Fatigue Crack Growth Thresholds at Negative Stress Ratio for Ferritic Steels in ASME Code Section XI | Zendy

Kunio Hasegawa | Zendy; Bohumír Strnadel | Zendy; Saburo USAMI | Zendy; Valéry Lacroix | Zendy

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Fatigue Crack Growth Thresholds at Negative Stress Ratio for Ferritic Steels in ASME Code Section XI

Author(s) -

Kunio Hasegawa,

Bohumír Strnadel,

Saburo USAMI,

Valéry Lacroix

Publication year - 2019

Publication title -

journal of pressure vessel technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.407

H-Index - 49

eISSN - 0094-9930

pISSN - 1528-8978

DOI - 10.1115/1.4043081

Subject(s) - paris' law , stress intensity factor , structural engineering , stress (linguistics) , materials science , crack closure , stress concentration , section (typography) , metallurgy , mechanics , fracture mechanics , engineering , physics , computer science , linguistics , philosophy , operating system

Thresholds of fatigue crack growth rates are important characteristics for fatigue crack growth assessment for the integrity of structural components. ASME Code Section XI provides fatigue crack growth thresholds for ferritic steels in air and water environments. The threshold is given as a constant value under a negative stress ratio. However, the thresholds are not clearly defined in the range of negative stress ratios. The definition seems to be maximum stress intensity factors. Besides, the thresholds expressed by the maximum stress intensity factors decrease with decreasing stress ratios. This means that the thresholds under negative stress ratios become unconservative assessments. The objective of this paper is to discuss the definition of fatigue crack growth threshold and to propose the threshold equation for the ASME Code Section XI, based on experimental data obtained from a literature survey.

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