The Interface Boundary Conditions for Bolted Flanged Connections

[+] Author and Article Information
J. C. Thompson, Y. Sze, D. G. Strevel

Civil Engineering Department, University of Waterloo, Canada

J. C. Jofriet

School of Engineering, University of Guelph, Canada

J. Pressure Vessel Technol 98(4), 277-282 (Nov 01, 1976) (6 pages) doi:10.1115/1.3454412 History: Received February 26, 1976; Online October 25, 2010


In most bolted connections, the unknown interface pressure distribution and the extent of the contact region are essential parameters in any stress analysis. Concerning these parameters, experimental and numerical studies of a model of an isolated single-bolt region show the following. The contact region between the flanges depends almost exclusively on the ratio of the flange thickness to the diameter of the surface region of each flange over which the bolt prestressing force is distributed; the contact zone is virtually independent of both the level of prestressing force and of the size of the bolt hole; and the contact stress distribution for a typical range of parameters is very closely approximated by a truncated conical distribution. The studies also delineate the regions of the flanges around each bolt where the stress state is strongly three-dimensional and regions where simple plate theory is applicable. The relationships established between the contact stress distribution and the various geometric parameters are presented in a form immediately applicable by designers.

Copyright © 1976 by ASME
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