Influence of the mean stress on the fatigue life of welded joints under variable amplitude loading

被引：7
|
作者：
Liu, Xu [1 ,2 ,3 ]
Zhang, Yan-Hui [2 ,3 ]
Wang, Bin [1 ,2 ]
Sun, Xing [3 ]
机构：
[1] Brunel Univ London, Dept Mech & Aerosp Engn, Uxbridge UB8 3PH, Middx, England
[2] TWI Ltd, Natl Struct Integr Res Ctr NSIRC, Cambridge CB21 6AL, England
[3] TWI Ltd, Fatigue Integr Management Sect, Cambridge CB21 6AL, England
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2022年 / 163卷
关键词：
Welded joints; Variable amplitude; Fatigue life; Mean stress; Residual stress; RESIDUAL-STRESS; TREATED WELDS; STRENGTH; BEHAVIOR; DESIGN;
D O I：
10.1016/j.ijfatigue.2022.106972
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The effect of the mean stress on the fatigue life of welded joints fabricated with three different plate thicknesses was investigated under variable amplitude (VA) loading. Test results indicate that Miner's sum, D, at failure increases as reducing the mean stress in the VA loading; hence, limiting D to 0.5, as advised in the fatigue design codes, may be unduly conservative in the fatigue assessment. The joint with a thinner plate is tend to have a better fatigue performance. New analytical models which can consider both mean stress and VA loading sequence effect were developed for better prediction of the fatigue life. Good agreement is observed between predictions and test results.
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页数：12
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