Measurement on Fatigue Cracking Thresholds of the Cast Steel for Chinese Railway Rolling Wagon Bogie Frames
Measurement on fatigue cracking thresholds is investigated to the grade B cast steel for China railway rolling wagon bogie frames. Compact tensional specimens are fatigued under a continuous decreasing loading mode for present study. Results reveal that the minimum test values have different crack growth rates without meeting the code-based rate requirement. Therefore, the test results can not be directly used for measuring the thresholds. A probabilistic modeling in the form of a non-linear law is developed for reflecting the scattered test data. The thresholds at specified reliability levels are then derived in meeting the threshold definition with a specified growth rate. The measurement for the present material has verified the availability of the present modeling.
L.Y. Xie, M.N. James, Y.X. Zhao and W.X. Qian
H. B. Hu and Y. X. Zhao, "Measurement on Fatigue Cracking Thresholds of the Cast Steel for Chinese Railway Rolling Wagon Bogie Frames", Advanced Materials Research, Vols. 118-120, pp. 111-115, 2010