Probabilistic description of the cyclic R-curve based on microstructural barriers
Vaara, Joona; Kärkkäinen, Kimmo; Väntänen, Miikka; Kemppainen, Jukka; Schönbauer, Bernd; More, Suraj; Åman, Mari; Frondelius, Tero (2025-04-02)
Elsevier
02.04.2025
Vaara, J., Kärkkäinen, K., Väntänen, M., Kemppainen, J., Schönbauer, B., More, S., Å Man, M., & Frondelius, T. (2025). Probabilistic description of the cyclic R-curve based on microstructural barriers. International Journal of Fatigue, 198, 108953. https://doi.org/10.1016/j.ijfatigue.2025.108953.
https://creativecommons.org/licenses/by/4.0/
© 2025 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
https://creativecommons.org/licenses/by/4.0/
© 2025 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
https://creativecommons.org/licenses/by/4.0/
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:oulu-202504232868
https://urn.fi/URN:NBN:fi:oulu-202504232868
Tiivistelmä
Abstract
A model for the probabilistic cyclic R-curve has been derived. The model is based on the commonly used hypothesis of consecutive microstructural barrier fronts defining the erratic behavior of microstructurally short cracks and the transition to physically short cracks with declining importance of the microstructural features. The model can describe the linkage between the traditional cyclic R-curve analyses and the El-Haddad type Kitagawa-Takahashi diagrams with the asymptotic fatigue limit at small defect sizes. The model fit against the experimental non-propagating crack lengths perfectly matches the observed and predicted fatigue limit for several defect types and sizes. The presented framework can be used to analyze any geometry, loading history, or defect configuration, including defect interaction problems.
A model for the probabilistic cyclic R-curve has been derived. The model is based on the commonly used hypothesis of consecutive microstructural barrier fronts defining the erratic behavior of microstructurally short cracks and the transition to physically short cracks with declining importance of the microstructural features. The model can describe the linkage between the traditional cyclic R-curve analyses and the El-Haddad type Kitagawa-Takahashi diagrams with the asymptotic fatigue limit at small defect sizes. The model fit against the experimental non-propagating crack lengths perfectly matches the observed and predicted fatigue limit for several defect types and sizes. The presented framework can be used to analyze any geometry, loading history, or defect configuration, including defect interaction problems.
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