A hierarchical multi-scale model for hexagonal materials taking into account texture evolution during forming simulation

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	A hierarchical multi-scale model for hexagonal materials taking into account texture evolution during forming simulation
	W. J. He; S. H. Zhang; A. Prakash; D. Helm
	2014
发表期刊	Computational Materials Science
ISSN	0927-0256
卷号	82 页码:464-475
摘要	Due to the absence of sufficient number of slip systems in hexagonal close packed (hcp) metals to accommodate arbitrary plastic deformation, mechanical twinning occupies an important role in the mechanical behavior of these metals. Twinning causes a significant and abrupt change in the orientation of crystals, whilst simultaneously affecting the hardening and plastic flow behavior of the material considerably. Modeling of forming processes of hexagonal close packed metals thus requires accounting for the evolution of texture and texture induced anisotropy, especially due to twinning. Additionally, the computational framework for the simulation of forming processes must be reliable and efficient in order to guarantee results in realistic time frames. In the present work, a phenomenological constitutive model consisting of an anisotropic yield function, associate flow rule and isotropic hardening, is coupled with the viscoplastic self-consistent polycrystal model in order to capture the slip and twinning activity, texture evolution and the evolving anisotropy during plastic deformation of hcp materials, similar to a hierarchical multi-scale modeling framework proposed by Van Houtte et al. [41] for cubic metals. To account for texture evolution during plastic deformation, the parameters involved in the anisotropic yield function are regularly updated based on mechanical test data obtained from the polycrystal model at the micro-scale. The parameter update is performed at discrete steps instead of every increment. The developed model is applied to describe the behaviors of pure zirconium at liquid nitrogen temperature. The results of the numerical simulations were found to be good agreement with experimental results, and at acceptable computation time. (C) 2013 Elsevier B.V. All rights reserved.
部门归属	[he, w. j. ; zhang, s. h.] chinese acad sci, inst met res, shenyang 110016, peoples r china. [he, w. j. ; helm, d.] fraunhofer inst mech mat iwm, d-79108 freiburg, germany. [prakash, a.] univ erlangen nurnberg, inst gen mat properties 1, dept mat sci & engn, d-91058 erlangen, germany. ; zhang, sh (reprint author), chinese acad sci, inst met res, shenyang 110016, peoples r china. ; shzhang@imr.ac.cn
关键词	Hexagonal Materials Texture Evolution Non-orthotropic Yield Function Hierarchical Multi-scale Model Embedded Model Visco-plastic Self-consistent Scheme Self-consistent Approach Finite-element Analysis Magnesium Alloy Az31 Mechanical Response Titanium-alloys Crystallographic Texture Aerospace Industry Plastic Anisotropy Zirconium Alloys Yield Criterion
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/72319
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	W. J. He,S. H. Zhang,A. Prakash,et al. A hierarchical multi-scale model for hexagonal materials taking into account texture evolution during forming simulation[J]. Computational Materials Science,2014,82:464-475.
APA	W. J. He,S. H. Zhang,A. Prakash,&D. Helm.(2014).A hierarchical multi-scale model for hexagonal materials taking into account texture evolution during forming simulation.Computational Materials Science,82,464-475.
MLA	W. J. He,et al."A hierarchical multi-scale model for hexagonal materials taking into account texture evolution during forming simulation".Computational Materials Science 82(2014):464-475.