Methodology for determining the region of stabilization of low-cycle fatigue

Abstract

In present paper, the behaviour of high-strength low-alloyed (HSLA) steel under conditions of low-cycle fatigue (LCF) has been experimentally tested and analyzed. Based on the experimental results obtained in the programme EXCEL, characteristic regions of low-cycle fatigue of steel NIONIKRAL 70 (NN-70) have been determined, the most important being the region of stable behaviour of materials, so-called "the region of stabilization". From this region, on the basis of pre-defined requirements, characteristic stabilized hysteresis have been isolated for each strain level, based on which the Indicators of low-cycle fatigue of steel NN-70 have been identified.