Low cycle fatigue and cyclic stress ratcheting failure behavior of carbon steel 45 under uniaxial cyclic loading

In this paper, the cyclic strain low cycle fatigue and cyclic stress ratcheting failure of carbon steel 45 with quenched and tempered treatment were experimentally investigated. The tests for cyclic strain low cycle fatigue with or without mean strains were carried out to investigate the effect of mean strain on low cycle fatigue (LCF) behavior. The effects of mean stress and stress amplitude on the ratcheting failure were experimentally studied under stress controlled cycling tests also. The evolution equation of fatigue damage is proposed based on the symmetric cyclic strain LCF experimental results, and the equation is used to evaluate the effects of the fatigue damage on the ratcheting failure under different cyclic stressing.