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

这项跨学科的研究将研究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组织特征的关系。研究将集中在使用先进材料设计中常见的连接几何形状，包括复合材料-复合材料和复合材料-整体组合。纤维涂层将被用来控制复合材料的界面特征，并发展对弱结合和强结合系统中的末端效应的理解。重点介绍扩散连接过程中缺陷的演变和相关的显微组织特征，以及它们在变形微观力学和接头性能中的作用。试验将在高温和环境温度下进行，在不同的加载条件下进行，测试结果与为整体和复合材料开发的新本构定律有关。这项研究应该有助于利用微观力学和加工科学的原理来构建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.