Analysis of Reversed Torsion of FCC Metals Using Polycrystal Plasticity Models
Analysis of Reversed Torsion of FCC Metals Using Polycrystal Plasticity Models
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DOI：
10.1142/s1758825115500337
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发表时间：
2015-06
影响因子：
3.5
通讯作者：
Xiaoqian Guo;Huamiao Wang;Peidong Wu;X. Mao
中科院分区：
文献类型：
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作者：
Xiaoqian Guo;Huamiao Wang;Peidong Wu;X. Mao
采用基于经典Taylor模型和弹粘塑性自洽模型（EVPSC）的专用有限元方法，研究了FCC多晶在反扭过程中的大应变行为。研究发现，固定端和自由端扭转的响应对本构模型非常敏感。从应力应变曲线、斯威夫特效应和织构演化等方面对模型的预测结果与实验结果进行了比较。结果表明，所检验的模型都不能准确地预测所有的实验结果。然而，更仔细的观察表明，在考虑的模型中，切线模型给出了最差的整体性能。反向扭转过程中残余织构的强度取决于正向扭转过程中的预剪应变量和所使用的模型。
Large strain behavior of FCC polycrystals during reversed torsion are investigated through the special purpose finite element based on the classical Taylor model and the elastic-viscoplastic self-consistent (EVPSC) model with various Self-Consistent Schemes (SCSs). It is found that the response of both the fixed-end and free-end torsion is very sensitive to the constitutive models. The models are assessed through comparing their predictions to the corresponding experiments in terms of the stress and strain curves, the Swift effect and texture evolution. It is demonstrated that none of the models examined can precisely predict all the experimental results. However, more careful observation reveals that, among the models considered, the tangent model gives the worst overall performance. It is also demonstrated that the intensity of residual texture during reverse twisting is dependent on the amounts of pre-shear strain during forward twisting and the model used.