Stress-based fatigue life prediction models for AZ31B magnesium alloy under single-step and multi-step asymmetric stress-controlled cyclic loadings

► Uniaxial ratcheting and low-cycle fatigue failure behaviors of AZ31B magnesium alloy. ► Effects of variable loading histories on ratcheting and low-cycle fatigue life. ► The asymmetric stress-controlled single-step and multi-step cyclic loadings. ► Stress-based fatigue life evaluation models were developed.