A new constitutive analysis of hexagonal close-packed metal in equal channel angular pressing by crystal plasticity finite element method
A new constitutive analysis of hexagonal close-packed metal in equal channel angular pressing by crystal plasticity finite element method
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DOI：
10.1007/s00161-017-0583-9
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发表时间：
2018
影响因子：
2.6
通讯作者：
Hejie Li;A. Öchsner;P. Yarlagadda;Yingping Xiao;T. Furushima;D. Wei;Zhengyi Jiang;K. Manabe
中科院分区：
文献类型：
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作者：
Hejie Li;A. Öchsner;P. Yarlagadda;Yingping Xiao;T. Furushima;D. Wei;Zhengyi Jiang;K. Manabe
六方密排金属大多数是轻金属。随着轻金属制品应用的日益广泛，轻金属的生产越来越受到世界各国研究者的重视。为了更好地理解HCP金属（特别是镁及其合金）的变形机制，在前人研究的基础上，提出了一种新的HCP金属本构分析方法。本文结合应变梯度理论和连续介质力学理论，分析了镁合金等径角挤压过程，建立了镁合金等径角挤压的HCP晶体塑性本构模型。将高温对镁合金变形机制（滑移和孪晶）的影响引入到晶体塑性本构模型中。新开发的本构模型的解决方案是建立在拉格朗日迭代和牛顿-拉夫逊简化的基础上。
Most of hexagonal close-packed (HCP) metals are lightweight metals. With the increasing application of light metal products, the production of light metal is increasingly attracting the attentions of researchers worldwide. To obtain a better understanding of the deformation mechanism of HCP metals (especially for Mg and its alloys), a new constitutive analysis was carried out based on previous research. In this study, combining the theories of strain gradient and continuum mechanics, the equal channel angular pressing process is analyzed and a HCP crystal plasticity constitutive model is developed especially for Mg and its alloys. The influence of elevated temperature on the deformation mechanism of the Mg alloy (slip and twin) is novelly introduced into a crystal plasticity constitutive model. The solution for the new developed constitutive model is established on the basis of the Lagrangian iterations and Newton Raphson simplification.