Abstract
On the basis of a new local probabilistic criterion of brittle fracture, a local criterion of ductile fracture proposed by the authors earlier, and the obtained approximate solution of the problem of stress-strain state near the crack tip, we develop a probabilistic model for the prediction of the crack resistance of pressure-vessel steels. The model enables one to predict the dependence of K Ic on temperature for any given probability of brittle fracture and the influence of the thickness of the specimen on K Ic. Bu using this model, we can also describe the temperature range of the brittle-ductile transition. The results of numerical calculations are compared with the experimental data for 15Kh2MFA pressure-vessel steel. It is shown that the proposed model fairly well describes the spread in the experimental data on the crack resistance of this type of steel.
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References
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TsNII KM “Prometei,” St. Petersburg, Russia. Translated from Problemy Prochnosti, No. 2, pp. 5–22, March–April, 1999.
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Margolin, B.Z., Gulenko, A.G. & Shvetsova, V.A. Probabilistic prediction of the crack resistance of nuclear pressure-vessel steels on the basis of a local approach. Part 2. Strength Mater 31, 107–119 (1999). https://doi.org/10.1007/BF02511100
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DOI: https://doi.org/10.1007/BF02511100