Basic Studies in Finite Plastic Deformation of Metal Polycrystals and Crystalline Aggregates

金属多晶和晶态聚集体有限塑性变形的基础研究

• 批准号: 9114199
• 负责人: Kerry Havner
• 金额: $ 10万
• 依托单位: North Carolina State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-09-01 至 1994-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9114199&HistoricalAwards=false
• 关键词: Basic; Studies; Finite; Plastic; Deformation

This research has as its objectives, advances in understanding and analysis of large plastic deformation of crystalline materials and improvements in predictive capability of bi-crystal and crystalline aggregate models. Two principal lines of investigation are planned: (1) analysis of texture formation in f.c.c. crystalline aggregates using experimentally-based hardening rules, including application of the theory of minimum plastic spin to resolve the long-standing non-uniqueness problem in rate-independent, uniform distortion models; and (2) detailed analysis of nonuniform shearing and lattice rotation in bi-crystals in the channel die compression test, again making use of minimum plastic spin and including comparison with experimental observations and data. In addition, studies will be initiated for the development of improved crystalline slip constitutive equations, well-founded in experiment, that include rate-dependent as well as deformation- dependent elastic ranges. Successful accomplishment of these interrelated investigations would substantially contribute to greater understanding of and accurate predictive capabilities for finite distortion and texture evolution in metal polycrystals and aggregates.

这项研究的目标是提高对晶体材料大塑性变形的理解和分析，并提高双晶和晶体聚集体模型的预测能力。 计划进行两条主要研究方向：(1) 分析 f.c.c. 中的纹理形成。使用基于实验的硬化规则的结晶聚集体，包括应用最小塑性自旋理论来解决与速率无关的均匀畸变模型中长期存在的非唯一性问题； (2) 详细分析通道模具压缩试验中双晶的不均匀剪切和晶格旋转，再次利用最小塑性旋转，并包括与实验观察和数据的比较。 此外，还将开始研究开发改进的晶体滑移本构方程，该方程在实验中得到充分证实，其中包括与速率相关的以及与变形相关的弹性范围。 这些相互关联的研究的成功完成将大大有助于更好地理解和准确预测金属多晶和聚集体中有限变形和织构演化的能力。