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Analysis of the velocity dependence of fracture toughness in pulsed loading of steel 40Kh

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Strength of Materials Aims and scope

Conclusions

  1. 1.

    The velocity dependence of dynamic fracture toughness can be evaluated by the method of quantitative stereoscopic fractography within a broad range of loading rates.

  2. 2.

    For steel 40Kh the ascending branch of the velocity dependence of KId is determined by fragmentation of the structure causing ramification of the crack which, in the final analysis, increases fracture toughness. The reduced size of the microcrack in fragmentation is directly connected with the weakening of the dependence of crack resistance on the loading rate [19], which in our experiments corresponds to the range of impact speeds of 300–600 m/sec.

  3. 3.

    Removal of microsegregations from the boundaries forming upon fragmentation of blocks in the structure (by means of diffusion) increases the surface energy of such boundaries, impedes the formation of microcracks on them, and consequently increases fracture toughness.

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Authors
  1. A. Ya. Krasovskii
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  2. V. A. Makovei
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  3. G. N. Nadezhdin
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  4. V. L. Svechnikov
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  5. G. V. Stepanov
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Additional information

Institute of Strength Problems, Academy of Sciences of the Ukrainian SSR, Kiev. Translated from Problemy Prochnosti, No. 2, pp. 3–8, February, 1988.

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Krasovskii, A.Y., Makovei, V.A., Nadezhdin, G.N. et al. Analysis of the velocity dependence of fracture toughness in pulsed loading of steel 40Kh. Strength Mater 20, 137–142 (1988). https://doi.org/10.1007/BF01522911

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  • DOI: https://doi.org/10.1007/BF01522911

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