"Plasticity in crystals and glasses: from the atoms up"
By David Rodney, Institut Lumière Matière, University of Lyon, France
Abstract
Plasticity in crystalline metals is probably the most classical multiscale process, around which the Multiscale Materials Modeling community first organized at the end of the 1990s. Plasticity in glasses shares many similarities with their crystalline counterparts. In particular, in both cases, plasticity starts at the atomic scale, involving the motion of dislocation cores in crystals and shear transformation zones in glasses. In both cases also, elementary plastic events interact and organize at the mesoscale through elasticity. There are however specific challenges. In crystals, there is currently a need for quantitative and predictive data, which often require to start with a first principles description of atomic interactions. By way of contrast, in glasses, we are still in need of phenomenological information, which can be addressed with less computationally intensive models. But we are then faced with the high complexity of the configuration space and the energy landscape of disordered materials, making it difficult to characterize and predict simply even the most elementary plastic events. The aim of this talk will be to illustrate the challenges, recent progress and opportunities in the field of multiscale modeling of plasticity and to discuss through selected examples the links between atomic and mesoscopic descriptions of plasticity.
Speaker Biography
David Rodney is a full Professor in the Institut Lumière Matière of the University of Lyon in France. Prior to this appointment, which started in 2013, he was an Associate Professor at the Laboratory Science et Ingénierie des Matériaux et Procédés of the Institute of Technology of Grenoble. Prof. Rodney is an engineer of Paris School of Mines with a M.S. degree from Jussieu University in Paris in Solid State Physics. He received a Ph.D. in Materials Science for research performed at Brown University and the CEA Saclay, and was a post-doctoral fellow at ONERA. Prof. Rodney has been an invited researcher at MIT and the University of Chicago. His research is focused on the modeling of materials at different length and time scales, with a particular emphasis on linking elementary processes of plasticity at the atomic scale with higher-scale properties. He has published over 80 papers in scientific journals and is an editor for Acta and Scripta Materialia.
back
Abstract
Plasticity in crystalline metals is probably the most classical multiscale process, around which the Multiscale Materials Modeling community first organized at the end of the 1990s. Plasticity in glasses shares many similarities with their crystalline counterparts. In particular, in both cases, plasticity starts at the atomic scale, involving the motion of dislocation cores in crystals and shear transformation zones in glasses. In both cases also, elementary plastic events interact and organize at the mesoscale through elasticity. There are however specific challenges. In crystals, there is currently a need for quantitative and predictive data, which often require to start with a first principles description of atomic interactions. By way of contrast, in glasses, we are still in need of phenomenological information, which can be addressed with less computationally intensive models. But we are then faced with the high complexity of the configuration space and the energy landscape of disordered materials, making it difficult to characterize and predict simply even the most elementary plastic events. The aim of this talk will be to illustrate the challenges, recent progress and opportunities in the field of multiscale modeling of plasticity and to discuss through selected examples the links between atomic and mesoscopic descriptions of plasticity.
Speaker Biography
David Rodney is a full Professor in the Institut Lumière Matière of the University of Lyon in France. Prior to this appointment, which started in 2013, he was an Associate Professor at the Laboratory Science et Ingénierie des Matériaux et Procédés of the Institute of Technology of Grenoble. Prof. Rodney is an engineer of Paris School of Mines with a M.S. degree from Jussieu University in Paris in Solid State Physics. He received a Ph.D. in Materials Science for research performed at Brown University and the CEA Saclay, and was a post-doctoral fellow at ONERA. Prof. Rodney has been an invited researcher at MIT and the University of Chicago. His research is focused on the modeling of materials at different length and time scales, with a particular emphasis on linking elementary processes of plasticity at the atomic scale with higher-scale properties. He has published over 80 papers in scientific journals and is an editor for Acta and Scripta Materialia.
back