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YANG Bing, ZHAO Yong-xiang, ZHANG Wei-hua. Probabilistic Models of Random Fatigue Crack Propagation Based on Forman Equation[J]. Journal of Traffic and Transportation Engineering, 2006, 6(1): 25-28.
Citation: YANG Bing, ZHAO Yong-xiang, ZHANG Wei-hua. Probabilistic Models of Random Fatigue Crack Propagation Based on Forman Equation[J]. Journal of Traffic and Transportation Engineering, 2006, 6(1): 25-28.
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Probabilistic Models of Random Fatigue Crack Propagation Based on Forman Equation

  • State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

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  • Author Bio:

    YANG Bing (1979-), male, doctoral student, 86-28-87600935, yb@home.swjtu.edu.cn

  • Received Date: 2005-09-10
  • Publish Date: 2006-03-25
    Abstract
  • In order to improve the prediction precision of random fatigue crack propagation, its probabilistic models based on Forman equation and the estimation method of its parameters were developed, the effect of test data scattering regularity and sampling size on probabilistic assessment was taken into account, the models consisted of survival probability-based curves, confidence-based curves and survival-probability-and-confidence-based curves, their parameters of were measured by linear regression technique and maximum likelihood method.The prediction data of LZ50 axle steel indicate that the models show the effect of material rupture temper on long crack propagation, over come the non-conservative prediction of conventional models based on Paris-Erdogan equation in high intensity factor range, which shows that the models are reasonable and feasible.

     

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