Theoretical Studies of Subgrain Formation and the Evolution of Texture in Metals

本研究的目的是根据实验数据对硬化理论进行综合评估，通过研究其在氟化碳晶体聚集体中的有限应变织构预测，以及对塑性变形过程中渐进式亚晶形成（包括亚晶壁上的微剪切带）的基本实验现象进行数学预测和分析。实现这些目标将提供一种以前无法获得的与特定金属的织构形成有关的硬化理论的比较评估，并为随着变形的增加而持续的亚晶粒形成和微剪切带的发展提供分析基础。这项研究有潜力开发模型和本构方程，这将增强对金属大变形过程的理解，并可能导致新的计算代码的发展。这些代码可能对预测金属成形和制造过程的结果有用。＊＊＊

9414376 Havner The objectives of this research are a comprehensive assessment of hardening theories against experimental data through investigation of their finite-strain texture predictions in f.c.c. crystalline aggregates and mathematical prediction and analysis of the basic experimental phenomenon of progressive subgrain formation (including microshear bands in subgrain walls) during plastic deformation. Achievement of these objectives would provide a comparative assessment, previously unavailable, of hardening theories in relation to texture formation in specific metals and an analytical basis for continued subgrain formation and microshear- band development with increasing deformation. This study has the potential to develop models and constitutive equations that will enhance the understanding of large deformation processes in metals and could lead to the development of new computational codes. Such codes might be useful for the prediction of the results of metal forming and manufacturing processes. ***