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Influence of service time on the crack resistance of the material of the housing of a freight car automatic coupler

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Strength of Materials Aims and scope

Conclusions

  1. 1.

    Depending upon test temperature (293 and 213 K) and level of stress intensity factor Kmax the service time (11–31 yr) either does not influence the fatigue crack growth rate or leads to a reduction in it in 20L steel in the medium amplitude region of the kinetic fatigue failure curve.

  2. 2.

    An increase in service time to 31 yr causes a significant (to almost a third) decrease in the critical crack opening of 20L steel specimens in static loading under room temperature conditions.

  3. 3.

    With an increase in service time there is a reduction in the critical stress intensity factors in static (K max0 , K 5%0 ) and cyclic (K 1fc , K cfc ) loading and in this case the minimum cyclic fracture toughness K 1fc is the most sensitive characteristic.

  4. 4.

    Cyclic loading significantly (by 1.6–2.6 times) reduces the fracture toughness K 1fc in comparison with K maxQ of 20L steel. The larger relative reduction in K 1fc corresponds to the maximum service time.

  5. 5.

    In brittle strength calculations of the material of automatic couplers operating under low climate temperature conditions it is necessary to use the fracture toughness characteristics taking into consideration the influence of service time on these characteristics.

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Authors
  1. V. V. Pokrovskii
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  2. P. V. Yasnii
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  3. N. A. Kostenko
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  4. Yu. V. Tkach
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  5. S. L. Mishakov
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Additional information

Institute of Strength Problems, Academy of Sciences of the Ukrainian SSR, Kiev and Bryansk. Translated from Problemy Prochnosti, No. 2, pp. 28–32, February, 1988.

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Pokrovskii, V.V., Yasnii, P.V., Kostenko, N.A. et al. Influence of service time on the crack resistance of the material of the housing of a freight car automatic coupler. Strength Mater 20, 167–172 (1988). https://doi.org/10.1007/BF01522917

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  • DOI: https://doi.org/10.1007/BF01522917

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