IMECH-IR  > 非线性力学国家重点实验室
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
Pages67-78
Conference Name4th IJFatigue and FFEMS Joint Workshop on Characterisation of Crack Tip Fields
Conference DateAPR 10-12, 2017
Conference PlaceBonifacio, FRANCE
AbstractThe 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
WOS IDWOS:000449895700009
Funding OrganizationNational Natural Science Foundation of China [11572325]; Strategic Priority Research Program of the Chinese Academy of Sciences [XDB22040503, XDB22020201]
Indexed ByCPCI-S
Language英语
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Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type会议论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/78556
Collection非线性力学国家重点实验室
AffiliationChinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China、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[C],2018:67-78.
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