An energy-equilibrium model for complex stress effect on fatigue crack initiation

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	An energy-equilibrium model for complex stress effect on fatigue crack initiation
	Zhao SC(赵思聪); Xie JJ(谢季佳); Zhao AG(赵爱国); Wu XL(武晓雷); Xie, JJ (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
发表期刊	SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
	2014-05
卷号	57 期号:5 页码:916-926
ISSN	1674-7348
摘要	Based on Tanaka and Mura's fatigue model and Griffith theory for fracture, an energy-equilibrium model was proposed to explain the complex stress effect on fatigue behavior. When the summation of the elastic strain energy release and the stored strain energy of accumulated dislocations reach the surface energy of a crack, the fatigue crack will initiate in materials. According to this model, for multiaxial stress condition, the orientation of the crack initiation and the initiation life can be deduced from the energy equilibrium equation. For the uniaxial fatigue loading with mean stress, the relation between the maximum stress or the minimum stress and the stress amplitude is in agreement with an ellipse equation on the constant life diagram. If the ratio of the mean stress to stress amplitude is less than a critical value -0.17, and the stress amplitude keeps constant, the fatigue crack initiation life will decrease with the increase of the compress mean stress. In this model, the mean stress does not cause damage accumulation with the fatigue cycles in crack initiation. For this reason, the loading sequence of different load levels would induce the cumulative damage to deviate from the Palmgren-Miner cumulative damage rule. The procedure of estimating the damage under random loading is also discussed.
关键词	Fatigue Initiation Mean Stress Effect Multiaxial Fatigue Tanaka-mura Model Damage Accumulation
学科领域	Physics
URL	查看原文
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000334561200016
项目资助者	The authors wish to thank Prof HONG Y S and Dr. SUN C Q of the Institute of Mechanics, Chinese Academy of Sciences for helpful discussions in this work. This work was supported by the National Basic Research Program of China (Grant No. 2012CB937500), and the National Natural Science Foundation of China (Grant Nos. 11072243 and 11202210).
课题组名称	LNM实验平台
论文分区	二类/Q3
引用统计	被引频次：2[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/48834
专题	非线性力学国家重点实验室
通讯作者	Xie, JJ (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
推荐引用方式 GB/T 7714	Zhao SC,Xie JJ,Zhao AG,et al. An energy-equilibrium model for complex stress effect on fatigue crack initiation[J]. SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,2014,57,5,:916-926.
APA	Zhao SC,Xie JJ,Zhao AG,Wu XL,&Xie, JJ .(2014).An energy-equilibrium model for complex stress effect on fatigue crack initiation.SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,57(5),916-926.
MLA	Zhao SC,et al."An energy-equilibrium model for complex stress effect on fatigue crack initiation".SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 57.5(2014):916-926.

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