Optimum Forming Loading Paths for Pb-Sn Superplastic Sheet Materials

[+] Author and Article Information
Marwan K. Khraisheh

Department of Mechanical Engineering, King Fahd University of Petroleum and Minerals (KFUPM), Dhahran 31261, Saudi Arabia

Hussein M. Zbib

School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164-2920

J. Eng. Mater. Technol 121(3), 341-345 (Jul 01, 1999) (5 pages) doi:10.1115/1.2812384 History: Received December 29, 1997; Revised June 30, 1998; Online November 27, 2007


The bulge forming performance of Pb-Sn superplastic sheet materials is evaluated under different forming pressure-time profiles. In addition, an “optimum” pressure-time profile based on variable strain rates is proposed. Results of forming time, achieved amount of deformation, and thinning behavior are reported for the different forming pressure profiles. Not only the forming time was significantly reduced, when forming with the optimum pressure profile, but the integrity of the formed part was also maintained. Furthermore, the results show that forming profiles based on uniaxial models cannot successfully predict the actual forming behavior when the loading path is biaxial. In fact, the one-dimensional strain rate hardening relation, along with von Mises criterion, predict failure at a much higher strain (time) than the actual case.

Copyright © 1999 by The American Society of Mechanical Engineers
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