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RESEARCH PAPERS: Reliability, Stress Analysis, and Failure Prevention Papers

Bolted Joints Under Tensile Service Loads: The Effect of Torsion in the Bolt on In-Service Clamping Loads

[+] Author and Article Information
J. Newnham

SPS Technologies Ltd., Leicester, England

L. Curley

SPS Laboratories, (A Subsidiary of SPS Technologies, Inc.), Naas, Ireland

J. Mech. Des 115(1), 36-40 (Mar 01, 1993) (5 pages) doi:10.1115/1.2919321 History: Received June 01, 1991; Online June 02, 2008

Abstract

In order to determine how bolted joints behave under conditions of tensile external loading, tests were conducted on bolts which had been tightened into joints by means of (a) elastic range, (b) yield, and (c) over-yielding tightening. The loading tests showed that the maximum clamp load which the bolt would exert on the joint without permanent extension was the uniaxial tensile yield load of the bolt. This was observed even when torsional stress was present in the as-tightened bolt, and for all three tightening methods.

Copyright © 1993 by The American Society of Mechanical Engineers
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