On the behaviour of small fatigue cracks emanating from corrosion pits: Part I-The influence of mechanical factors

被引：31
作者：
Fatoba, Olusegun [1 ]
Akid, Robert [1 ]
机构：
[1] Univ Manchester, Corros & Protect Ctr, Dept Mat, Manchester M13 9PL, Lancs, England
来源：
THEORETICAL AND APPLIED FRACTURE MECHANICS | 2022年 / 117卷
关键词：
Corrosion pit; Pit-to-crack transition; Short cracks; Fatigue crack growth rate; Kitagawa-Takahashi diagram; Finite element analysis; ASSISTED LOCALIZED CORROSION; STRESS-CONCENTRATION; SPECIMEN THICKNESS; SMALL DEFECTS; GROWTH; INITIATION; STEEL; LIFE; PROPAGATION; TRANSITION;
D O I：
10.1016/j.tafmec.2021.103154
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The initiation and propagation behaviour of cracks emanating from corrosion pits in a high strength low alloy steel is investigated by testing pre-pitted specimens in the high cycle fatigue regime in an air environment. This was complemented with finite element analysis of electrochemically generated pit profiles. Fatigue cracks were found to initiate from the mouth of pits due likely to strain localisation at this region. Crack initiation lifetime and fatigue endurance decreased with increasing pit depth. Fatigue behaviour of the steel was found to be crack initiation dominated. A fracture mechanics methodology that provides a satisfactory estimation of critical threshold stresses and threshold stress intensity factor required for fatigue failure from corrosion pits is discussed.
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页数：18
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