Prediction capability of anisotropic yielding behaviour for DP590 steel at elevated temperatures

Abstract

ABSTRACT Trustworthy numerical simulations in sheet metal forming are highly dependent on accurate prediction of yielding response of a material. Thus, the present work is mainly focused on investigations of different anisotropic yielding criteria for DP590 steel at different temperatures. Firstly, tensile test has been performed at three temperatures, strain rates and orientations. The flow stress of metal increased with increase in strain rate and decrease in temperature. Various mechanical and anisotropic parameters are determined at different conditions. Further, different yield criteria, namely; Hill’48_r based, Hill’48_σ based and Barlat’89_r based have been formulated for the prediction of yielding response of a DP590 steel. The prediction capability has been evaluated based on yield loci, variation of normalised yield stress and anisotropy coefficient with the angle (θ). Also, global accuracy index developed by CERTETA research group has been used in order to evaluate the performance of different yield criteria. Based on the comparison, Barlat’89 yield criteria has been found to have the best yielding behaviour prediction capability for DP 590 steel at all testing temperatures followed by Hill’48_r based and Hill’48_σ based yield criteria.