Origin of Surface Dislocation Density Profile Developed During Cyclic Straining

循环应变期间形成的表面位错密度分布的起源

• 批准号: 8818835
• 负责人: Harold Margolin
• 金额: --
• 依托单位: Polytechnic University of New York
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-05-01 至 1992-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8818835&HistoricalAwards=false
• 关键词: Origin; Surface; Dislocation; Density; Profile

This research involves a three years study of dislocation structures developed in the near-surface regions of alpha brass by cyclic straining. This basic research explores the evolution of high dislocation density arrays and the relationship of these arrays to persistent slip band formation. The role of stacking fault energy in this process will be explored by varying the zinc content. Bauschinger and residual stresses will be studied as a function of plastic strain. The results of this research will allow development of a better understanding of fatigue crack initiation.

这项研究涉及三年的研究位错结构的发展在近表面区域的α黄铜循环应变。这项基础研究探讨了高位错密度阵列的演化以及这些阵列与持续滑移带形成的关系。堆垛层错能在这一过程中的作用将通过改变锌含量进行探讨。包辛格应力和残余应力将作为塑性应变的函数进行研究。这项研究的结果将允许开发一个更好地了解疲劳裂纹萌生。