The Structure and Dynamics of Dislocations: From Atoms to the Continuum

位错的结构和动力学：从原子到连续体

• 批准号: 9414648
• 负责人: Rob Phillips
• 金额: $ 18.14万
• 依托单位: Brown University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-10-01 至 1999-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9414648&HistoricalAwards=false
• 关键词: Structure; Dynamics; Dislocations; Atoms; Continuum

9414648 Phillips This research centers around three objectives. First, the traditional Peierls model of dislocation mobility is reassessed in light of atomistic calculations. Secondly, a new experimental technique for measuring directly the interplanar shear potential is examined from the point of view of atomistic calculations of the interplanar potential. Finally a new scheme for bringing together atomistic simulation and continuum methods is explored. This will allow for the use of finite-element calculations outside of their usual province of applicability in order to study problems of dislocation mobility. The unifying theme of the research is the examination of factors governing the structure and mobility of single dislocations in a way that allows the results to be tied directly to experimentally accessible quantities, i.e., bring together atomistic and continuum approaches for the treatment of dislocation structure and dynamics. ***

这项研究围绕三个目标展开。首先，从原子计算的角度重新评价了传统的佩尔斯位错迁移率模型。其次，从面间势原子计算的角度，研究了一种直接测量面间剪切势的实验方法。最后探讨了原子模拟与连续体方法相结合的新方案。这将允许在通常的适用范围之外使用有限元计算，以便研究位错迁移问题。该研究的统一主题是检查控制单个位错的结构和流动性的因素，从而使结果直接与实验可获得的数量联系起来，即将原子和连续体方法结合起来处理位错结构和动力学。＊＊＊