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RESEARCH PAPERS

Deformation and Curvatures in Sheet-Metal in the Bulge Test

[+] Author and Article Information
H. M. Shang

Department of Mechanical and Production Engineering, University of Singapore, Republic of Singapore

T. C. Hsü

Department of Mechanical Engineering, University of Aston, Birmingham, Great Britain

J. Eng. Ind 101(3), 341-347 (Aug 01, 1979) (7 pages) doi:10.1115/1.3439516 History: Received August 14, 1978; Online July 15, 2010

Abstract

The displacements and strains of a circular specimen subjected to hydraulic pressure are studied and are compared with theoretical results predicted by previous investigators. By proposing a concept called prolateness, which gives an indication of the deviation of a local surface from a perfect sphere, it is found that the shape of the deformed bulge is not as simple as it has often been thought to be—the prolateness of a bulge is never constant at any deformation stage. Results also show that, between the beginning and the end of the forming process, there are the initial, stable and unstable regimes of deformation.

Copyright © 1979 by ASME
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