Continuum Dislocation Dynamics

连续体位错动力学

• 批准号: 206427795
• 负责人: Professor Dr. Peter Gumbsch
• 金额: --
• 依托单位: Fachgebiet Technische Mechanik und Werkstoffkunde
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/206427795?language=en
• 关键词: Continuum; Dislocation; Dynamics

Dislocation motion as the fundamental physical mechanism of plastic deformation processes in crystalline materials is well accepted and various dislocation based models have been introduced on different length scales. Whereas averaged formulations introduce different simplifications and approximations to represent the macroscopical material behavior, discrete dislocation dynamics incorporates the stress field of each dislocation and thereby introduces a physically based simulation model. In close proximity to the discrete model a dislocation based continuum approach is followed here which is based on a direct homogenization of discrete dislocation motion. It aims at a continuum representation of dislocation motion, which results directly from physical averages of dislocation ensembles. Therefore, a central objective is to represent 3D dislocation interactions and reactions in a general continuum approach without phenomenological fitting parameters. One of our next goals is to include crucial microstructural elements in the description like grain boundaries and precipitates.

位错运动作为晶体材料塑性变形过程的基本物理机制已被广泛接受，并在不同的长度尺度上引入了各种基于位错的模型。而平均配方引入不同的简化和近似来表示宏观材料的行为，离散位错动力学结合了每个位错的应力场，从而引入了基于物理的仿真模型。在接近的离散模型的位错连续体的方法是基于离散位错运动的直接均匀化。它的目的是位错运动的连续表示，这直接从物理平均位错合奏的结果。因此，一个中心目标是代表三维位错的相互作用和反应，在一般的连续方法没有现象学拟合参数。我们的下一个目标是在描述中包括关键的微观结构元素，如晶界和沉淀物。