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Title:
The nature and the mechanism of crack initiation and early growth for very-high-cycle fatigue of metallic materials - An overview
Author: Hong YS(洪友士); Sun CQ(孙成奇)
Issued Date: 2017
Conference Name: 21st European Conference on Fracture (ECF)
Conference Date: JUN 20-24, 2016
Conference Place: Catania, ITALY
Abstract: Very-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.
Keyword: HIGH-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
Indexed Type: CPCI-S ; EI
Corresponding Author: Hong, YS (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China.
Sponsorship: The 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).
Source: THEORETICAL AND APPLIED FRACTURE MECHANICS
Publisher: ELSEVIER SCIENCE BV
Publish Place: AMSTERDAM
Language: 英语
WOS ID: WOS:000417774700033
Citation statistics:
Content Type: 会议论文
URI: http://dspace.imech.ac.cn/handle/311007/72163
Appears in Collections:非线性力学国家重点实验室_会议论文

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description.institution: 1.[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:
Hong YS,Sun CQ. The nature and the mechanism of crack initiation and early growth for very-high-cycle fatigue of metallic materials - An overview[C]. 见:21st European Conference on Fracture (ECF). Catania, ITALY. JUN 20-24, 2016
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