Abstract
Owing to the remarkable advantages in mechanical behavior, cast steel nodes have been widely used in static structures. Nowadays, cast steel nodes also gain increasing popularity due to the superior fatigue performance in dynamic structures, but they are not yet widely used because the fatigue properties of cast steel are not well understood. In this paper, the fatigue test of cast steel GS20Mn5V commonly used in steel castings is carried out. The strength of medium and low cycle fatigue and the fatigue limit are obtained. The feasibility of the estimated S-N (fatigue stress versus life) curve is tested. The double logarithmic linear model (DLLM) and the reversed generalized Pareto model (RGPM) are used to fit the experimental data, and the comparison is made. The P-S-N (the relationship between fatigue stress and life at different survival rate) curve obtained by the RGPM is proposed. The results show that the estimated S-N curve is not suitable for low cycle fatigue life, fitting the experimental data with the RGPM is the best, and obtaining the P-S-N curve from the RGPM is feasible.
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