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

这项研究的目标是，在理解和 晶体材料的大塑性变形分析 双晶体和晶体的预测能力的改进 聚合模型 调查的两条主线是 计划：（1）分析f.c.c.中的织构形成。结晶 使用基于实验的硬化规则进行聚合，包括 应用最小塑性自旋理论求解 长期存在的非唯一性问题，在率无关，均匀 变形模型;（2）非均匀剪切的详细分析 和晶格旋转的双晶体中的通道模具压缩 测试，再次利用最小塑性旋转，包括 与实验观察和数据进行比较。 此外，本发明还提供了一种方法， 将开始研究如何改进 晶体滑移本构方程，良好的基础上， 实验，包括率依赖以及变形- 弹性范围。 成功完成这些 相互关联的调查将大大有助于 更好地理解和准确的预测能力， 金属多晶体中的有限变形和织构演化， 集料.

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.