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Effect of test piece length on the fatigue strength of steel in air

  • R. G. Pogoretskii
Article

Summary

  1. 1.

    It is established that the scale factor for short fatigue test pieces is a function of their diameter, length, and shoulder radius, the latter parameter having no effect on the fatigue properties of long test pieces.

     
  2. 2.

    Our results, demonstrating the dependence of the endurance limit (the principal fatigue strength characteristic) on the length and, consequently, the volume of the test piece, lend support to the statistical theory of the scale factor, the validity of which was doubtful before the existence of such a relationship was established.

     
  3. 3.

    The results of the present investigation show that the resistance of materials to cyclic stresses should be determined on test pieces of two distinct types: either on test pieces of “zero” length (as recommended by a new draft Soviet standard) which are least affected by the scale factor (Fig. 3), or on specimens long enough to exclude the effect of the shoulder radius.

     

Keywords

Fatigue Statistical Theory Fatigue Strength Fatigue Test Distinct Type 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    O. Horger, “Effect of surface rolling on the fatigue strength of steel,” Journal of Appl. Mechanics, N 3, 1936.Google Scholar
  2. 2.
    Yu. Yu. Slavenas, “The problem of the scale factor in fatigue tests on steel,” Trudy kaunasskogo politekhnicheskogo in-ta, vol. 4, 1957.Google Scholar
  3. 3.
    Yu. I. Babei, “Machine IMA 30 for fatigue tests on metals in various media.” In: Metal Testing Equipment [in Russian], Izd-vo AN UkrSSR, Kiev, 1961.Google Scholar
  4. 4.
    R. G. Pogoretskii and M. M. Matseiko, “Machine IMA 5 for fatigue tests on metals in liquid media.” In: The Effect of Operating Media on the Properties of Materials [in Russian], Izd-vo AN UkrSSR, Kiev, no. 3, 1964.Google Scholar

Copyright information

© The Faraday Press, Inc. 1966

Authors and Affiliations

  • R. G. Pogoretskii
    • 1
  1. 1.Institute of Physics and Mechanics AS UkrSSRL'vov

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