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Origin of two linear segments in the fracture diagram in crack resistance tests

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Strength of Materials Aims and scope

Conclusions

  1. 1.

    The breaks in the P-V diagrams are due to residual stresses in the specimen acquired at a certain stage of the technological process of its production or testing (welding stresses, stresses after plastic deformation, test temperature, etc.).

  2. 2.

    One of the chief causes of the appearance of breaks is an impermissibly harsh regime of fagituecrack formation.

  3. 3.

    To determine the true values of the crack resistance of a material (KIc), it is imperative that there be no breaks at all in the fracture diagram. Otherwise these values are exaggerated on account of the residual compressive stresses.

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Literature cited

  1. E-399-72. “Standard method of plain-strain (KIc) toughness testing,” in: Book of Standards, ASTM (1972), p. 31.

  2. Stress Analysis and Strength Tests in Engineering. Methods of Mechanical Tests of Metals. Determination of the Characteristics of Resistance to Crack Formation in Static Loading: Methodological Instructions [in Russian], VNIINmash, Moscow (1978).

  3. W. Brown and G. Srowley, Plain-Strain Fracture Toughness Testing of High-Strength Metallic Materials [Russian translation] Mir, Moscow (1972).

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  4. I. A. Birger, Residual Stresses [in Russian], Mashgiz, Moscow (1963).

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  5. N. S. Kogut, M. Z. Tagirov, and O. V. Berdnikov, “The effect of the conditions of previous loading in matching cracks to the magnitude of the crack resistance of materials,” Zavod. Lab.,43, No. 6, 734–737 (1977).

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Authors and Affiliations

  1. Industrial Association “Izhorskii Zavod,”, Leningrad

    V. A. Volkov & A. S. Dukhovnyi

Authors
  1. V. A. Volkov
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  2. A. S. Dukhovnyi
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Additional information

Translated from Problemy Prochnosti, No. 8, pp. 35–39, August, 1981.

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Volkov, V.A., Dukhovnyi, A.S. Origin of two linear segments in the fracture diagram in crack resistance tests. Strength Mater 13, 980–984 (1981). https://doi.org/10.1007/BF00762166

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  • DOI: https://doi.org/10.1007/BF00762166

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