On the Theories of Sheet Metal Necking and Forming Limits

[+] Author and Article Information
A. S. Korhonen

Helsinki University of Technology, Department of Mining and Metallurgy, Laboratory of Metal Working and Heat Treatment, Espoo, Finland

J. Eng. Mater. Technol 100(3), 303-309 (Jul 01, 1978) (7 pages) doi:10.1115/1.3443494 History: Received August 16, 1977; Revised April 04, 1978; Online August 17, 2010


The history and the present state of the theory of sheet metal forming limits are reviewed. The theory of necking and plastic instability (Swift-Hill and Marciniak-Kuczyński models) is discussed and theoretical limit strains are calculated. The influence of the strain path on the theoretical limit strains is discussed with computational examples. At the present no theory can fully explain the localized necking in stretch forming.

Copyright © 1978 by ASME
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