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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; Su Hang; Sun CQ(孙成奇); Hong YS(洪友士)
发表期刊INTERNATIONAL JOURNAL OF FATIGUE
2018-10-01
卷号115期号:SI页码:67-78
ISSN0142-1123
摘要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.
关键词Very-high-cycle fatigue Crack initiation Mean stress Titanium alloy Equiaxed microstructure
DOI10.1016/j.ijfatigue.2018.03.021
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收录类别SCI ; EI
语种英语
WOS记录号WOS:000449895700009
关键词[WOS]POISSON 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研究方向Engineering, Mechanical ; Materials Science, Multidisciplinary
WOS类目Engineering ; Materials Science
项目资助者National Natural Science Foundation of China [11572325] ; Strategic Priority Research Program of the Chinese Academy of Sciences [XDB22040503, XDB22020201]
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力学所作者排名1
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文献类型期刊论文
条目标识符http://dspace.imech.ac.cn/handle/311007/78139
专题非线性力学国家重点实验室
作者单位1.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
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Pan XN,Su Hang,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 Hang,孙成奇,&洪友士.(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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