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Brittle fracture resistance

  • Strength Properties
  • Published:
Metal Science and Heat Treatment Aims and scope

Conclusions

  1. 1.

    The brittle fracture mechanism was considered taking into consideration the results of earlier conducted works [29, 35, 46].

  2. 2.

    To determine the brittle strength of iron alloys the equation

    $$\sigma _{br} \cong 20 000\sqrt {\frac{r}{l},} $$

    where r is the radius at the crack tip (most probable 0.01 μm<r,0.1 μm) and ℓ is the crack length, which equal to the grain diameter (10–100 μm), is proposed.

  3. 3.

    The values of brittle strength calculated using the porposed equation are a minimum since it does not take into consideration the energy consumed in overcoming obstacles to the growing crack in microplastic deformation. Grain boundaries are such obstacles. In brittle fracture the boundaries are more plastic than the volume of the grain and in ductile fracture the opposite.

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Articles published in Metallovedenie i Termicheskaya Obrabotka Metallov (metal science and heat treatment) on problems of brittle fracture

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Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 2, pp. 21–26, February, 1992.

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Gulyaev, A.P. Brittle fracture resistance. Met Sci Heat Treat 34, 110–119 (1992). https://doi.org/10.1007/BF00769877

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