Probabilistic Crack Propagation Behavior of Railway B Grade Steel

Wei Li; Qiang Li; Ping Wang

doi:10.4028/www.scientific.net/AMR.97-101.484

Paper Titles

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Effects of Mg-Doping on Structure and Electric Properties of Mg_xZn_1-xO:Al Ceramics
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Frequency Equations of Magneto-Thermoviscoelastic Surface Wave
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Probabilistic Crack Propagation Behavior of Railway B Grade Steel
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Microstructure and Mechanical Properties of Cast Ti25Nb3Mo3Zr2Sn Alloy
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Creep Behavior of an AZ91 Magnesium Alloy Reinforced with Aluminum Silicate Short Fibers
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The Effect of Precipitates on Anisotropy of Al-Li Alloys 2090 and 2090+Ce
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The Characteristics of the Magnetic Memory Signals under Different States for Q235 Defect Samples
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Probabilistic Crack Propagation Behavior of Railway B Grade Steel

Abstract:

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.