A NEW METHOD FOR CALCULATING THE PEAK TEMPERATURE EVOLUTION IN THE ADIABATIC SHEAR BAND OF STEEL

A new method for predicting the peak temperature evolution in the adiabatic shear band (ASB) of steel is proposed to overcome the drawback of the traditional method's underestimation of the peak temperature in the ASB. The average shear strain of a thin-walled tube in torsion is divided into three parts: the elastic shear strain, the average plastic shear strain outside the ASB, and the average plastic shear strain of the ASB. The relation between the shear stress acting on the tube and the average shear strain of the tube is established. The postpeak shear stress-average shear strain curve of the ASB is found to be dependent on the gage length. As an example, the shear stress-average plastic shear strain curve of the ASB is back-calculated from the measured shear stress-average shear strain curve of an AISI 1018 cold rolled steel tube. The peak temperature and average temperature in the ASB are calculated and compared with the experimental result. It is found that the calculated peak temperature is closer to or slightly higher than the experimental result. The latter is a satisfactory result due to the underestimated peak temperature in the ASB in experiments.