Fundamental Studies of Localized Plastic Deformation

本研究的目的是为了准确地理解韧性异相组织的大应变变形和破坏的微观和宏观力学描述。重点是在复合材料界面处或界面附近的变形过程以及界面的破坏。具体目标包括：(1)发展大应变、应变率相关的复合材料结构理论和预测模型；(2)将模型应用于细观组织的变形破坏；(3)金属基复合材料的变形与破坏实验研究；(4)双材料界面变形试验研究及其抗断裂性能分析；(5)加工过程中产生的残余应力对变形和破坏机制的相关影响。本研究涉及结构金属合金和复合材料，它们使用界面来控制机械行为和/或表面涂层来改善性能。

This research is aimed at a precise understanding of the micro- and macromechanical descriptions of large strain deformation and failure of ductile heterophase microstructures. Emphasis is on deformation processes at, or near, interfaces and on the failure of interfaces in composite materials. Specific objectives include (1) development of large strain, strain-rate dependent theory and predictive models for composite structures; (2) application of the models to the deformation and failure of the microstructures; (3) experimental studies of deformation and failure in metal-matrix composite materials; (4) experimental studies of deformation at bi- material interfaces and analysis of their fracture resistance; (5) related effects of residual stresses developed during the processing on deformation and failure mechanisms. %%% This research relates to structural metal alloys and composites that employ interfaces to control mechanical behavior and/or surface coatings to create improved properties.