Seminar by Ricardo LEBENSOHN, researcher at Los Alamos National Laboratory, Los Alamos, NM, USA, invited by Labex DAMAS

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Date | Time
07/12/2016 | 14 h 00 min - 18 h 00 min

Salle Klepaczko


“Multiscale material modelling with polycrystal plasticity at the mesoscale”

Models based on crystal plasticity are increasingly used in engineering applications to obtain microstructure-sensitive mechanical response of polycrystalline materials. Three key elements of these models are a proper consideration of the single crystal plastic deformation mechanisms, a representative description of the microstructure, and an appropriate scheme to connect the microstates with the macro response. The latter can be based on homogenization, which rely on a statistical description of the microstructure, or on full-field solutions, which requires a spatial description of the microstructure. Full-field models are computationally very intensive, preventing their direct interrogation in multiscale calculations. On the other hand, they can be used to generate reference solutions for assessment of approaches based on homogenization or semi-analytical theories. In this talk we will review our recent efforts to develop polycrystal plasticity models and validate them using emerging materials characterization methods, and the different strategies adopted to embed these models in Finite Elements, to solve problems involving complex geometries and boundary conditions with microstructure-sensitive material response.