Asymptotic Methods for Deformation Processing

9322714约翰逊这项研究工作的目标是通过渐近方法为变形处理开发解析解。这样的模型将提供一个丰富的环境，在其中探索加工替代方案。这项工作将与工业界合作完成。变形加工的两个领域将被模拟，热轧，特别是反向未命中，和薄壁挤压。有限元分析的结果将用于验证解析解。热轧薄板厂的工作主要是为了评估穿透厚度和热效应。研究分为轧辊表面热边界层引起的热效应和温度相关本构关系两个方面，以及基于广义平面应变的厚板三维轧制模型。这项关于挤压的工作将是渐近方法的非标准应用，旨在开发一种薄壁挤压模具设计工具。这项研究成果的应用将包括热可逆式轧机和热连续式轧机。缺乏良好的变形加工模型一直是这些加工过程优化和控制的限制因素。

9322714 Johnson The objective of this research effort is to develop analytical solutions, by means of asymptotic methods, for deformation processing. Such models will provide a rich environment in which to explore processing alternatives. The work will be done in collaboration with industry. Two areas of deformation processing will be modeled, hot mill rolling, particularly reversing miss, and thin section extrusion. Results from finite element analyses will be used to validate the analytical solutions. The work on hot sheet rolling mills is primarily aimed at evaluating through- thickness and thermal effects. The study is divided into two areas, thermal effects resulting from roll surface thermal boundary layers and temperature dependent constitutive behavior, and a thick slab, three-dimensional rolling model based on generalized plane strain. The work on extrusion will be a non-standard application of asymptotic methods aimed at developing a die design tool for thin section extrusion. The application of results obtained from this research will include both hot reversing mills and hot continuous mills. The lack of good models for deformation processing has been a limiting factor in the optimization and control of these processes.