Experimental characterization of the bending fatigue strength of threaded fasteners
Source abstract
Abstract
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.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Engineering Structural Analysis Methods · Mechanical Failure Analysis and Simulation · Mechanical stress and fatigue analysis
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References (15)
Show source-provided references
1. ISO 3800:1993. Threaded fasteners – axial load fatigue testing – test methods and evaluation of results.
2. VDI-2230 Systematic calculation of high duty bolted joints – joints with one cylindrical bolt. Verein Deutscher Ingenieure; 2003.
3. Handbok om skruvförband 2nd ed., Kista: Colly Company AB; 1995.
4. The effect of eccentric loading on the fatigue performance of high-tensile bolts10.1016/S0142-1123(00)00004-9 ↗
5. 2010
6. The effect of loaded volume and stress gradient on the fatigue limit10.1016/j.ijfatigue.2006.11.011 ↗
7. Sadek S, Sandberg D, Olsson M. FE-mesh effect of the volume based weakest-link fatigue probability applied to a compressor blade. In: Proceedings of the ASME Turbo Expo. vol. 7, Issue PARTS A AND B; 2012. p. 427–38.10.1115/GT2012-69852 ↗
8. New models for prediction of high cycle fatigue failure based on highly loaded regions10.1016/j.ijfatigue.2014.03.014 ↗
9. Experimental evaluation of fatigue life and fatigue crack growth in a tension bolt-nut threaded connection10.1016/j.ijfatigue.2010.08.003 ↗
10. Three-dimensional finite element analysis of tightening and loosening mechanism of threaded fastener10.1016/j.engfailanal.2004.09.009 ↗
11. 2001
12. A statistical theory of the strength of materials
13. ISO 724:1993. ISO general-purpose metric screw threads – basic dimensions.
14. ISO 965–1:2013. ISO general purpose metric screw threads – tolerances – Part 1: principles and basic data.
15. ISO 965–2:1998. ISO general purpose metric screw threads – tolerances – Part 2: limits of sizes for general purpose external and internal screw threads – medium quality.