Experimental characterization of the bending fatigue strength of threaded fasteners

被引：22
|
作者：
Wentzel, Henrik [1 ]
Huang, Xiyue [1 ]
机构：
[1] Royal Inst Technol KTH, Dept Solid Mech, SE-10044 Stockholm, Sweden
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2015年 / 72卷
关键词：
Fatigue; Bolt; Bending; Weakest link; Volume effect;
D O I：
10.1016/j.ijfatigue.2014.11.005
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The fatigue strength in bending of pre-stressed steel bolts is investigated and compared to the fatigue strength in axial tension. The strength is measured in terms of maximum engineering stress amplitude, neglecting any stress concentration in the threads. The experimental results reveal that the fatigue limit is 76% higher in bending than in axial tension. A finite element model is used to compute the stress state in the threaded region for both axial tension and bending. It allows fitting a volume based weakest link model to the experimentally observed failure probabilities. Based on the good fit of the weakest link model it is argued that randomly distributed defects in the highly stressed thread root determine the fatigue strength. (C) 2014 Elsevier Ltd. All rights reserved.
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页码：102 / 108
页数：7
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