Influence of additional vibration impact on kinetics of strain bands due to the Chernov-Lüders deformation and Portevin-Le Chatelier effect in metals

Abstract

The aim of the work is to investigate the influence of additional vibration impact on spatial-time inhomogeneity of plastic flow due to the Chernov-Lüders deformation and Portevin-Le Chatelier effect in metals (carbon steel and Al-Mg alloy) during uniaxial tension tests. Experimental data were obtained (diagrams, evolution of strain fields and local deformation rates, temperature fields, AE parameters) characterizing the kinetics of the strain bands initiation and propagation. The evolution of inhomogeneous strain and temperature fields were analyzed by using the digital image correlation technique and the infrared thermography accordingly. The mechanical behavior and the regularities of the jerky flow were studied using analysis of stress serrations and the accompanying acoustic emission.