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

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。 重点将放在探索的微观起源， 宏观性能，如刚度、强度和韧性。 微观起源包括组成纤维的性质 和基质，它们的几何形状，以及它们与 彼此 事实上，粘合程度将构成一个主要的 这是一个主题，围绕这一主题，许多拟议的工作都围绕着它。 的改变 纤维-基体结合被认为影响韧性 显著 特别地，键合的退化经常导致 以增加脆性基质系统的韧性。 响应于 问题是，这种退化对刚度有什么影响，比如说， 不连续纤维系统和类似的问题需要一种方法 将键降解的程度作为一个参数， 相关力学问题的连续分析。 各种手段将 探索，并提出了一些关键问题，其中纤维基质 界面起着重要的作用将被研究。

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.