Presidential Young Investigator Award: Micro-Mechanics of Fiber-Reinforced Composites

总统青年研究员奖：纤维增强复合材料的微观力学

• 批准号: 8451080
• 负责人: Paul Steif
• 金额: $ 31.2万
• 依托单位: Carnegie-Mellon University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1985
• 资助国家: 美国
• 起止时间: 1985-07-15 至 1991-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8451080&HistoricalAwards=false
• 关键词: Presidential; Young; Investigator; Award; Micro

The mechanical properties of fiber-reinforced composite materials will be studied theoretically within the framework of continuum mechanics. Emphasis will be placed on exploring the microscopic origins of macroscopic properties such as stiffness, strength, and toughness. Microscopic origins include the properties of the constituent fibers and matrix, their geometry, and the extent to which they are bonded to one another. In fact, the degree of bondedness will constitute a major theme around which much of the proposed work revolves. Alterations in the fiber-matrix bond have been thought to affect toughness significantly. In particular, degradation of the bond frequently leads to increased toughness in brittle matrix-systems. Response to the question, What effect does such degradation have on stiffness in, say, discontinuous fiber systems? and to similar questions requires a means of incorporating the degree of bond degradation as a parameter into continuum-analyses of relevant mechanics problems. Various means will be explored, and a number of key problems in which the fiber-matrix interface plays a significant role will be studied.

纤维增强复合材料的力学性能将在连续介质力学的框架内进行理论研究。重点将放在探索宏观性质的微观起源，如刚度，强度和韧性。微观起源包括组成纤维和基质的性质，它们的几何形状，以及它们彼此结合的程度。事实上，化学键的程度将构成一个主要的主题，许多拟议的工作将围绕这个主题展开。纤维-基体结合的改变被认为对韧性有显著影响。特别是，在脆性基体体系中，粘结的降解经常导致韧性的增加。在不连续纤维系统中，这种退化对刚度有什么影响？而要解决类似的问题，则需要一种将粘结退化程度作为参数纳入相关力学问题连续分析的方法。将探索各种方法，并研究纤维-基质界面发挥重要作用的一些关键问题。