Crack Initiation Mechanism and Life Prediction of Ti60 Titanium Alloy Considering Stress Ratios Effect in Very High Cycle Fatigue Regime

Ruixiang He, Haotian Peng, Fulin Liu, Muhammad Kashif Khan, Yao Chen, Chao He, Chong Wang, Qingyuan Wang, Yongjie Liu

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    Abstract

    Ultrasonic fatigue tests were performed on Ti60 titanium alloy up to a very high cycle fatigue (VHCF) regime at various stress ratios to investigate the characteristics. The S-N curves showed continuous declining trends with fatigue limits of 400, 144 and 130 MPa at 10 cycles corresponding to stress ratios of R = -1, 0.1 and 0.3, respectively. Fatigue cracks found to be initiated from the subsurface of the specimens in the VHCF regime, especially at high stress ratios. Two modified fatigue life prediction models based on fatigue crack initiation mechanisms for Ti60 titanium alloy in the VHCF regime were developed which showed good agreement with the experimental data.
    Original languageEnglish
    Article number2800
    Number of pages15
    JournalMaterials
    Volume15
    Issue number8
    DOIs
    Publication statusPublished - 11 Apr 2022

    Bibliographical note

    Copyright: © 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/).

    Funder

    Funding: This work was supported by the National Natural Science Research Funds of China (No. 12172238, No. 11832007, No.12022208, and No. 12072212).

    Keywords

    • Ti60 titanium alloy
    • fatigue failure mechanism
    • fatigue life prediction
    • fatigue strength prediction
    • stress ratio
    • very high cycle fatigue

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics

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