Plastic Deformation of Anisotropic Tubes in Hydraulic Bulging

[+] Author and Article Information
D. M. Woo

Department of Mechanical Engineering, University of Sheffield, Sheffield, England

A. C. Lua

Monsanto Electronic Co., Malaysia

J. Eng. Mater. Technol 100(4), 421-425 (Oct 01, 1978) (5 pages) doi:10.1115/1.3443514 History: Received February 08, 1978; Online August 17, 2010


The anisotropy of tubular material is assessed from the values of the width/thickness strain ratio determined in the tension tests. Applying Hill’s theory of plastic anisotropy, these values are incorporated in the expressions for determining the stress/strain characteristics for anisotropic material in the tension and bulge tests, and also in the theoretical analysis of the hydraulic bulging of anisotropic tubes. Experiments have been carried out on copper tubes. Taking into account the anisotropy effect, the stress/strain curves determined in the tension and bulge tests agree closely except at the low strain region. In the analysis of the bulging process, comparison is made between the theoretical and the experimental circumferential strain distribution. The results appear satisfactory.

Copyright © 1978 by ASME
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