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The numerical modeling of metallic materials at the mesoscopic scale

Marc Bernacki, Mines ParisTech Professor and researcher at the CEMEF, will give a lecture about "recent advances concerning the numerical modeling of metallic materials at the mesoscopic scale" on thursday 11th january.
Léonard de Vinci Building, e-media amphitheater
Add to my Calendar01/11/2018 1:30pm 01/11/2018 3:00pm The numerical modeling of metallic materials at the mesoscopic scale Léonard de Vinci Building, e-media amphitheater Europe/Paris public

The mechanical properties and behaviour of metallic materials mainly depend on the content and structure of dislocations network, this points out the need to incorporate microstructure concepts into the numerical models.
The goal is to correctly describe the main physical mechanisms occurring in metals during thermomechanical processes i.e. work-hardening, recovery, grain boundary migration, nucleation and grain growth related to dynamic, static or metadynamic recrystallization, phase transformation, ductile damage mechanisms...

Macroscopic and homogenized models, the so-called mean-field models, are widely used in the industry, mainly due to their low computational cost. If this mean field framework is quite convenient, it can be synonymous, for a given material, with a large amount of experiments with advanced laboratory devices.
Moreover, the homogenization of the microstructure does not usually enable to capture local events. Over the last decades, mesoscopic numerical methods (called full field models) have been developed in order to simulate explicitly the microstructure evolutions and to build a bridge with lower-scale approaches like dislocation dynamics or molecular dynamics. The idea behind these mesoscale simulations and the concept of digital material is that the morphology and the topology of the microstructure characteristics must be taken into account to develop accurate and reliable simulations.
Some trends in terms of development of these numerical methods will be illustrated before focusing on our recent efforts, concentrated on the DIGIMU industrial consortium and the homonym industrial ANR Chair, to shift from laboratory-centred modelling activities to helping industry equip itself with advanced modelling tools and skills concerning this domain.