LI Wei, LU Lian-tao. Probabilistic character for S-N relations of high carbon-chromium bearing steel in super-long cycle life region[J]. Journal of Traffic and Transportation Engineering, 2006, 6(2): 17-21.
Citation: LI Wei, LU Lian-tao. Probabilistic character for S-N relations of high carbon-chromium bearing steel in super-long cycle life region[J]. Journal of Traffic and Transportation Engineering, 2006, 6(2): 17-21.

Probabilistic character for S-N relations of high carbon-chromium bearing steel in super-long cycle life region

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  • Author Bio:

    Li Wei(1979-), male, graduate student, 86-28-87600935, lw_cy@sina.com

    Lu Lian-tao(1965-), male, associate professor, 86-28-87634355, luliantao@hotmail.com

  • Received Date: 2005-09-10
  • Publish Date: 2006-06-25
  • In order to accurately evaluate the fatigue S-N (stress-life) test data of high carbon-chromium bearing steel in super-long cycle life region, the entire S-N data and the S-N data based on differentiating fatigue crack initiation mechanisms were fitted by general maximum likelihood method respectively, its probabilistic S-N curve models were established. Analysis result shows that the test data can be well fitted and the S-N curve can be well depicted with differentiating fatigue crack initiation mechanisms. It is discovered that when load level is above the fatigue limit (about 1200 MPa), the S-N curve that fatigue crack initiates from surface should be chosen, on the contrary, the S-N curve that fatigue crack initiates from subsurface should be chosen. It is proved that the material's probabilistic S-N curves, including survival probability-stress-life curves, confidence stress-life curves and survival probability-confidence-stress-life curves, can be determined, and the probabilistic characters for the S-N relations in super-long cycle life region can be depicted by general maximum likelihood method.

     

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