Probabilistic Crack Propagation Behavior of Railway B Grade Steel
Fatigue crack growth rate (FCGR) test of B grade steel was performed to clarify the probabilistic behavior of crack propagation in near-threshold region and steady-state region. As a result, a crack propagation law considering influence of threshold value and average stress can be well proposed to estimate crack propagation behavior of B grade steel. The estimated value of threshold value ΔKth is 293.65MPamm1/2, approaching the experimental value of ΔKth, about 280.39MPamm1/2. Furthermore, the probabilistic FCGR curves of B grade steel are established from the viewpoint of survival probability and confidence degree, which reflects the influence of scatter regularity of data and sample size on reliability assessment.
Zhengyi Jiang and Chunliang Zhang
W. Li et al., "Probabilistic Crack Propagation Behavior of Railway B Grade Steel", Advanced Materials Research, Vols. 97-101, pp. 484-487, 2010