CAREER: Plasticity of Thin Metallic Sheets

建立了一种基于物理的薄板塑性变形模型的理论和实验方法。本文提出了一种用晶粒簇来表征轧制铝板的材料微观结构、表面形貌和塑性变形性能的空间均匀性的方法。基于单晶晶粒的晶体塑性理论，对晶粒团的多晶塑性模型进行了理论和实验研究。对铝合金板面内拉伸过程中表面光洁度和成形性的演变进行了实验研究和有限元分析。这些发展导致更好的模具设计和加工参数。

A theoretical and experimental approach towards a more physically based modeling of plastic deformation of thin sheets is developed. A suitable representation of spatial homogeneities of materials microstructure, surface topography, and plastic deformation properties of rolled aluminum sheet metals in terms of grain clusters is developed. Theoretical and experimental research of polycrystal plasticity models of the grain clusters based on crystal plasticity theories of single crystalline grains is performed. Experimental investigation and finite element analysis on the evolution of surface finish and formability of aluminum sheet metals undergoing in-plane stretch operation is conducted. These developments lead to a better die design and processing parameters.