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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June 2017
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Reference Curve of Fatigue Crack Growth for Ferritic Steels Under Negative R Ratio Provided by ASME Code Section XI
Kunio Hasegawa,
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
VSB-Technical University of Ostrava,
17. Listopadu 15/2172,
Ostrava-Poruba 708 33, Czech Republic
e-mail: kunioh@ kzh.biglobe.ne.jp
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Vratislav Mares,
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
VSB-Technical University of Ostrava,
17. listopadu 15/2172,
Ostrava-Poruba 708 33, Czech Republic
e-mail: vratislav.mares@vsb.cz
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Yoshihito Yamaguchi
Yoshihito Yamaguchi
Japan Atomic Energy Agency (JAEA),
Tokai-Mura, Naka-Gun,
Ibaraki-Ken 319-1195, Japan
e-mail: yamaguchi.yoshihiro @jaea.go.jp
Tokai-Mura, Naka-Gun,
Ibaraki-Ken 319-1195, Japan
e-mail: yamaguchi.yoshihiro @jaea.go.jp
Search for other works by this author on:
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
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
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
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. Jun 2017, 139(3): 034501 (5 pages)
Published Online: October 11, 2016
Article history
Received:
April 1, 2016
Revised:
August 20, 2016
Citation
Hasegawa, K., Mares, V., and Yamaguchi, Y. (October 11, 2016). "Reference Curve of Fatigue Crack Growth for Ferritic Steels Under Negative R Ratio Provided by ASME Code Section XI." ASME. J. Pressure Vessel Technol. June 2017; 139(3): 034501. https://doi.org/10.1115/1.4034586
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