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Method for the determination of the characteristics of crack resistance of elastoplastic materials

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Materials Science Aims and scope

We propose a procedure for the determination of the level of strains, the length of the plastic zone, and crack-tip opening displacements based on the use of the digital speckle-correlation method and the data of strain-gauge measurements under the conditions of uniaxial and biaxial tension of a plate weakened by a central crack. It is experimentally established that the size of the plastic zone near the crack tip for a given material is independent of the gauge length but changes if we pass to biaxial loading. On the basis of the solution of the elastoplastic problem of limiting equilibrium of a plate weakened by a crack obtained within the framework of the δ c -model, we deduce the formula for the evaluation the mean value of crack resistance of the material (\( {\tilde{\delta }_c} \)) and the length of the plastic zone (lp *). The influence of biaxial loading on the size of this zone is estimated.

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Authors and Affiliations

  1. Karpenko Physicomechanical Institute, Ukrainian National Academy of Sciences, Lviv, Ukraine

    Ya. L. Ivanyts’kyi & S. Т. Shtayura

  2. Technical University of Radom, Radom, Poland

    M. Kowalik

Authors
  1. Ya. L. Ivanyts’kyi
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  2. S. Т. Shtayura
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  3. M. Kowalik
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Correspondence to S. Т. Shtayura.

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Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol.48, No.1, pp.19–25, January–February, 2012.

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Ivanyts’kyi, Y.L., Shtayura, S.Т. & Kowalik, M. Method for the determination of the characteristics of crack resistance of elastoplastic materials. Mater Sci 48, 12–19 (2012). https://doi.org/10.1007/s11003-012-9467-0

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  • DOI: https://doi.org/10.1007/s11003-012-9467-0

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