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Multiaxial Fatigue Life Prediction Based on Short Crack Propagation Model with Equivalent Strain Parameter

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Abstract

The maximum shear strain and the normal strain excursion on the critical plane are regarded as the primary parameters of the crack driving force to establish a new short crack model in this paper. An equivalent strain-based intensity factor is proposed to correlate the short crack growth rate under multiaxial loading. According to the short crack model, a new method is proposed for multiaxial fatigue life prediction based on crack growth analysis. It is demonstrated that the method can be used under proportional and non-proportional loadings. The predicted results showed a good agreement with experimental lives in both high-cycle and low-cycle regions.

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[from Inconel 718 data (Ref 33)]

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Acknowledgments

The authors gratefully acknowledge the financial support of the National Natural Science Foundation of China (51535001, 11572008) and the Specialized Research Fund for the Doctoral Program of Higher Education (No. 20131103120024).

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Authors and Affiliations

  1. College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing, 100124, People’s Republic of China

    Xiang-Feng Zhao, De-Guang Shang, Yu-Juan Sun, Ming-Liang Song & Xiao-Wei Wang

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  1. Xiang-Feng Zhao
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Correspondence to De-Guang Shang.

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Zhao, XF., Shang, DG., Sun, YJ. et al. Multiaxial Fatigue Life Prediction Based on Short Crack Propagation Model with Equivalent Strain Parameter. J. of Materi Eng and Perform 27, 324–332 (2018). https://doi.org/10.1007/s11665-017-3075-y

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  • DOI: https://doi.org/10.1007/s11665-017-3075-y

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