POSTPONED - 18th IUTAM Summer School on “Mechanics of Nanocrystalline Materials: From Discrete to Continuum”
September 10, 2012 — September 14, 2012
- Mohammed Cherkaoui (Georgia Tech, Atlanta, GA, USA)
- David McDowell (Georgia Tech, Atlanta, GA, USA)
This event has been postponed. It will not start on September 10, 2012.
Since their discovery in the early 1980s, Nanocrystalline (NC) materials have been the subject of great attention for they revealed unexpected fundamental phenomena, such as the breakdown of the Hall-Petch law, and suggested the possibility of reaching the ever-so-challenging large-ductility/high-yield stress compromise. Although the problem of describing the behavior of NC materials is still challenging, numerous fundamental, computational, and technological advances have been accomplished since then.
The mechanical behavior of NC materials has been subject to numerous investigations, most of which are focused on the role of interfaces (grain boundaries and triple junctions) and aimed at identifying the mechanisms responsible for the breakdown of the Hall-Petch relation. Within this context, the mechanical behavior of NC relies on a generic idea in which grain boundaries serve as softening structural elements providing the effective action of the deformation mechanisms in NC. Therefore any modeling attempt toward the behavior of NC faces the problem of identification of the softening deformation mechanisms inherent in grain boundaries as well as the description of their competition with conventional lattice dislocation motion.
In the context of NC, this course aims at discussing a complete and rigorous state-of-the-art analysis of the modeling of the mechanical behavior of NC materials. Among other key topics the material focuses on the novel techniques used to predict the mechanical behavior of this category of nanostructured materials. Particular attention is given to recent theoretical and computational frameworks combining atomistic and continuum approaches. Also, the most relevant deformation mechanisms governing the response of NC materials are addressed and discussed in correlation with available experimental data.
The lecturers will present novel models describing plastic deformation processes occurring in NC materials, including grain boundary dislocation emission and grain boundary sliding. They will cover scale transitions from atomistic to continuum, and will show how to construct and use a molecular dynamics code for practical use in the modeling of NC materials, in addition to atomistic to continuum modeling schemes.
The course will cover a wide spectrum of materials, including: new modeling techniques and their potential applications and possible extensions, such as molecular dynamics, strain gradient based finite element simulations, and novel micromechanical schemes describing plastic deformation processes occurring in NC materials including grain boundary dislocation emission.
The course is addressed to researchers, including graduate students who are either entering these fields for the first time or actively conducting research in this area and intending to extend their knowledge of nanostructured materials.
KEYWORDS: Nanocrystalline Materials, Deformation Mechanisms, Plastic Deformation, Multiscale Modelling, Heterogeneous Metallic, Materials.