Functionally Graded Materials: Failure Characterization Using Optical Techniques

功能梯度材料：使用光学技术进行故障表征

• 批准号: 9622055
• 负责人: Hareesh Tippur
• 金额: $ 14.66万
• 依托单位: Auburn University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-10-01 至 2000-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9622055&HistoricalAwards=false
• 关键词: Functionally; Graded; Materials; Failure; Characterization

Tippur 9622055 The proposed research is aimed at developing a fundamental knowledge base concerning mechanical integrity, particularly fracture, in a class of new materials called Functionally Graded Materials (FGM). Failure characterization and performance evaluation relative to piecewise-homogeneous compositions and identification of appropriate materials property gradients for best performance are currently lacking. The proposed research will provide full-field information about the nature of stresses and deformations near cracks in FGMs under quasi-static and dynamic loading conditions. A relatively new optical technique called "Coherent Gradient Sensing" (CGS) will be used for the direct measurement of crack tip displacement components and of the local mixed-mode deformations as a function of the applied loading. ***

拟议的研究旨在开发一个关于机械完整性的基础知识基础，特别是断裂，在一类称为功能梯度材料（FGM）的新材料中。目前缺乏与分段均匀成分相关的失效表征和性能评估以及最佳性能的适当材料性能梯度的识别。提出的研究将提供有关准静态和动态加载条件下fgm裂纹附近应力和变形性质的全方位信息。一种称为“相干梯度传感”（CGS）的相对较新的光学技术将用于直接测量裂纹尖端位移分量和局部混合模变形作为应用载荷的函数。＊＊＊