Experimental study of the influence of strain-stress state on the jerky flow in metals and alloys

Abstract This work is concerned with improvement of experimental methods for studying the influence of the stress-strain state on the spatial time inhomogeneity die to the jerkyflow of Al-Mg alloys and carbon steels. The implementation of a complex stress state is based on the use of specimens with special complicated geometry. Mechanical tests were carried out on uniaxial tension of plates with a rigid rim, in the working part of which biaxial tension and combined tension-compression loading is realized. Evolution of inhomogeneous strain and temperature fields were analyzed by using the digital image correlationtechnique and infrared thermography. Experimental data on the kinetics of initiation and development of the deformation bandsdue to the Chernov-Luders behavior and Portevin-Le Chatelier effectin various types of stress-strain state of the material were obtained.