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Investigation of high cycle and Very-High-Cycle Fatigue behaviors for a structural steel with smooth and notched specimens
Qian GA(钱桂安); Hong YS(洪友士); Zhou CE(周承恩); Hong YS
Source PublicationEngineering Failure Analysis
AbstractThe high cycle and Very-High-Cycle Fatigue (VHCF) properties of a structural steel with smooth and notched specimens were studied by employing a rotary bending machine with frequency of 52.5 Hz. For smooth specimens, VHCF failure did occur at fatigue cycles of 7.1 x 10(8) with the related S-N curve of stepwise tendency. Scanning Electron Microscopy (SEM) was used for the observations of the fracture surfaces It shows that for smooth specimens the crack origination is surface mode in the failure regime of less than 10(7) cycles While at VHCF regime, the material failed from the nonmetallic inclusion lies in the interior of material, leading to the formation of fisheye pattern. The dimensions of crack initiation region were measured and discussed with respect to the number of cycles to failure. The mechanism analysis by means of low temperature fracture technique shows that the nonmetallic inclusion in the interior of specimen tends to debond from surrounding matrix and form a crack. The crack propagates and results to the final failure. The stress intensity factor and fatigue strength were calculated to investigate the crack initiation properties. VHCF study on the notched specimens shows that the obtained S-N curve decreases continuously. SEM analysis reveals that multiple crack origins are dominant on specimen surface and that fatigue crack tends to initiate from the surface of the specimen. Based on the fatigue tests and observations, a model of crack initiation was used to describe the transition of fatigue initiation site from subsurface to surface for smooth and notched specimens. The model reveals the influences of load, grain size, inclusion size and surface notch on the crack initiation transition. (C) 2010 Elsevier Ltd. All rights reserved
KeywordVery-high-cycle Fatigue Crack Initiation Fisheye Patterns High-strength Steels Non-metallic Inclusions Chromium-bearing Steel Long-life Fatigue Low-alloy Steel Crack Initiation Quantitative-evaluation Mechanism Failure Fractography
Indexed BySCI
WOS IDWOS:000281623500002
WOS Research AreaEngineering ; Materials Science
WOS SubjectEngineering, Mechanical ; Materials Science, Characterization & Testing
Funding OrganizationNational Natural Science Foundation of China [10772178, 10532070, 10721202] ; Chinese Academy of Sciences [KJCX2-YW-L07]
Citation statistics
Cited Times:44[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorHong YS
Recommended Citation
GB/T 7714
Qian GA,Hong YS,Zhou CE,et al. Investigation of high cycle and Very-High-Cycle Fatigue behaviors for a structural steel with smooth and notched specimens[J]. Engineering Failure Analysis,2010,17(7-8):1517-1525.
APA 钱桂安,洪友士,周承恩,&Hong YS.(2010).Investigation of high cycle and Very-High-Cycle Fatigue behaviors for a structural steel with smooth and notched specimens.Engineering Failure Analysis,17(7-8),1517-1525.
MLA 钱桂安,et al."Investigation of high cycle and Very-High-Cycle Fatigue behaviors for a structural steel with smooth and notched specimens".Engineering Failure Analysis 17.7-8(2010):1517-1525.
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