A general scenario of fish-eye crack initiation on the life of high-strength steels in the very high-cycle fatigue regime

被引：28
|
作者：
Wang, Chong [1 ,2 ]
Liu, Yongjie [1 ,2 ]
Nikitin, Alexander [3 ]
Wang, Qingyuan [1 ,2 ]
Zhou, Min [4 ,5 ]
机构：
[1] Sichuan Univ, Minist Educ, Key Lab Deep Underground Sci & Engn, Chengdu 610065, Sichuan, Peoples R China
[2] Sichuan Univ, Failure Mech & Engn Disaster Prevent & Mitigat Ke, Chengdu, Sichuan, Peoples R China
[3] Russian Acad Sci, Inst Comp Aided Design, Moscow, Russia
[4] Georgia Inst Technol, Sch Mech Engn, Atlanta, GA 30332 USA
[5] Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA
来源：
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES | 2019年 / 42卷 / 09期
基金：
中国国家自然科学基金;
关键词：
fatigue cracking threshold; internal crack; irreversible cyclic slip; subsurface crack initiation; very high-cycle fatigue; GIGACYCLE FATIGUE; BEARING STEEL; FORMATION MECHANISM; EARLY GROWTH; PART I; BEHAVIOR; DAMAGE; IRON; MICROSTRUCTURE; TEMPERATURE;
D O I：
10.1111/ffe.13104
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
When high-strength steels are subjected to very high-cycle fatigue loading, crack initiation site shifts from surfaces to the interior, and a fish-eye forms on the fracture surface. Majority of the fatigue life is estimated to be associated with the formation of this internal crack morphology. In the present work, features of such internal cracks in two high-strength steels are studied. Specifically, three initiation patterns are investigated. A general internal crack initiating scenario is proposed base on an understanding of dislocation slip in the materials. A simplified threshold is calculated from Young's modulus and interatomic spacing, defining the transition from the initiation stage to the crack propagation. The relationship between internal crack initiation and slower descending S-N curves is discussed.
引用
收藏
页码：2183 / 2193
页数：11
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