STRESS ANALYSIS IN CYLINDRICAL SPECIMENS MADE FROM 34CrMo4 USING DIC

Abstract

The stress analysis using digital image correlation was carried out on cylindrical tensile specimens made from low carbon 34CrMo4 steel. The results obtained by conventional tensile test were compared with the results obtained by digital image correlation. The true stresses were evaluated from the compiled true stress-strain diagrams and compared with the engineering stresses. The average values of the yield stress and tensile strength reached of 945±15 MPa and 1039±5 MPa, respectively. Thus, parameters obtained from tensile test were plotted in the engineering diagrams that represent often starting diagrams for engineering practice. Based on results of digital image correlation the possibility of construction of the true stress-strain diagrams is discussed with regard to more exact values of stress for use in practice. The evaluation and compilation of the true stress-strain diagrams were carried out by means of image correlation software Vic 2D.