Research Papers: Codes and Standards

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

[+] Author and Article Information
Kunio Hasegawa, Bohumir Strnadel

Center of Advanced Innovation Technologies,
VSB-Technical University of Ostrava,
17. Listopadu 15/2172,
Ostrava-Poruba 708 33, Czech Republic

Saburo Usami

Hitachi, Ltd.,
Hitachi-shi, Ibaraki-ken 319-1292, Japan

Valery Lacroix

Tractebel Engineering (ENGIE),
Bd. Simon Bolivar 34-36,
Brussels B-1000, Belgium

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received January 1, 2019; final manuscript received February 19, 2019; published online April 4, 2019. Assoc. Editor: Yun-Jae Kim.

J. Pressure Vessel Technol 141(3), 031101 (Apr 04, 2019) (6 pages) Paper No: PVT-19-1001; doi: 10.1115/1.4043081 History: Received January 01, 2019; Revised February 19, 2019

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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Fig. 1

Fatigue crack growth threshold ΔKth for ferritic steel provided by the ASME Code Section XI

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Fig. 2

Fatigue crack growth threshold expressed by Kmax of the definition of the ASME Code Section XI

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Fig. 3

Hysteresis loop and definition of crack closure

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Fig. 4

Crack closure models under negative R ratio

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Fig. 5

Fatigue crack growth rates for A 533B low alloy steel weldment in air environment at room temperature [11]

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Fig. 6

Proposal of fatigue thresholds ΔKth for ferritic steels in air environment



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