Publications

2012

• Inconel 718 single and multipass modelling of hot forging
  
  • de Jaeger Julien
  • Solas Denis
  • Baudin Thierry
  • Fandeur Olivier
  • Schmitt Jean-Hubert
  • Rey Colette
  , 2012.
• Numerical Study of Fluid-Structure Interactions in Tube Bundles With Multiphase-POD Reduced-Order Approach
  
  • Pomadere Marie
  • Liberge Erwan
  • Hamdouni Aziz
  • Longatte Elisabeth
  • Sigrist Jean-François
  , 2012, pp.137-146. Fluid-Structure Interactions are present in a large number of systems of nuclear power plants and nuclear on-board stoke-holds. Particularly in steam generators, where tube bundles are submitted to cross-flow which can lead to structure vibrations. We know that numerical studies of such a complex mechanism is very costly, that is why we propose the use of reduced-order methods in order to reduce calculation times and to make easier parametric studies for such problems. We use the multiphase-POD approach, initially proposed by Liberge (E. Liberge; POD-Galerkin Reduction Models for Fluid-Structure Interaction Problems, PhD Thesis, Universite de La Rochelle, 2008). This method is an adaptation of the classical POD approach to the case of a moving structure in a flow, considering the whole system (fluid and structure) as a multiphase domain. We are interested in the case of large displacements of a structure moving in a fluid, in order to observe the ability of the multiphase-POD technique to give a satisfying solution reconstruction. We obtain very interesting results for the case of a single circular cylinder in cross-flow (lock-in phenomenon). Then we present the application of the method to a case of confined cylinders in large displacements too. Here again, results are encouraging. Finally, we propose to go further presenting a first step in parametric studies with POD-Galerkin approach. We only consider a flowing-fluid around a fixed structure and the Burgers’ equation. A future work will consist in applications to fluid-structure interactions. (10.1115/ESDA2012-82462)
  DOI : 10.1115/ESDA2012-82462
• Bond slip model for the simulation of reinforced concrete structures
  
  • Casanova Anaelle
  • Jason Ludovic
  • Davenne Luc
  Engineering Structures, Elsevier, 2012, 39, pp.66--78. This paper presents a new finite element approach to model the steel-concrete bond effects. This model proposes to relate steel, represented by truss elements, with the surrounding concrete in the case where the two meshes are not necessary coincident. The theoretical formulation is described and the model is applied on a reinforced concrete tie. A characteristic stress distribution is observed, related to the transfer of bond forces from steel to concrete. The results of this simulation are compared with a computation in which a perfect relation between steel and concrete is supposed. It clearly shows how the introduction of the bond model can improve the description of the cracking process (finite number of cracks). (10.1016/j.engstruct.2012.02.007)
  DOI : 10.1016/j.engstruct.2012.02.007
• Damage localization and rupture with gradient damage models
  
  • Pham Kim
  • Marigo J.-J.
  Array, ICMA, 2012, 6 (19). (10.3221/IGF-ESIS.19.01)
  DOI : 10.3221/IGF-ESIS.19.01
• Chaînages de code amont et aval à la simulation numérique du soudage pour optimiser les structures soudées
  
  • Asserin Olivier
  • Gilles Philippe
  • Afzali Mansour
  • Bastid Philippe
  • Carpreau Jean-Michel
  • Deloison Dominique
  • Feulvarch Éric
  • Journet Bertrand
  • Corret Michel
  • Lawrjaniec Didier
  Matériaux et Techniques, EDP Sciences [1970-....], 2012, 100 (4), pp.289-290. (10.1051/mattech/2012046)
  DOI : 10.1051/mattech/2012046