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Study of long-term cyclic strength under soft asymmetric and rigid loading

  • Scientific-Technical Section
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Strength of Materials Aims and scope

Conclusions

  1. 1.

    Experimental data obtained in the case of rigid loading on steel Kh18N9T at 600°C with rest periods during constant strain showed that rest periods in the tensile half-cycle are more damaging than during tensioncompression.

  2. 2.

    Rest periods in the compressive half-cycle on steel Kh18N9T increase its long-term ductility.

  3. 3.

    With soft asymmetric loading in the range r=−1.5 to −2.0 and rest periods under constant load conditions in the tensile half-cycle, the magnitude and sign of strain accumulation is determined by the maximum cycle, cycle asymmetry, and rest period duration. The same factors determine the nature of damage; with increasing cycle asymmetry the proportion of fatigue damage increases, and with increasing maximum stress and rest period duration the proportion of long-term static damage increases.

  4. 4.

    The strain-kinetic criterion of long-term cyclic failure satisfactorily describes damage during soft asymmetric (in the range r=−1.5 to−2.0) and rigid loading with rest periods.

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Authors
  1. G. G. Medeksha
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  2. V. P. Zhitkyavichene
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Additional information

Kaunas Polytechnic Institute. Translated from Problemy Prochnosti, No. 6, pp. 40–43, June, 1978.

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Medeksha, G.G., Zhitkyavichene, V.P. Study of long-term cyclic strength under soft asymmetric and rigid loading. Strength Mater 10, 657–660 (1978). https://doi.org/10.1007/BF01523897

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  • DOI: https://doi.org/10.1007/BF01523897

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