size Img  PowerPoint