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Experimental characterization of the bending fatigue strength of threaded fasteners
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).
2015 (English)In: International Journal of Fatigue, ISSN 0142-1123, E-ISSN 1879-3452, Vol. 72, 102-108 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2015. Vol. 72, 102-108 p.
Keyword [en]
Fatigue, Bolt, Bending, Weakest link, Volume effect
National Category
Materials Engineering
URN: urn:nbn:se:kth:diva-160735DOI: 10.1016/j.ijfatigue.2014.11.005ISI: 000348260600011ScopusID: 2-s2.0-84913558239OAI: diva2:792096

QC 20150303

Available from: 2015-03-03 Created: 2015-02-27 Last updated: 2015-03-03Bibliographically approved

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