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A MODEL OF PLASTIC SPIN TAKING INTO ACCOUNT GRAIN INTERACTION DURING ROLLING

机译:轧制过程中考虑颗粒相互作用的塑性自旋模型

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The fragmentation of grains after large and severe deformation processes is an experimental fact that still lacks an easy, computationally economical and fast simulation model. During the last years some attempts to introduce microstructural features have been successful in reproducing a few experimental results. However the price in computer time is high and localization, as seen by experiments as geometrically necessary and incidental dislocation boundaries, is still elusive. On the current paper we implement a Taylor type homogenization model allowing neighbor grains to share deformation rates and spins by simultaneous averaging in coincidence with macroscopic values. We improve a previous co-spin model allowing the whole velocity gradient, of the spin sharing grains, to be compatible with the average deformation field. Misorientation distributions are compared with literature data. The results show the characteristic lognormal distribution with a close match with the experiments until a von Mises strain of 2.0. They are discussed in terms of the microstructural influence on texture development rate and components.
机译:实验结果表明,大的和严重的变形过程后晶粒的碎裂仍然缺乏简便,计算经济和快速的仿真模型。在过去的几年中,引入微结构特征的一些尝试已成功地再现了一些实验结果。然而,计算机时间的代价很高,并且通过实验将其视为几何上必要的和偶然的位错边界的本地化仍然遥不可及。在当前的论文中,我们实现了泰勒(Taylor)型均质化模型,该模型允许通过与宏观值一致的同时平均来使相邻晶粒共享变形率和自旋。我们改进了以前的自旋模型,使自旋共享晶粒的整个速度梯度与平均变形场兼容。取向错误的分布与文献数据进行了比较。结果显示特征对数正态分布与实验非常吻合,直到von Mises应变为2.0。从微观结构对织构发展速度和成分的影响来讨论它们。

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