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Fatigue life prediction of continuous fiber reinforced polymers under multiaxial loading conditions based on the critical plane approach

The design process of structural elements made from composite materials is highly complex due to their anisotropy, which results in multiaxial stress, even under uniaxial load. Although there is a significant amount of research on the damage of composite materials in the fatigue regime, there are still areas where a more practical approach for life estimation should be developed, especially for out-of-phase multiaxial fatigue of continuous fiber polymers. Currently, frequently used methods are very complicated and require comprehensive experimental data, which limits their use. These facts lead to the development of an approach to address these challenges.

This research presents the application of a critical plane parameter for multiaxial loading conditions for continuous fiber…

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The design process of structural elements made from composite materials is highly complex due to their anisotropy, which results in multiaxial stress, even under uniaxial load. Although there is a significant amount of research on the damage of composite materials in the fatigue regime, there are still areas where a more practical approach for life estimation should be developed, especially for out-of-phase multiaxial fatigue of continuous fiber polymers. Currently, frequently used methods are very complicated and require comprehensive experimental data, which limits their use. These facts lead to the development of an approach to address these challenges.

This research presents the application of a critical plane parameter for multiaxial loading conditions for continuous fiber composite materials. The authors conducted an experimental campaign on the fatigue life of carbon fiber reinforced polymer (CFRP) composites, taking into consideration three load ratios (R) as well as in-phase and out-of-phase loadings. In total, 9 different sets of data for constant biaxiality λt were investigated and analyzed, including thorough macroscopic post-failure analysis. The finite element analysis gave the critical stress area, which allowed the calculation of the damage parameter. The extremum damage value defined the critical plane, finally used to correlate the data and predict fatigue life. This approach was verified with the literature's experimental data for glass fiber reinforced polymer (GFRP) and the authors' experimental data for CFRP. Although those materials exhibit a similar fracture nature, they differ significantly in many aspects, i.e., fiber orientation, layup configuration, constituent materials, and stiffness properties. This investigation and comparison show that the proposed damage modeling is suited for continuous fiber composite materials under multiaxial loading. Fatigue data also enabled the estimation of fatigue life based on the uniaxial tensile test, showing that long-life fatigue strength is 25% of the ultimate tensile strength, based on which S-N line can be constructed for fatigue performance prediction.

Artikelnummer
ICMFF14-2025-19

Titel
Fatigue life prediction of continuous fiber reinforced polymers under multiaxial loading conditions based on the critical plane approach
Autor(en)
S. J. Duda, M. Smolnicki, G. Lesiuk, A. Fatemi
DOI
10.48447/ICMFF14-2025-19
Veranstaltung
14. International Conference on Multiaxial Fatigue and Fracture 2025
Jahr der Veröffentlichung
2025
Publikationsart
Tagungsmanuskript (PDF)
Sprache
Englisch
Stichwörter
Multiaxial fatigue,Continuous fiber composites,FS damage parameter,Fatigue life prediction