Micromechanics based fatigue life prediction of a polycrystalline metal applying crystal plasticity

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	Micromechanics based fatigue life prediction of a polycrystalline metal applying crystal plasticity
	Zhang KS; Ju JW; Li ZH; Bai YL(白以龙); Brocks W
刊名	MECHANICS OF MATERIALS
	2015-06
通讯作者邮箱	kszhang2002@hotmail.com
卷号	85 页码:16-37
关键词	Crystal slipping Cyclic plasticity Statistical RVE model Inhomogeneous strain Symmetrical strain cycle Low-cycle fatigue life
ISSN号	0167-6636
其他题名	MECHANICS OF MATERIALS
通讯作者	Zhang, KS (reprint author), Guangxi Univ, Coll Civil & Architectural Engn, Key Lab Disaster Prevent & Struct Safety, Nanning 530004, Peoples R China.
产权排序	[Zhang, Ke-Shi; Ju, J. Woody] Guangxi Univ, Coll Civil & Architectural Engn, Key Lab Disaster Prevent & Struct Safety, Nanning 530004, Peoples R China; [Ju, J. Woody] Univ Calif Los Angeles, Dept Civil & Environm Engn, Los Angeles, CA 90095 USA; [Li, Zhenhuan] Huazhong Univ Sci & Technol, Dept Mech, Wuhan 430074, Peoples R China; [Bai, Yi-Long] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100080, Peoples R China; [Brocks, Wolfgang] Univ Kiel, Inst Mat Sci, Kiel, Germany
中文摘要	The fatigue-life of a polycrystalline superalloy under symmetrical cyclic strain controlled loading at a temperature of 650 degrees C is investigated by numerical simulations on the micro-level, focusing on the inhomogeneous evolution of plastic deformation in a polycrystalline aggregate. A methodology (Zhang et al., 2011, 2013) to predict the low-cycle fatigue life by micro-level simulations along with statistical analysis is applied following the steps: (1) A statistically representative volume element (RVE) consisting of a number of crystal grains is constructed by Voronoi tessellation. Stresses and plastic strains are calculated by a crystal plasticity model including nonlinear kinematic hardening. (2) The RVE is subjected to repeated symmetric tensile-compressive loading. (3) The inhomogeneous stress and strain fields are statistically analyzed during the load cycles. (4) Failure by LCF is strain controlled and occurs if either of the quantities, standard deviation of longitudinal strain in tensile direction, maximum or statistical average of first principal strains in the RVE at the tension peak of cyclic loading reaches a respective critical value. (5) Using the present methodology, a family of failure curves for fatigue lives under different strain amplitudes can be predicted by varying the critical values. Finally, appropriate critical values can be identified by a respective cyclic experiment with only one strain amplitude. (C) 2015 Elsevier Ltd. All rights reserved.
分类号	一类
类目[WOS]	Materials Science, Multidisciplinary ; Mechanics
研究领域[WOS]	Materials Science ; Mechanics
关键词[WOS]	LOW-CYCLE FATIGUE ; EFFECTIVE ELASTOPLASTIC BEHAVIOR ; MATRIX COMPOSITES ; CRACK NUCLEATION ; INTEGRATION ALGORITHM ; SINGLE-CRYSTALS ; STRAIN ; MICROSTRUCTURE ; DEFORMATION ; MODEL
收录类别	SCI ; EI
原文出处	http://dx.doi.org/10.1016/j.mechmat.2015.01.020
语种	英语
WOS记录号	WOS:000353095600003
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/49983]
专题	力学研究所_非线性力学国家重点实验室
推荐引用方式 GB/T 7714	Zhang KS,Ju JW,Li ZH,et al. Micromechanics based fatigue life prediction of a polycrystalline metal applying crystal plasticity[J]. MECHANICS OF MATERIALS,2015,85:16-37.
APA	Zhang KS,Ju JW,Li ZH,白以龙,&Brocks W.(2015).Micromechanics based fatigue life prediction of a polycrystalline metal applying crystal plasticity.MECHANICS OF MATERIALS,85,16-37.
MLA	Zhang KS,et al."Micromechanics based fatigue life prediction of a polycrystalline metal applying crystal plasticity".MECHANICS OF MATERIALS 85(2015):16-37.