Fatigue behavior of bolted boreholes under various preloads
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Robert Szlosarek
Robert Szlosarek, born in 1987, studied mechatronics from 2005 to 2010 at the University of Applied Sciences in Zittau, Germany. Afterward, he did his Ph.D. at the Graz University of Technology, Austria. Currently, he is working as a researcher at the Institute for Machine Elements, Engineering Design and Manufacturing at the Technical University Bergakademie Freiberg, Germany. His main field of interest is the stress and fatigue analysis of machine elements.
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Matthias Kröger
Matthias Kröger, born in 1968, studied mechanical engineering from 1988 to 1994 at the University of Hannover, Germany. At the same university, he finished his Ph.D. in 2001. From 1999 to 2008, he was the Engineer in Chief of the Institute of Mechanics at the University of Hannover, Germany. Since 2008, he is a full professor at the Technical University Bergakademie Freiberg, Germany. His fields of research are tribology, fatigue, and crashworthiness.
Abstract
Bolted joints are one of the most used joining technologies in engineering. It is possible to join different kind of materials and to transmit heavy loads. Nevertheless, they are vulnerable to fatigue cracks. The present research investigates the dependency between the preload of the bolt and the initiation of a fatigue crack in the bolted sheet. Therefore, a representative bolt connection with a bolt of size M22 was selected in combination with a 5 mm thick sheet made of steel S355MC (1.0976). The bolted sheet was loaded by a fluctuating tension load and a load ratio of 0.1. The test results show a strong correlation of the preload and the number of load cycles to crack for preloads from 0 kN to 30 kN. The load cycles to crack are increased by about factor 20 by using a preload in contrast to the sheet without any preload. For higher preloads, the load cycles to crack does not change considerably. However, the crack initiation location changes by increasing the preload. For small preloads, the crack starts at the bolt hole, and for high preloads, the crack starts at the fretting zone.
About the authors
Robert Szlosarek, born in 1987, studied mechatronics from 2005 to 2010 at the University of Applied Sciences in Zittau, Germany. Afterward, he did his Ph.D. at the Graz University of Technology, Austria. Currently, he is working as a researcher at the Institute for Machine Elements, Engineering Design and Manufacturing at the Technical University Bergakademie Freiberg, Germany. His main field of interest is the stress and fatigue analysis of machine elements.
Matthias Kröger, born in 1968, studied mechanical engineering from 1988 to 1994 at the University of Hannover, Germany. At the same university, he finished his Ph.D. in 2001. From 1999 to 2008, he was the Engineer in Chief of the Institute of Mechanics at the University of Hannover, Germany. Since 2008, he is a full professor at the Technical University Bergakademie Freiberg, Germany. His fields of research are tribology, fatigue, and crashworthiness.
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: None declared.
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Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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Articles in the same Issue
- Frontmatter
- Utilisation of the X-ray emission of an electron beam capillary for visualisation of the beam-material interaction
- Effect of Re and Ru additions on morphology and long-term stability of gamma prime particles in new modified superalloys prepared by a vacuum arc melting process
- Microstructure and fatigue performance of Cu-based M7C3-reinforced composites
- Influence of peroxide cross-linking temperature and time on mechanical, physical and thermal properties of polyethylene
- Fatigue behavior of bolted boreholes under various preloads
- Application of machine vision-based NDT technology in ceramic surface defect detection – a review
- An approach for obtaining surface residual stress based on indentation test and strain measurement
- Adhesive wear behavior of gas tungsten arc welded FeB-FeMo-C coatings
- Structural design optimization of the arc spring and dual-mass flywheel integrated with different optimization methods
- Tribological and adhesion properties of microwave-assisted borided AISI 316L steel
- Mechanical properties of wire arc additive manufactured carbon steel cylindrical component made by cold metal transferred arc welding process
- Improvement of the structural, thermal, and mechanical properties of polyurethane adhesives with nanoparticles and their application to Al/Al honeycomb sandwich panels
- Mechanical behavior of a friction welded AA6013/AA7075 beam
- Effects of carbon nanotubes on mechanical behavior of fiber reinforced composite under static loading
