Conclusions
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1.
As a result of experimental investigations it was shown that the application of equations of the Coffin-Manson type under conditions of nonproportional cyclic loading may lead to substantial errors in the evaluation of the endurance of a material. For some regimes of complex loading the number of cycles to failure came out four or five times higher when calculated. by Eq. (9).
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2.
The energy approach and the concept of damage cumulation show good agreement between theoretical and experimental results, and they may therefore be recommended for the stress analysis of structures operating under conditions of complex low cycle loading.
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3.
The multisurface theory of plastic flow in the form suggested by Garud [10] made it possible to describe qualitatively and with a sufficient degree of accuracy also quantitatively the cyclic strain diagrams of steel Kh18N10T with nonproportional loading paths.
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Kiev Polytechnic Institute. Translated from Problemy Prochnosti, No. 10, pp. 47–54, October, 1988.
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Mozharovskii, N.S., Shukaev, S.N. Endurance of structural materials with nonproportional paths of low cycle loading. Strength Mater 20, 1328–1336 (1988). https://doi.org/10.1007/BF01531547
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DOI: https://doi.org/10.1007/BF01531547