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The behavior of crack initiation and early growth in high-cycle and very-high-cycle fatigue regimes for a titanium alloy
Pan XN(潘向南); Su H(苏杭); Sun CQ(孙成奇); Hong YS(洪友士)
Source PublicationINTERNATIONAL JOURNAL OF FATIGUE
2018-10-01
Volume115Issue:SIPages:67-78
ISSN0142-1123
Abstract

The behavior of crack initiation and early growth in high-cycle fatigue (HCF) and very-high-cycle fatigue (VHCF) regimes for a TC4 titanium alloy with equiaxed microstructure was investigated. Fatigue tests were conducted via ultrasonic axial cycling (20 kHz) superimposed by an amount of tensile load. The effect of tensile mean stress on fatigue endurance was plotted with a Haigh diagram formulated by Goodman, Gerber and the present formula. Fractography was observed by scanning electron microscopy, and three failure types of crack initiation were classified: surface-without-RA (rough area), surface-with-RA and interior-with-RA. Profile samples from the crack initiation region were prepared and examined by transmission electron microscopy with selected area electron diffraction. The observations show that a nanograin layer prevails underneath the fracture surface in the RA region only for the VHCF case with a stress ratio R = -1. The nanograin formation mechanism was explained by the numerous cyclic pressing (NCP) model.

KeywordVery-high-cycle fatigue Crack initiation Mean stress Titanium alloy Equiaxed microstructure
DOI10.1016/j.ijfatigue.2018.03.021
URL查看原文
Indexed BySCI ; EI
Language英语
WOS IDWOS:000449895700009
WOS KeywordPOISSON DEFECT STATISTICS ; COMPETING FAILURE MODES ; HIGH-STRENGTH STEELS ; TI-6AL-4V ALLOY ; STRESS RATIO ; GIGACYCLE FATIGUE ; ARTIFICIAL DEFECTS ; METALLIC MATERIALS ; FGA FORMATION ; MEAN STRESS
WOS Research AreaEngineering, Mechanical ; Materials Science, Multidisciplinary
WOS SubjectEngineering ; Materials Science
Funding OrganizationNational Natural Science Foundation of China [11572325] ; Strategic Priority Research Program of the Chinese Academy of Sciences [XDB22040503, XDB22020201]
Classification一类
Ranking1
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/78139
Collection非线性力学国家重点实验室
Affiliation1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Pan XN,Su H,Sun CQ,et al. The behavior of crack initiation and early growth in high-cycle and very-high-cycle fatigue regimes for a titanium alloy[J]. INTERNATIONAL JOURNAL OF FATIGUE,2018,115(SI):67-78.
APA Pan XN,Su H,Sun CQ,&Hong YS.(2018).The behavior of crack initiation and early growth in high-cycle and very-high-cycle fatigue regimes for a titanium alloy.INTERNATIONAL JOURNAL OF FATIGUE,115(SI),67-78.
MLA Pan XN,et al."The behavior of crack initiation and early growth in high-cycle and very-high-cycle fatigue regimes for a titanium alloy".INTERNATIONAL JOURNAL OF FATIGUE 115.SI(2018):67-78.
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