Two-Scale Thermo-Crystal Plasticity Finite Element Analysis of Dynamic-Recrystallization Texture Evolution
Two-Scale Thermo-Crystal Plasticity Finite Element Analysis of Dynamic-Recrystallization Texture Evolution
复制标题
动态再结晶织构演化的两尺度热晶塑性有限元分析
DOI：
10.1115/imece2016-66437
复制
发表时间：
2016
影响因子：
4.1
通讯作者：
E. Nakamachi
中科院分区：
文献类型：
--
作者：
Y. Ueda;Y. Goto;Toshihiko Yamaguchi;Y. Tomita;Y. Morita;E. Nakamachi
< jats: p>为了预测铝合金成形过程中动态再结晶（DRX）织构的演变，提出了动态再结晶织构演变的预测假设，并开发了一套完整的热加工冶金模拟计算工具。它包括基于热耦合弹-晶塑性分析的双尺度有限元方法和动力显式有限元程序。它可以预测宏观尺度上的生热、扩散和塑性各向异性，以及微观尺度上由于塑性变形和生热引起的晶体织构演化，包括动态再结晶。< jats: p>计算评估的织构演变，其中包括DRX织构，在高温下的严重压缩下的极图和取向分布函数（ODF）分析的实验结果进行了比较。结果预测了实验中观察到的立方分量的演变。因此，我们提出的方法被证实有一个潜在的预测DRX纹理演变。此外，我们阐明了动态再结晶织构对颈缩、表面不稳定性和剪切带等不稳定性的影响，这些不稳定性与材料的成形性或失效密切相关。
< jats: p> In order to predict dynamic recrystallization (DRX) texture evolution during the forming processes of aluminum alloy, we propose a hypothesis to predict DRX evolution and develop a comprehensive computational tool for the thermal process metallurgy simulation. It consists of the two-scale finite element method based on the thermo-coupled elasto-crystalline plasticity analysis and the dynamic-explicit finite element procedure. It can predict the heat generation and diffusion, and plastic anisotropy at the macro-scale, and the crystal texture evolution including DRX due to the plastic deformation and heat generation at the micro-scale.< jats: p> The computationally evaluated texture evolution, which includes DRX texture, under the severe compression at high temperature is compared against the experimental results of pole figures and orientation distribution function (ODF) analyses. The results predict the evolution of the cube component which is observed in the experiments. Therefore, our proposed method is approved to have a potential predicting DRX texture evolution. Furthermore, we clarify the effect of DRX texture on the onset of such instabilities as necking, surface instability and shear bands which are closely related to the formability or failure of the materials.