Distortion of U-Channel Sections in Plastic Bending

[+] Author and Article Information
K. A. Stelson

Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455

A. Kramer

Department of Mechanical Engineering, Technical University of Braunschweig, Braunschweig, Germany

J. Manuf. Sci. Eng 121(2), 208-213 (May 01, 1999) (6 pages) doi:10.1115/1.2831207 History: Received July 01, 1997; Revised January 01, 1998; Online January 17, 2008


When a thin-walled U-channel section is plastically bent, considerable in-plane distortion occurs. The initially flat base of the U is deformed into a circular arc. The sides remain perpendicular to the base so that an angle between the sides develops. In this paper, an analytical expression for the amount of distortion is derived based on energy minimization. The expression is purely geometrical indicating that distortion should not depend on material properties. The theory is compared with fourpoint bending experiments of thin-walled channels, with good agreement found.

Copyright © 1999 by The American Society of Mechanical Engineers
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