Conclusions
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1.
The growth rate of fatigue cracks can be determined on cylindrical samples with a ring notch by the method of recording the deflection of the sample.
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2.
The critical crack length corresponding to the beginning of the transition to the stage of accelerated growth at stress amplitudes close to the fatigue limit is correlated with fractographic data.
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3.
Sections of stable crack growth are observed regardless of the stress amplitude and testing temperature (above room temperature).
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Literature cited
V. V. Kruchinin and Yu. D. Sofronov, "Determining the propagation rate of fatigue cracks from the deflection of the sample," in: Strength of Metals under Cyclic Loads [in Russian], Nauka, Moscow (1967), p. 107.
Ya. S. Segal, "Determining the laws governing the development of fatigue cracks by recording the deflection of the sample," in: Fatigue of Metals [in Russian], Nauka, Moscow (1971), p. 65.
L. Maslov and M. Arita, Fourth International Conference on Fracture Waterloo, Canada (1977).
I. V. Kudryavtsev, "Fatigue strength of steel parts with surface defects in the from of fine cracks," in: Strength of Steel [in Russian], No. 40, Mashgiz, Moscow (1951), p. 33.
P. I. Kudryavtsev, "Change in nominal stress at the root of a circular fatigue crack," Zavod. Lab.,35, 95 (1969).
Additional information
A. A. Baikov Institute of Metallurgy. Shipbuilding Research Institute, Tokyo. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 3, pp. 31–35, March, 1979.
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Maslov, L.I., Arita, M. & Lebedeva, A.I. Change in the growth rate of fatigue cracks in samples with a ring notch. Met Sci Heat Treat 21, 201–205 (1979). https://doi.org/10.1007/BF00774761
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DOI: https://doi.org/10.1007/BF00774761