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.
Highlights
The 34CrMo4 steel grade is a low-carbon steel with medium through-hardening for mediumduty machine parts
3.2 The Results Obtained by Digital image correlation (DIC) The principle of the method is based on scanning of stochastic black and white spotted pattern created on the surface of the examined object, for example, by spraying black paint on white background
The stress analysis of tensile tested specimens made from 34CrMo4 steel was performed using digital image correlation
Summary
The 34CrMo4 steel grade is a low-carbon steel with medium through-hardening for mediumduty machine parts. The use of the 34CrMo4 steel grade lies primarily in the production of blanks – forgings, seamless tubes, steel for refining and in cold drawn steel for refining. It is used in hot-rolled billets, rolled bars, wire and universal mill plates, steel plates and hot-rolled strips, for free and drope stampings. Increasing content of molybdenum in the Cr-Mo steel type, increases the throughhardening, but it prevents significant drop in hardness during tempering. Molybdenum further increases the steel resistance against tempering brittleness. Digital image correlation (DIC) is one of the non-interferometric contactless methods for determining the deformations on the surface of objects.
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