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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.
Source PublicationSCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
2014-05
Volume57Issue:5Pages:916-926
ISSN1674-7348
AbstractBased 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.
KeywordFatigue Initiation Mean Stress Effect Multiaxial Fatigue Tanaka-mura Model Damage Accumulation
Subject AreaPhysics
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Indexed BySCI ; EI
Language英语
WOS IDWOS:000334561200016
Funding OrganizationThe 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).
DepartmentLNM实验平台
Classification二类/Q3
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/48834
Collection非线性力学国家重点实验室
Corresponding AuthorXie, JJ (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
Recommended Citation
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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