Johnson-Cook based criterion incorporating stress triaxiality and deviatoric effect for predicting elevated temperature ductility of titanium alloy sheets

In this paper, a new model based on the Johnson-Cook fracture criterion is proposed to predict the ductility of Ti6Al4V titanium alloy sheets deformed at wide range of temperatures (25–900 °C) and stress states. Experiments were carried out and strain at fracture recorded on samples of different shapes to cover various loading conditions: uniaxial tensile, shear and equi-biaxial plane stress tension. The stress triaxiality and the deviatoric...