US-France Cooperative Research: Investigations on DynamicalDislocation - Crack Interactions

该奖项将支持密歇根理工大学的Elias Aifantis博士和法国普瓦蒂埃物理冶金实验室的Joel Lepinoux博士之间的合作研究。该项目的目标是研究动态情况下位错-裂纹的相互作用。将考虑多种情况，包括混合加载方式，以及环境和微观结构的影响。将使用两种常用的方法：1)经典的二维位错模拟和2)非线性位错动力学。还将探讨使用元胞自动机方法的可能性。这项研究的结果可能导致一个考虑裂纹稳定性和扩展的框架，以及对断裂韧性相关现象的新的基本理解。这一项目将受益于两名调查员的互补专业知识。这两个小组多年来一直在用两种不同的方法研究位错的自组织问题：非线性动力学(美国)和元胞自动机模拟(法国)。

This award will support collaborative research between Dr. Elias Aifantis, Michigan Technological University and Dr. Joel Lepinoux, Laboratory for Physical Metallurgy, Poitiers, France. The objective of the project is the study of dislocation-crack interactions under dynamical situations. Various conditions including mixed loading modes, as well as the influence of environment and microstructure will be considered. Two general approaches will be used: 1) classical dislocation simulations in two dimensions and 2) nonlinear dislocation dynamics. The possibility of using the cellular automata method will also be explored. The results of this research may lead to a framework for considering crack stability and growth, as well as a new fundamental understanding of fracture toughness related phenomena. This project will benefit from the complementary expertise of the two investigators. Both groups have been working for several years on the problem of self organization of disloca- tions by using two different methods: nonlinear dynamics (US) and simulation with cellular automata (France).