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Structural Research Series 191PDF


Title:Studies of the Effect of Washers on the Clamping Force in High-Strength Bolts
Author(s):Lewitt, C.W.; Chesson, Jr., E.; Munse, W.H.
Subject(s):Bolts and nuts -- Testing
Washers (Fasteners)
Clamping force
Abstract:Forty-six tests of individual bolts were made to evaluate the effect I of washers on the clamping force developed in high-strength bolt assemblies. Also, nine fatigue specimens, all four-bolt double-lap jOints, were inclded in the program to determine whether there would be any change in the fatigue life of the joints if the washers were omitted. All bolts used in these tests were 3/4-in." diameter, except for those in one of the fatigue specimens, which had l-in'' bolts. The bolts were tightened by a turn-of-the-nut method. Several nut and head sizes were employed. The bolt tests have indicated that there is no great or significant difference in the clamping force that is developed either with or without washers. The joint tests suggest that the fatigue lives of specimens without washers are generally as great as those for specimens with washers.
Issue Date:1960-03
Publisher:University of Illinois Engineering Experiment Station. College of Engineering. University of Illinois at Urbana-Champaign.
Series/Report:Civil Engineering Studies SRS-191
Genre:Technical Report
Sponsor:Research Council on Riveted and Bolted Structural Joints
The Division of Highways. State of Illinois.
The U.S. Department of Commerce. Bureau of Public Roads.
American Institute of Steel Construction
Industrial Fasteners Institute
Date Available in IDEALS:2009-09-21

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