Distinctive mechanical behavior of bolted joints is caused by the helical shape of thread geometry. Recently, a number of papers have been published to elucidate the strength or loosening phenomena of bolted joints using three-dimensional finite element analysis. In most cases, mesh generations of the bolted joints are implemented with the help of commercial software. The mesh patterns so obtained are, therefore, not necessarily adequate for analyzing the stress concentration and contact pressure distributions, which are the primary concerns when designing bolted joints. In this paper, an effective mesh generation scheme is proposed, which can provide helical thread models with accurate geometry to analyze specific characteristics of stress concentrations and contact pressure distributions caused by the helical thread geometry. Using the finite element (FE) models with accurate thread geometry, it is shown how the thread root stress and contact pressure vary along the helix and at the nut loaded surface in the circumferential direction and why the second peak appears in the distribution of Mises stress at thread root. The maximum stress occurs at the bolt thread root located half a pitch from nut loaded surface, and the axial load along engaged threads shows a different distribution pattern from those obtained by axisymmetric FE analysis and elastic theory. It is found that the second peak of Mises stress around the top face of nut is due to the distinctive distribution pattern of .
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e-mail: fukuoka@maritime.kobe-u.ac.jp
e-mail: nomura@maritime.kobe-u.ac.jp
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February 2008
Research Papers
Proposition of Helical Thread Modeling With Accurate Geometry and Finite Element Analysis
Toshimichi Fukuoka,
Toshimichi Fukuoka
Professor
Faculty of Maritime Sciences,
e-mail: fukuoka@maritime.kobe-u.ac.jp
Kobe University
, 5-1-1 Fukaeminami, Higashinada, Kobe 658-0022, Japan
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Masataka Nomura
Masataka Nomura
Associate Professor
Faculty of Maritime Sciences,
e-mail: nomura@maritime.kobe-u.ac.jp
Kobe University
, 5-1-1 Fukaeminami, Higashinada, Kobe 658-0022, Japan
Search for other works by this author on:
Toshimichi Fukuoka
Professor
Faculty of Maritime Sciences,
Kobe University
, 5-1-1 Fukaeminami, Higashinada, Kobe 658-0022, Japane-mail: fukuoka@maritime.kobe-u.ac.jp
Masataka Nomura
Associate Professor
Faculty of Maritime Sciences,
Kobe University
, 5-1-1 Fukaeminami, Higashinada, Kobe 658-0022, Japane-mail: nomura@maritime.kobe-u.ac.jp
J. Pressure Vessel Technol. Feb 2008, 130(1): 011204 (6 pages)
Published Online: January 17, 2008
Article history
Received:
September 1, 2006
Revised:
December 8, 2006
Published:
January 17, 2008
Citation
Fukuoka, T., and Nomura, M. (January 17, 2008). "Proposition of Helical Thread Modeling With Accurate Geometry and Finite Element Analysis." ASME. J. Pressure Vessel Technol. February 2008; 130(1): 011204. https://doi.org/10.1115/1.2826433
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