Development of Constitutive Equations and Processing Maps Using Dynamic Modeling Approach

使用动态建模方法开发本构方程和处理图

• 批准号: 8708700
• 负责人: Suren Dwivedi
• 金额: $ 3万
• 依托单位: University of North Carolina at Charlotte
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-08-01 至 1989-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8708700&HistoricalAwards=false
• 关键词: Development; Constitutive; Equations; Processing; Maps

In this project constitutive equations and processing maps using a dynamic modeling approach will be developed for metal forming processes. Inconel Alloy 718 will be used as the work material. This alloy is selected because of its extensive application in areas requiring high strength, corrosion resistance and weldability in aged condition. A computer program will be used to calculate an array of values, giving the desired ram position as a function of time for particular combinations of strain rate and specimen height. Effective stress and effective strain-rate values will be extracted at various strain levels and test temperatures from flow curves; constitutive equations will be derived therefrom. Processing maps will be developed to describe the intrinsic workability of each material and to evaluate the dissipative/metallurgical processes occurring during hot deformation in the stable and unstable regions, and to identify in the stable region the optimum temperature and strain-rate range for processing the materials. This research is important in the area of metal forming and has immediate potential applications.

在这个项目中，将开发金属成形过程的本构方程和使用动态建模方法的过程图。将使用Inconel合金718作为工作材料。这种合金之所以被选中，是因为它广泛应用于时效条件下对强度、耐腐蚀性和焊接性要求较高的领域。计算机程序将被用来计算一组数值，对于应变率和试件高度的特定组合，给出作为时间函数的所需柱塞位置。从流动曲线中提取不同应变水平和试验温度下的有效应力和有效应变率值，并由此导出本构方程。将制定加工图，以描述每种材料的内在可加工性，评估在稳定区和不稳定区的热变形过程中发生的耗散/冶金过程，并在稳定区确定加工材料的最佳温度和应变速率范围。这项研究在金属成形领域具有重要意义，具有直接的潜在应用价值。