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Influence of specimen dimensions on the characteristics of cyclic crack resistance of heat-resistant steels. Report I

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Strength of Materials Aims and scope

Conclusions

  1. 1.

    For 15Kh2MFA(II) steels in the failure of which in specimens from 25- to 150-mm-thick plane strain conditions are maintained, the specimen thickness does not influence the fatigue crack growth rate and the characteristics Kth and Kfc.

  2. 2.

    For the plastic steels 15Kh2NMFA, 15Kh2MFA(I), and 08Kh18N10T, the fatigue failure of which is accompanied by the development of significant plastic deformations at the crack tip the influence of specimen thickness on the rules of fatigue crack growth is ambiguous in the case of presentation of the experimental data to da/dN−KImax coordinates and may appear in the whole range of change in KImax from Kth to K fQ .

  3. 3.

    Among the parameters of nonlinear fracture mechanics (J-integral, KIe, δ 0.1max ) investigated using as an example their use as characteristics determining the fatigue crack growth rate in specimens of different thickness of 15Kh2MFA(I) and 15Kh2NMFA steels only the crack tip opening δ 0.1max unambiguously determines the fatigue crack growth rate in the high-amplitude area.

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Authors
  1. V. T. Troshchenko
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  2. V. V. Pokrovskii
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  3. V. G. Kaplunenko
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Additional information

Institute of Strength Problems, Academy of Sciences of the Ukrainian SSR, Kiev. Translated from Problemy Prochnosti, No. 4, pp. 3–9, April, 1986.

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Troshchenko, V.T., Pokrovskii, V.V. & Kaplunenko, V.G. Influence of specimen dimensions on the characteristics of cyclic crack resistance of heat-resistant steels. Report I. Strength Mater 18, 419–425 (1986). https://doi.org/10.1007/BF01524059

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  • DOI: https://doi.org/10.1007/BF01524059

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