Effects of Prestrain With Strain Gradient Present on Sheet Metal Formability

[+] Author and Article Information
H. M. Shang, G. S. Tan, W. C. M. Tan

Department of Mechanical and Production Engineering, National University of Singapore, Kent Ridge, Singapore 0511

J. Eng. Mater. Technol 107(4), 298-306 (Oct 01, 1985) (9 pages) doi:10.1115/1.3225823 History: Received August 13, 1984; Online September 15, 2009


In this investigation, two double-stage forming processes are used to study the effects of prestrain on sheet metal formability. The processes chosen are the bulge test and the plunger test using a die throat to punch diameter ratio of 2.42. It is seen that during the second stage of forming, deformation and shape of the deformed shell are influenced by the level of prestrain and strain gradients on the prestrained workpiece. An improved formability is observed when the workpiece for the plunger test is prestrained by hydroforming, but the formability is reduced when the prestraining process becomes the plunger test. The present results also imply that care should be taken in utilizing the forming limit diagram even if it is constructed from double-stage forming, in which strain gradient on the prestrained workpiece is generally absent.

Copyright © 1985 by ASME
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