The Mechanics and Microstructural Development of Joints in Metal-Matrix Composites

本跨学科研究将探讨金属基复合材料模型接头的力学行为及其与加工过程中形成的缺陷和微观结构特征的关系。研究将集中在先进材料设计中常见的关节几何形状，包括复合材料-复合材料和复合材料-单片组合。纤维涂层将用于控制复合材料的界面特性，并发展对弱和强键合系统的末端效应的理解。重点将放在扩散连接过程中缺陷的演变和相关的微观组织特征，以及它们在接头变形、微观力学和性能中的作用。试验将在高温和环境温度下进行，并在各种加载条件下进行，其结果与为单片材料和复合材料开发的新兴本构定律相关。这项研究将有助于利用微观力学和加工科学的原理建立关节系统行为的预测模型。

This interdisciplinary research will investigate the mechanical behavior of model joints in metal matrix composites and its relationship to defects and microstructural features developed during processing. Research will focus on joint geometries commonly found in designing with advanced materials, including both composite-composite and composite-monolithic combinations. Fiber coatings will be used to control the interfacial characteristics of the composites and to develop an understanding of end effects in weakly and strongly bonded systems. Particular emphasis will be placed on the evolution of defects and relevant microstructural features during diffusion bonding, and their role in deformation micromechanics and properties of the joint. Tests will be conducted at elevated and ambient temperatures under various loading conditions and the results related to emerging constitutive laws developed for monolithic and for composite materials. This research should assist in the construction of predictive models for the behavior of joint systems using the principles of micromechanics and processing science.