Fundamental Fracture Mechanisms in Ductile Single Crystals: A Combined Analytical and Experimental Study

延性单晶的基本断裂机制：分析与实验相结合的研究

• 批准号: 9800157
• 负责人: Walter Drugan
• 金额: $ 15万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-06-01 至 2002-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9800157&HistoricalAwards=false
• 关键词: Fundamental; Fracture; Mechanisms; Ductile; Single

A methodical approach to elucidate and characterize the fundamental micromechanical fracture mechanisms in ductile single crystals is developed. There is an increasing production of entire structural and electronic components in single crystal form to eliminate grain-boundary flaws and enhance high-temperature performance. The features of stationary crack tip field that lead to growth are identified. The effects of repeated loading cycles on stationary crack stress and deformation fields are investigated. The stress and deformation fields near a growing crack are determined to create an overall picture of how failure occurs in ductile single crystals. The experimental program uses the Moire Microscope while leading and second order asymptotic analysis of a single crystal elasto-plasticity formulation is developed for the theoretical analysis.

一种阐明和表征延性单晶材料基本微观断裂机制的方法 晶体是发达的。 单晶形式的整个结构和电子部件的生产越来越多，以消除晶界缺陷并增强其性能。 高温性能。 的特征 固定 导致裂纹扩展裂纹尖端场 被识别。 反复加载循环对稳态 裂纹 应力和变形 领域 被调查。 应力和变形场附近的一个不断增长的裂纹被确定，以创建一个整体的图片， 断裂发生在延展性单晶中。 实验方案采用莫尔显微镜同时对单晶进行了超前和二阶渐近弹塑性分析 制剂 是 发达 为 理论分析。