Prediction of Plastic Wrinkling Using the Energy Method

[+] Author and Article Information
J. Cao

Department of Mechanical Engineering, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208-3111

J. Appl. Mech 66(3), 646-652 (Sep 01, 1999) (7 pages) doi:10.1115/1.2791505 History: Received November 11, 1998; Revised February 11, 1999; Online October 25, 2007


The prediction and prevention of wrinkling during a sheet metal forming process have been challenging issues on the design of part shape, die geometry, and processing parameters. In an effort to provide a reliable and efficient tool to assess the onset of wrinkling, analytical models for flange wrinkling and straight side-wall wrinkling are presented here. Using a combination of energy conservation and plastic bending theory, the critical buckling wavelength and stress are calculated as functions of the boundary conditions (displacement constraint and binder pressure). Comparisons between the numerical and experimental results are given for both cases and excellent agreement is obtained.

Copyright © 1999 by The American Society of Mechanical Engineers
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