Determination of the structural steels damage kinetics under non-stationary loading https://doi.org/10.33108/visnyk_tntu2018.01.005
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Abstract
The article presents adapted techniques which make possible to assess the damage of steels at high cyclic fatigue under the amplitudes varying according to the random law. The method for material damage assessment is based on the LM-hardness method. The method for estimation of the fatigue damage kinetics under
random asymmetric fatigue loading is based on the use of ultimate exhaustion of cyclic plasticity model (UECP).
To confirm the mentioned methods experimental results were obtained testifying the possibility of using them for estimation of steels residual lifetime under non-stationary loading. The article describes : the method, that allows
laboratory samples fatigue testing under the amplitudes varying according to the random law; analysis of residual lifetime is using the proposed model and LM-hardness method; creation of the analytical model, that enables to
predict fatigue lifetime under the amplitudes changing according to the random law. The presented results can be used for the lifetime estimation of structural elements operating under hard load conditions with the lower error, than those of the stabilized values of inelastic deformations and the known hypotheses of fatigue damage summation.
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