Effect of Solution Methods for Evolutionary R-Values on the Prediction of Anisotropic Yield Behavior

The article investigates the impact of various solution methods for evolutionary R-values on the prediction of anisotropic yield behavior in metal sheets. It compares the Hill48, Hill48-non, and Yld2000-3d yield models, evaluating their accuracy in predicting uniaxial tensile stress and yield loci. The study also examines the influence of these methods on deep drawing simulations, highlighting the significance of choosing the right method for accurate predictions. The research focuses on DP590 metal sheets, using uniaxial tensile tests and biaxial tensile tests to calibrate the models. The results show that the inverse exponential function method provides the highest accuracy, while the slope method has significant limitations. The study concludes that considering the evolution of R-values and selecting the appropriate solution method is crucial for improving the accuracy of anisotropic yield models.