A Time-Dependent Material Model for the Simulation of Hot Gas-Pressure Forming of Magnesium Alloy AZ31

Abstract:

A time-dependent material constitutive model is developed for the deformation of wrought Mg AZ31 sheet material at 450°C. This material model is used to simulate gas-pressure bulge forming of AZ31 sheet into hemispherical domes. Finite-element-method (FEM) simulations using this material model are compared against experimental data obtained for dome height as a function of forming time under forming conditions identical to those assumed in the simulations. The time-dependent material model predicts experimental dome heights during forming with a quite useful accuracy. The most significant advantage of the time-dependent material model is that it can address the effect of preheating time on forming. Preheating times shorter than ~120 s produce an increase in forming rate. This material model provides a quantitative means of accounting for that effect.

• Periodical: Materials Science Forum (Volume 735)
• Pages: 198-203
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.735.198
• Online since: December 2012
• Authors: Alexander J. Carpenter, Eric M. Taleff, Louis G. Hector, Jon T. Carter, Paul E. Krajewski
• Keywords: AZ31, Magnesium, Modeling, Simulation, Superplasticity

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