Prediction of Plastic Wrinkling Using the Energy Method

Author:

Cao J.1

Affiliation:

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

Abstract

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.

Publisher

ASME International

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics

Reference23 articles.

1. Bakkenstuen, R. S., 1994, “Closed Loop Control of Forming Stability During Aluminum Stamping,” M.S. thesis, MIT, Cambridge, MA.

2. Cao J. , and BoyceM., 1997, “Wrinkling Behavior of Rectangular Plates Under Lateral Constraint,” International Journal of Solids & Structure, Vol. 34, No. 2, pp. 153–176.

3. Cao, J., Karafillis, A., and Ostrowski, M., 1997, “Prediction of Flange Wrinkles in Deep Drawing,” Advanced Methods in Material Processing Defects, M. Predeleanu and P. Gilormini, eds., pp. 301–310.

4. Cao, J., and Wang, X., 1998, “An Analytical Model for Plate Wrinkling Under Tri-axial Loading and its Application,” International Journal of Mechanical Science, to appear.

5. Hill R. , 1958, “A Theory of the Yielding and Plastic Flow of Anisotropic Metals,” Proc. R. Soc. Lond., Vol. A193, p. 281281.

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