Many studies have been devoted to investigate how the maximum stress occurred in the bolted joint could be reduced. Patterson and Kenny suggest that a modified nut with a straight bevel at the bearing surface is effective. However, they only dealt with M30, and estimations on the nut geometry had not been necessarily sufficient. In this study, an extensive finite element approach for solving general multi-body contact problem is proposed by incorporating a “regularization method” into stiffness matrices with singularity involved; thus, numerical analyses are executed to accurately determine the optimal shape of the modified nut for various design factors. A modified nut with a curved bevel is also treated, and it is concluded that the modified nuts are significantly effective for bolts with larger nominal diameter and fine pitch, and are practically useful compared to pitch modification and tapered thread methods.
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February 1997
Research Papers
Evaluation of the Method for Lowering Stress Concentration at the Thread Root of Bolted Joints With Modifications of Nut Shape
T. Fukuoka
T. Fukuoka
Department of Marine Engineering, Kobe University of Mercantile Marine, 5-1-1, Fukaeminami, Higashinadaku, Kobe, 658 Japan
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T. Fukuoka
Department of Marine Engineering, Kobe University of Mercantile Marine, 5-1-1, Fukaeminami, Higashinadaku, Kobe, 658 Japan
J. Pressure Vessel Technol. Feb 1997, 119(1): 1-9 (9 pages)
Published Online: February 1, 1997
Article history
Received:
August 8, 1995
Revised:
April 3, 1996
Online:
February 11, 2008
Citation
Fukuoka, T. (February 1, 1997). "Evaluation of the Method for Lowering Stress Concentration at the Thread Root of Bolted Joints With Modifications of Nut Shape." ASME. J. Pressure Vessel Technol. February 1997; 119(1): 1–9. https://doi.org/10.1115/1.2842262
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