Multiaxial fatigue life prediction for metallic materials considering loading path and additional hardening effect
International Journal of Structural Integrity
ISSN: 1757-9864
Article publication date: 10 May 2022
Issue publication date: 23 May 2022
Abstract
Purpose
A large number of data have proved that under the same von Mises equivalent strain condition, the fatigue life under multiaxial non-proportional loading is often much lower than the life under multiaxial proportional loading. This is mainly due to the influence of the non-proportional loading path and the additional hardening effect, which lead to a sharp decrease in life.
Design/methodology/approach
The modulus attenuation effect is used to modify the static hardening coefficient, and the predicted value obtained is closer to the additional hardening coefficient obtained from the experiment. A fatigue life model can consider non-proportional paths, and additional hardening effects are proposed. And the model uses multiaxial fatigue test data to verify the validity and adaptability of the new model. The life prediction accuracy and material application range are satisfactory.
Findings
Because loading path and additional hardening of the material affect fatigue life, a new multiaxis fatigue life model based on the critical plane approach is proposed. And introducing a non-proportional additional damage coefficient, the joint influence of the load path and the additional hardening can be considered. The model's life prediction accuracy and material applicability were verified with multiaxial fatigue test data of eight materials and nine loads compared with the prediction accuracy of the Kandil–Brown–Miller (KBM) model and Fatemi–Socie (FS) model.
Originality/value
The physical meaning of the new model is clear, convenient for practical engineering applications.
Keywords
Acknowledgements
The authors thanks all the undersigned authors who contribute to this manuscript.
Funding: No funding support.
Author contributions: Conceptualization and methodology were performed by Ma Muzhou and Liu Xintian, data curation was performed by Ma Muzhou, supervision was performed by Liu Xintian and Ma Muzhou and reviewing and editing were performed by Liu Xintian. The first draft of the manuscript was written by Ma Muzhou and both authors commented on previous versions of the manuscript. Both authors read and approved the final manuscript.
Conflict of interest statement: The authors declare that the authors have no financial and personal relationships with other people or organizations that can inappropriately influence our work; there is no professional or other personal interest of any nature or kind in any product, service and/or company that could be construed as influencing the position presented in, or the review of, the manuscript entitled.
Citation
Ma, M. and Liu, X. (2022), "Multiaxial fatigue life prediction for metallic materials considering loading path and additional hardening effect", International Journal of Structural Integrity, Vol. 13 No. 3, pp. 534-563. https://doi.org/10.1108/IJSI-03-2022-0023
Publisher
:Emerald Publishing Limited
Copyright © 2022, Emerald Publishing Limited