Conclusions
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1.
During propagation, the surface crack tends to assume a stable form with the ratio a/2b it was 0.41–0.45, irrespective of the level of applied stress, cycle asymmetry coefficient R, shape of the specimen, initial notch geometry, steel grade, and the presence of an anticorrosion deposit. At the semiaxes ratio a/b=0.75 the values of SIF at the deepest point and on the surface of the specimen coincide.
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2.
In the 15Kh2NMFA and 10GN2MFA steels the increase of the positive values of the cycle asymmetry coefficient at the same values of Kmax at room temperature reduces the fatigue crack propagation rate in the mean-amplitude section of the kinetic diagram of fatigue failure.
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Literature Cited
A. S. Podgornyi and G. K. Sharshukov, “Examination of propagation of blind cracks in repeated loading,” Fiz.-Khim. Mekh. Mater.,15, No. 6, 63–66 (1979).
J. Dufresne, “Probabilistic application of fracture mechanics,” in: Preprints of the 5th International Fracture Conference on Advances in Fracture Research,” Vol. 2 (1981), pp. 517–531.
Additional information
Scientific and Production Organization of Engineering Technology of the Central Scientific-Research Institute of Heavy Engineering, Moscow, Volgodonsk. Translated from Problemy Prochnosti, No. 9, pp. 47–49, September, 1987.
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Popov, A.A., Zhivov, A.N. Relationships governing surface crack propagation in 15Kh2NMFA and 10GN2MFA steels in low-cycle loading. Strength Mater 19, 1233–1236 (1987). https://doi.org/10.1007/BF01523380
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DOI: https://doi.org/10.1007/BF01523380