报告题目：连续位错动力学—细观尺度晶体塑性理论框架
报告人：Dr. MehranMonavari（Friedrich-Alexander-Universität Erlangen-Nürnberg）
报告时间：5月10号（周四）上午10点
报告地点：校本部HE207会议室
主办部门：太阳成集团tyc33455力学系
邀 请 人：楚海建 教授
摘要：主要介绍连续位错动力学理论，主要包括在连续尺度下如何表达位错的运动，以及如何表征位错间的相互作用。
Abstract:
Since the discovery of dislocations as carriers of plastic deformation, developing a continuum theory for motion and interaction of dislocations has been a challenging task. Such a theory should address two interrelated problems: how to represent the motion of dislocations in a continuum setting, hence the kinematics of curved and connected lines, and how to capture dislocation interactions.
In this regard, we introduce the Continuum dislocation dynamics (CDD) as a framework for representing the evolution of a system of curved and connected dislocation lines. In CDD, the microstructure is described in terms of a series of density-like tensorial variables where the accuracy can be prescribed by the resolution of the computational domain or by the order at which the tensorial series is truncated. CDD can operate on a wider spatial and temporal range than microscale models such as Discrete Dislocation Dynamics (DDD) and with a higher physical accuracy than phenomenological crystal plasticity. Therefore it is able to bridge the gap between these models. We present a mesoscale FEM crystal plasticity framework based on CDD and demonstrate its potential through few numerical examples.
