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TECHNICAL PAPERS

Bolt Thread and Head Fillet Stress Concentration Factors

[+] Author and Article Information
Terry F. Lehnhoff

Department of Mechanical and Aerospace Engineering and Engineering Mechanics, 106C Mechanical Engineering Building, 1870 Miner Circle, University of Missouri, Rolla, Rolla, MO 65409-0050e-mail: lehnhoff@umr.edu

Bradley A. Bunyard

Applications Engineering, Ferguson Company, St. Louis, MOe-mail: bbunyard@ferguson-co.com

J. Pressure Vessel Technol 122(2), 180-185 (Mar 07, 2000) (6 pages) doi:10.1115/1.556168 History: Received August 11, 1999; Revised March 07, 2000
Copyright © 2000 by ASME
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References

Oberg, E., Jones, F. D., Holbrook, H. L., and Ryffel, H. H., 1996, Machinery’s Handbook, Industrial Press, 25th Edition.
Avallone, A. A., and Baumeister, III, T., 1996, Marks’ Standard Handbook for Mechanical Engineers, McGraw-Hill, 10th Edition.
Lehnhoff, T. F., and Bunyard, B. A., 1998, “Effects of Bolt Threads on the Stiffness of Bolted Joints,” ASME, Anaheim, CA, Recent Advances in Solids and Structures, PVP-Vol. 381, pp. 141–146.
Lehnhoff, T. F., and Wistehuff, W. E., 1994, “Nonlinear Effects on the Stiffness of Bolted Joints,” ASME Pressure Vessels and Piping Conference, Minneapolis, MN.
Lehnhoff,  T. F., and Wistehuff,  W. E., 1996, “Nonlinear Effects on the Stiffness of Bolted Joints,” ASME J. Pressure Vessel Technol., 118, pp. 48–53.
Shigley, J. E., and Mischke, C. R., 1989, Mechanical Engineering Design, McGraw-Hill, 5th Edition.
Norton, R. L., 1996, Machine Design an Integrated Approach, Prentice-Hall.
Pilkey, Walter D., 1997, Peterson’s Stress Concentration Factors, Wiley, 2nd Edition.

Figures

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Thread dimensions for deep thread models
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Thread dimensions for shallow thread models
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Schematic of axisymmetric model
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Stress concentration factor by thread (8-mm bolt shallow threads)
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Stress concentration factor by thread (8-mm bolt deep threads)
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Stress concentration factor by thread (12-mm bolt shallow threads)
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Stress concentration factor by thread (12-mm bolt deep threads)
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Stress concentration factor by thread (16-mm bolt shallow threads)
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Stress concentration factor by thread (16-mm bolt deep threads)
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Stress concentration factor by thread (20-mm bolt shallow threads)
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Stress concentration factor by thread (20-mm bolt deep threads)
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Stress concentration factor by thread (24-mm bolt shallow threads)
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Stress concentration factor by thread (24-mm bolt deep threads)
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Stress concentration factor for bolt head fillet (all bolt diameters)
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Example of stress contour plot at head fillet
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Example of stress contour plot at first engaged thread

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