A Study of Strain and Strain-Rate Dependent Properties of a Superplastic Zn-Al Alloy Under Biaxial Stresses

[+] Author and Article Information
T. C. Hsu

University of Aston, Gosta Green, Birmingham, England

I. M. Bidhendi

Department of Mechanical Engineering, University of Aston, Gosta Green, Birmingham, England

J. Eng. Mater. Technol 104(1), 41-46 (Jan 01, 1982) (6 pages) doi:10.1115/1.3225034 History: Received July 21, 1981; Online September 15, 2009


A superplastic Zn-Al alloy in sheet form is formed into a bulge over a circular hole by pneumatic pressure. The geometry, the stress, the strain, and the strain-rate are determined at various points covering the whole specimen and at various stages of the forming process. The complicated shape, and its complicated changes, are represented by introducing an index for the local geometry, called “prolateness,” which is also related to the local stress ratio in a simple way. The biaxial stress is analyzed into a strain-proportional and a strain-rate-proportional component, which represent, respectively, the quasi-solid and the quasi-liquid behavior of the superplastic material.

Copyright © 1982 by ASME
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