IMECH-IR  > 非线性力学国家重点实验室
The nature and the mechanism of crack initiation and early growth for very-high-cycle fatigue of metallic materials - An overview
Hong YS(洪友士); Sun CQ(孙成奇); Hong, YS (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China.
Source PublicationTHEORETICAL AND APPLIED FRACTURE MECHANICS
2017
Conference Name21st European Conference on Fracture (ECF)
Conference DateJUN 20-24, 2016
Conference PlaceCatania, ITALY
AbstractVery-high-cycle fatigue (VHCF) is the fatigue damage and failure beyond 107 loading cycles. Crack initiation of VHCF for metallic materials is commonly from the interior of specimens and possesses a unique feature of fish-eye (FiE) containing a fine-granular-area (FGA). It is regarded that FGA together with FiE is the characteristic region of crack initiation for VHCF, because it consumes more than 95% of total fatigue life and the value of stress intensity factor range for this region keeps constant for a given material. The aim of this overview is to summarize the research progress on the crack initiation characteristics and the related mechanisms for VHCF of metallic materials. After a brief introduction to the origination of VHCF research in 1980s, this overview contains the following parts: Characteristics of crack initiation region for VHCF, Characteristic region and intrinsic dimensions of crack initiation for VHCF, The formation mechanism and the model of crack initiation region, The new model of Numerous Cyclic Pressing to explain the formation mechanism of FGA, and Verification of proposed NCP model. In the descriptions, the two essential aspects are especially focused: the nature of crack initiation region for VHCF, and the mechanism for the formation of crack initiation region. (C) 2017 Elsevier Ltd. All rights reserved.
KeywordHigh-strength Steels Chromium-bearing Steel Regime N-greater-than-10(7) Cycles Severe Plastic-deformation Ion Mass-spectrometry Long-life Fatigue Very-high-cycle Fatigue Fatigue Crack Initiation Fine-granular-area Nanograins High-strength Steels Titanium Alloyss-n Curve Ti-6al-4v Alloy Propagation Mechanism Ultrasonic Frequency
WOS IDWOS:000417774700033
Funding OrganizationThe authors would like to appreciate the financial supports from the National Natural Science Foundation of China (11572325) and from the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB22040503, XDB22020201).
Indexed ByCPCI-S ; EI
Language英语
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Cited Times:25[WOS]   [WOS Record]     [Related Records in WOS]
Document Type会议论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/72163
Collection非线性力学国家重点实验室
Corresponding AuthorHong, YS (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China.
Affiliation1.[Hong, Youshi] Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Hong YS,Sun CQ,Hong, YS . The nature and the mechanism of crack initiation and early growth for very-high-cycle fatigue of metallic materials - An overview[C]. AMSTERDAM:ELSEVIER SCIENCE BV,2017.
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