Technical Brief

Reference Curve of Fatigue Crack Growth for Ferritic Steels Under Negative R Ratio Provided by ASME Code Section XI

[+] Author and Article Information
Kunio Hasegawa

Center of Advanced Innovation Technologies,
VSB-Technical University of Ostrava,
17. Listopadu 15/2172,
Ostrava-Poruba 708 33, Czech Republic
e-mail: kunioh@ kzh.biglobe.ne.jp

Vratislav Mares

Center of Advanced Innovation Technologies,
VSB-Technical University of Ostrava,
17. listopadu 15/2172,
Ostrava-Poruba 708 33, Czech Republic
e-mail: vratislav.mares@vsb.cz

Yoshihito Yamaguchi

Japan Atomic Energy Agency (JAEA),
Tokai-Mura, Naka-Gun,
Ibaraki-Ken 319-1195, Japan
e-mail: yamaguchi.yoshihiro @jaea.go.jp

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received April 1, 2016; final manuscript received August 20, 2016; published online October 11, 2016. Assoc. Editor: David L. Rudland.

J. Pressure Vessel Technol 139(3), 034501 (Oct 11, 2016) (5 pages) Paper No: PVT-16-1059; doi: 10.1115/1.4034586 History: Received April 01, 2016; Revised August 20, 2016

Reference curves of fatigue crack growth rates for ferritic steels in air environment are provided by the ASME Code Section XI Appendix A. The fatigue crack growth rates under negative R ratio are given as da/dN versus Kmax. It is generally well known that the growth rates decreases with decreasing R ratios. However, the da/dN as a function of Kmax are the same curves under R = 0, −1, and −2. In addition, the da/dN increases with decreasing R ratio for R < −2. This paper converts from da/dN versus Kmax to da/dN versus ΔKI, using crack closure U. It can be obtained that the growth rates da/dN as a function of ΔKI decrease with decreasing R ratio for −2 ≤ R < 0. It can be seen that the growth rate da/dN versus ΔKI is better equation than da/dN versus Kmax from the view point of stress ratio R. Furthermore, extending crack closure U to R = −5, it can be explained that the da/dN decreases with decreasing R ratio in the range of −5 ≤ R < 0. This tendency is consistent with the experimental data.

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Fig. 1

Reference curves of fatigue crack growth rates provided by ASME Code Section XI, Appendix A [1]

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Fig. 2

Proposed crack closure models

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Fig. 3

Reference fatigue crack growth curves expressed by ΔKI

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Fig. 4

Fatigue crack growth rates for ferritic steels in air environment [2]

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Fig. 5

Extension of crack closure U below R = −2

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Fig. 6

Proposed reference fatigue crack growth rate curves under negative R ratio



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