Application of over-and-under method in measurement of threshold of fatigue crack propagation in H2S environment

Song Yang; Yiliang Zhang; Jinquan Xu

doi:10.1117/12.839058

24 August 2009 Application of over-and-under method in measurement of threshold of fatigue crack propagation in H₂S environment

Song Yang, Yiliang Zhang, Jinquan Xu

Author Affiliations +

Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 73751E (2009) https://doi.org/10.1117/12.839058
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China

Abstract

The threshold in fatigue crack propagation (▵K_th), which is a principal indicator of the property resistant to fracture of members bearing crack defect during the process of corrosion fatigue, plays an important role in engineering project. ▵K_th cannot be directly obtained from test methods due to the accurate measurement of crack extension could not be conducted with the current test methods. The over-and-under method of fatigue reliability theory is innovatively introduced into the test determination of ▵K_th. Meanwhile, a flatbase for the determination of ▵K_th in low cycle fatigue H₂S environment is set up. Additionally, data analysis is conducted by the way corresponding to the over-and-under method. The results show that: 1) The test determination of ▵K_th can be effectively obtained through the test flatbase of corrosion fatigue. 2) The accurate measurement and study of ▵K_th in low cycle fatigue H₂S environment is realized by the over-and-under method of fatigue reliability theory. 3)The ▵K_th in air environment is obviously greater that the one in low cycle fatigue H₂S environment, where they differ by more than 50%.

Citation Download Citation

Song Yang, Yiliang Zhang, and Jinquan Xu "Application of over-and-under method in measurement of threshold of fatigue crack propagation in H₂S environment", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73751E (24 August 2009); https://doi.org/10.1117/12.839058

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