Experimental study on fatigue crack growth of QSTE420TM steel with a single dwell-overload and a combined prediction model

被引：9
作者：
Gong, Hao [1 ]
Lu, Yun-chao [2 ]
Yang, Feng-peng [1 ]
Chen, Te [1 ]
机构：
[1] Shanghai Jiao Tong Univ, State Key Lab Ocean Engn, Sch Naval Architecture Ocean & Civil Engn, Shanghai 200240, Peoples R China
[2] Shanghai Electromech Engn Inst, Shanghai 201109, Peoples R China
来源：
JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH | 2021年 / 182卷
基金：
中国国家自然科学基金;
关键词：
Dwell-overload; Fatigue crack growth; Residual stress; Crack closure effect; Fatigue life; ROOM-TEMPERATURE; CREEP; BEHAVIOR; CLOSURE; RETARDATION; TIME;
D O I：
10.1016/j.jcsr.2021.106676
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
To study the fatigue crack behaviors of QSTE420TM steel under constant amplitude with a single dwell-overload, a series of experiments are performed. The dwell time changed from 0 s to 10(6) s. The result shows that the dwell overload retardation is more distinct than the single overload. The retardation degree is not proportional with the dwell time, its greatest level appears when the dwell time lasted 10(4)s, then it gradually becomes stable. A combined model, which considers the effects of both residual stress and crack closure, is proposed by introducing a dwell factor to describe the plastic zone at the crack tip. (C) 2021 Elsevier Ltd. All rights reserved.
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页数：10
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