LMA - Laboratoire de Mécanique et d’Acoustique

Theme Multiphysic couplings

The research efforts are focused on the study and the modeling of the material behavior in circumstances where mechanical characteristic (strains and stresses for instance) are strongly influenced (and reciprocally) by other physics. The primary one is the temperature that is taken into account in all the studies of this topic (thermomechanical couplings). Chemical potentials are also considered in some studies (thermo-chemo-mechanical couplings).

Scientific objectives

  • Thermo-chemo-mechanical coupling: characterizing and modeling the chemo/thermo/mechanical interactions in dissipative elastomers and their influence on the material behavior.
  • Tribological surface transformations: determining the origins of the near-surface nature of these metallurgical transformations. Integration of these transformations in a thermodynamically consistent model and implementation in a finite element code.
  • Behavior of the uranium dioxyde (UO2) at high strain rates: experimental characterization of UO2 behavior at various strain rates and temperatures. Modification of previous models to the case of high strain rates and implementation in a finite element code.
  • New advanced software concepts for multi-physics problems
  • Numerical methods for solving multi-physics problems

Topics addressed

  • Thermo-Chemo-Mechanical framework in finite strain for constitutive modeling.
  • Numerical implementation of Thermo-Chemo-Mechanical coupled problems in a finite elements code
  • Tribological surface transformation of SNCF rails.
  • Reactivity initiated accident (RIA) in pressurized water reactors.
  • Thermo-elasto-hydrodynamic contact interaction with non Newtonian fluids (punctual and surface contacts)

Contribution to socio-economical aspects

Development of specific applications

  • Space: evolution of critic mechanical characteristic during the life time of a sub-structure.
  • Railway: surface damage of rails
  • Energy: behavior of nuclear fuel, reactivity initiated accident (RIA)

Collaborations

  • Academic: Lebanese American Univ. (Lebanon), École Polytechnique de Da Nang (Vietnam), Univ. Lyon I (Institut Camille Jordan, Lyon, France), INSA de Lyon (LAMCOS, Lyon, France)
  • National labs and industrial partners: CEA-Cadarache, RATP, SNCF.

Members

Thierry DESOYER Dominique EYHERAMENDY garrigues Frédéric LEBON Stéphane LEJEUNES