The mechanical behavior of fatigue damaged material is expected to differ from that of damage free ones. In this study, three different load histories were applied on round specimens made of AISI 1022 HR and CSA G40.21 350WT steels. Axial loading was applied using a strain controlled mode to determine the effect of cyclic strain on the linear-nonlinear behavior of steels. The experimental results show a significant effect of strain cycles on the linear-nonlinear behavior of steels used in this study. The hysteresis indicates stress relaxation for all loading histories. However, rates of stress relaxation were different depending on the applied mean strain value. Furthermore, specimens tested at low temperatures exhibited different linear-nonlinear behavior than those tested at room temperature.
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