THE STUDY OF VISCOPLASTIC PROPERTIES UNDER COMPLEX LOADING

The goal of research was to conduct experimental study of viscoplastic properties under complex loading and the influence of simple and complex unloading. The following substantial results have been obtained: 1) the creeping under complex loading is lower than under simple loading; 2) the lowest creeping level is observed during tests under partial unloading in contrast with tests under complex unloading; 3) under complex unloading there is creeping observed, unlike simple loading where no creeping is found. The experimental data obtained will allow to formulate validated options of constitutive relations of plasticity theory.