Hybrid free energy approach for nearly incompressible behaviors at finite strain

  • Stéphane Lejeunes
  • Dominique Eyheramendy
Original Article


We explore the formulation of nearly incompressible behaviors at finite strain in the context of a hybrid or a mixed energy. Such an energy is a function of both an isochoric deformation and a pressure-like quantity that can be considered as an internal variable. From thermodynamical and physical considerations, new energy functions are developed to correctly describe both nearly incompressible elasticity and thermoelastic behaviors. We discuss the advantages of such a formulation; in particular, we show that this approach makes it possible to unify the variational and the thermodynamical formulations in the nearly incompressible context without using Lagrange multipliers or other specific variational principles.


Thermomechanical coupling Entropic elasticity Free energy Volumetric behavior 


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© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.LMAAix-Marseille University, Centrale Marseille, CNRSMarseilleFrance

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