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Fatigue Life Prediction by a Local Stress-Strain Criterion for Hole-Containing Specimens After Precompression of Their Material

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Strength of Materials Aims and scope

The fatigue life prediction method for structure elements with the material precompression in the hole vicinity is proposed. The method is a further step in evolving the approach to life prediction from a local stress-strain state that is based on the energy criterion of fatigue fracture. Residual stresses arising from the material compression in the hole vicinity were evaluated by the finite element method. The problem of contact interaction of the punch profile with corresponding specimen portions was solved in the physically nonlinear statement. The nonlinear behavior of the hole-containing strip material under elastoplastic deformation was simulated with the multilinear model, including kinematic hardening. In life calculations, residual compression stresses were accounted for by introducing additional fictitious ones into the load cycle. The variation of fatigue material characteristics under asymmetric loading were considered by introducing the additional function derived from the test results for smooth specimens under symmetrical loading. Computational results were compared with fatigue test data. For this, D16AT and V95pchT2 aluminum alloy flat specimens with material precompression in the hole vicinity were tested under regular and program loading. Regular loading was realized by a zero-to-tension stress cycle, the program one was effected witch the stepped program equivalent to the damage during the combined operation of a multi-purpose aircraft. Satisfactory agreement between calculation data and experimental results was noted.

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Authors and Affiliations

  1. Zhukovsky National Aerospace University “Kharkov Aviation Institute”, Kharkov, Ukraine

    P. A. Fomichev & A. V. Zarutskii

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  1. P. A. Fomichev
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  2. A. V. Zarutskii
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Correspondence to A. V. Zarutskii.

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Translated from Problemy Prochnosti, No. 2, pp. 26 – 35, March – April, 2019.

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Fomichev, P.A., Zarutskii, A.V. Fatigue Life Prediction by a Local Stress-Strain Criterion for Hole-Containing Specimens After Precompression of Their Material. Strength Mater 51, 193–201 (2019). https://doi.org/10.1007/s11223-019-00065-w

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  • DOI: https://doi.org/10.1007/s11223-019-00065-w

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