Reliability Estimation of Fatigue Life for Machine Parts under Uniaxial Constant Amplitude Load

Abstract:

Two methods acquiring p-S-N curve for machine parts are given, namely directly searching out the p-S-N curve of the material from material database and using the idealized p-S-N curve. Reliability estimation methods of fatigue life of machine parts are derived under uniaxial constant amplitude load. Two kinds of circumstances (fixed stress and probabilistic stress) and two kinds of stress cycles (reversed cycle and unsymmetric reversed cycle) are considered. An iteration method is presented and the corresponding computer program is developed for estimating reliable life of machine parts. The engineering application results show that the calculated results are closer to experimental results. The suggested method can be convenient to fatigue reliability design of machine parts. It has good stimulative effect on popularization and application of existing anti-fatigue design method for machine parts, and high value of engineering application.

• Periodical: Applied Mechanics and Materials (Volumes 249-250)
• Pages: 632-635
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.249-250.632
• Online since: December 2012
• Authors: Yu He Li, Xin Li Bai, Ying Fang Zhang
• Keywords: Fatigue Life, P-S-N Curve, Reliability Estimation, Reversed Cycle, Uniaxial Stress

References

[1] S.B. Zhao, Z.B. Wang, Anti-fatigue design - methods and data, Mechanical Industry Press, Beijing, (1997).

[2] S.B. Zhao, Z.B. Wang, Mechanical Structure Strength Assessment Method, ZRIME Press, Zhengzhou, (2011).

[3] S.B. Zhao, Research on Cumulative Fatigue Damage Law, ZRIME Press, Zhengzhou, (2009).