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Low-Cycle Fatigue and Ratcheting Lifetime Estimation of a 7050-T6 Aluminum Alloy

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Strength of Materials Aims and scope

Low-cycle fatigue properties and uniaxial ratcheting behavior of a 7050-T6 aluminum alloy were investigated by a non-symmetric cycle stress tests at the normal temperature. The low-cycle fatigue behavior of the alloy was evaluated. The effect of the stress rate, stress amplitudes, and mean stresses on its ratcheting performance was discussed. Considering the ratcheting effect and special working conditions that large mean stresses and small stress amplitudes, based on the same properties under loading, a new fatigue life prediction empirical equation was proposed to estimate the ratcheting life. The results prove that the ratcheting strain of the alloy depends on the stress amplitudes and mean stresses, whereas the stress rate almost has no effect on the ratcheting behavior on account of the rate-independent feature of the material. This equation can give a precise estimate of the ratcheting behavior of large mean stresses and their small amplitudes.

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Authors and Affiliations

  1. College of Mechanical Engineering, Sichuan University of Science & Engineering, Zigong, China

    L. Fu & Y. R. Luo

  2. School of Aeronautics and Astronautics, Sichuan University, Chengdu, China

    L. Fu & Q. Y. Wang

  3. Faculty of Civil Engineering and Architecture, Kunming University of Science and Technology, Kunming, China

    H. Duan & J. Yao

  4. School of Materials Science and Engineering, Sichuan University of Science & Engineering, Zigong, China

    L. Lin

  5. School of Civil Engineering, Sichuan University of Science & Engineering, Zigong, China

    Y. Q. Zhang

  6. Failure Mechanics & Engineering Disaster Prevention and Mitigation, Key Laboratory of Sichuan Province, Sichuan University, Chengdu, China

    Q. Y. Wang

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  1. L. Fu
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Correspondence to J. Yao.

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Translated from Problemy Prochnosti, No. 4, pp. 113 – 123, July – August, 2020.

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Fu, L., Duan, H., Wang, Q.Y. et al. Low-Cycle Fatigue and Ratcheting Lifetime Estimation of a 7050-T6 Aluminum Alloy. Strength Mater 52, 596–606 (2020). https://doi.org/10.1007/s11223-020-00211-9

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  • DOI: https://doi.org/10.1007/s11223-020-00211-9

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