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Determination of the Period of Subcritical Growth of Small Plane High-Temperature Creep Cracks in Structural Elements

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We formulate a computation model (differential equation with initial and final conditions) for the determination of the period of subcritical growth of small plane high-temperature creep cracks in structural elements. The model is based on the first law of thermodynamics, determination of the energy components of deformation of the process zone near the crack contour via the parameters of its opening, and approximate reduction of the process of creep of the material to a period of steady-state creep. The formulas for the approximate evaluation of the opening displacements of the process zone via the stress intensity factor and the mean values of loading of the structural elements are proposed. The method of equivalent areas generalized for the deformation parameters is used for the approximate solution of the problem. By using this method and the experimental data known from the literature for specific materials, we determine the period of subcritical growth of a small surface semielliptic high-temperature creep crack under the conditions of long-term static tension in a half space.

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Authors and Affiliations

  1. I. Franko National University of Lviv, Lviv, Ukraine

    О. Ye. Andreikiv & І. Ya. Dolinska

  2. Karpenko Physicomechanical Institute, National Academy of Sciences of Ukraine, Lviv, Ukraine

    О. Ye. Andreikiv & І. Ya. Dolinska

Authors
  1. О. Ye. Andreikiv
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  2. І. Ya. Dolinska
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Correspondence to О. Ye. Andreikiv.

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Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 57, No. 2, pp. 16–23, March–April, 2021.

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Andreikiv, О.Y., Dolinska, І.Y. Determination of the Period of Subcritical Growth of Small Plane High-Temperature Creep Cracks in Structural Elements. Mater Sci 57, 154–162 (2021). https://doi.org/10.1007/s11003-021-00526-1

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  • DOI: https://doi.org/10.1007/s11003-021-00526-1

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