In this study, special attention is paid to the definition of planar anisotropy of non-ferrous sheets at high temperatures. Barlats strain potential is employed for depicting the yield behavior. A smoothing function with a third order polynomial is introduced for non-isothermal Barlats anisotropy coefficients. The predicted Barlats coefficients are compared with experimentally obtained coefficients. As a crucial result, the smoothing function provides a big advantage in evaluating non-isothermal Barlats anisotropy coefficients: there is no necessity to carry out tensile tests in high temperatures.

Keywords: Anisotropy, Barlats Yield Function, Constitutive Equation, High Temperature, Non-isothermal Forming