Application of the Method for Optical Measuring the Neck Profile to Determine the Hardening Curve of Aluminum from the Results of the Tensile Test

The article is devoted to studying the rheological properties of metals and alloys in a cold state based on the results of tensile tests of cylindrical specimens. The aim of this study is to apply the method for optical measuring the neck profile for determining the hardening curve and to evaluate the accuracy of the data obtained using reverse simulation of the test process. For the study, the specimen of aluminum was used, which is characterized by increased plasticity and a continuous stage of deformation concentrated in the neck. The experimental data were processed using the Bridgman, Davidenkov-Spiridonova, and Ostsemin models. The results of the reverse simulation that performed using the hardening curve based on the Ostsemin model have the greatest convergence with the laboratory experiment in terms of tensile force and convergence at the level of other models in terms of neck shape change.