Numerical analysis of non-isothermal warm deep drawing of an Al-Mg alloy using different yield criteria and experimental validation

Abstract

Finite element analysis of non-isothermal warm deep drawing of AA5083-O aluminum alloy sheets has been carried out using a coupled thermomechanical numerical model. Two different yield criteria, namely Hill's and Barlat's criteria have been used to define the yielding behavior in the simulations. Using cold punch in combination with hot dies significantly improved the drawability of the sheet material but at the same time resulted in a large thermal gradient and strain rate variation during the process. Therefore, for a better predictive accuracy, the effect of strain rate and temperature has been incorporated into the simulations by defining the stress–strain curves at various temperatures and strain rates. Numerical simulations have also been carried out at different initial blank temperatures and punch speeds to study the influence of temperature and speed on drawability, thinning, and drawing load. The predicted drawability, thinning, and drawing load are found to be in good agreement with the experiments.