基于微结构演化的金属材料塑性本构模型研究

项目名称： 基于微结构演化的金属材料塑性本构模型研究

项目编号： No.U1330121

项目类型： 联合基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 孙朝阳

作者单位： 北京科技大学

项目金额： 80万元

中文摘要： 材料在多微观机制联合作用下的塑性变形机理及其激活、演化规律的力学行为是目前塑性力学领域的研究热点之一。本项目拟结合典型晶体结构（FCC、BCC、HCP）金属塑性变形过程的宏细观特征实验，基于位错动力学理论建立位错与孪晶、晶界、空位等相互作用的特征微元描述及细观本构模型。系统分析塑性变形过程细观各机制激活、演化的规律；获得金属塑性变形的实时动态结构演变过程及损伤过程。揭示金属塑性变形的微观机制，探索金属塑性变形微观结构演化的新规律和新机制。

中文关键词： 塑性变形；位错动力学；微结构；本构模型；

英文摘要： The mechanism of plastic deformation of the material under the combined effects of multiple microscopic mechanisms and its activation, the evolution of the mechanical behavior is the plastic mechanics research in the field of one of the hot issue. The project intends to combine macro-micro features of experiments during plastic deformation process for the typical metal with crystal structure (FCC, BCC、HCP), based on the dislocation dynamics theory to establish the characteristics of the interaction of dislocations and twins, grain boundaries, vacancies micro-mechanism description and microscopic constitutive model, analysis the mechanisms of various microstructures activated and the law of various microstructures evolution during the plastic deformation process. Evolution of the real-time dynamic structure of the plastic deformation of metals and damage process is studied, the microscopic mechanism of plastic deformation of metals is discovered, and the plastic deformation of metals microstructure evolution new laws and new mechanisms is explored.

英文关键词： plastic deformation；dislocation dynamics；microstructure；constitutive model；