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Classically determined effective Delta K fails to quantify crack growth rates
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SYSNO ASEP 0531947 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Classically determined effective Delta K fails to quantify crack growth rates Author(s) Vojtek, Tomáš (UFM-A) ORCID
Pokorný, Pavel (UFM-A) ORCID
Oplt, Tomáš (UFM-A) ORCID
Jambor, Michal (UFM-A) ORCID, RID
Náhlík, Luboš (UFM-A) RID, ORCID
Herrero, D. (ES)
Hutař, Pavel (UFM-A) RID, ORCIDNumber of authors 7 Article number 102608 Source Title Theoretical and Applied Fracture Mechanics. - : Elsevier - ISSN 0167-8442
Roč. 108, AUG (2020)Number of pages 13 s. Language eng - English Country NL - Netherlands Keywords Crack closure ; effective Delta K ; Constraint ; Fatigue crack propagation ; Finite element analysis ; Steel Subject RIV JG - Metallurgy OECD category Materials engineering R&D Projects LQ1601 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) FV40327 GA MPO - Ministry of Industry and Trade (MPO) Method of publishing Open access Institutional support UFM-A - RVO:68081723 UT WOS 000552039000041 EID SCOPUS 85083893647 DOI 10.1016/j.tafmec.2020.102608 Annotation Decomposition of the resistance to fatigue crack growth into the intrinsic and extrinsic component is very important for understanding of fatigue failure mechanisms, relation to microstructure and modelling of residual fatigue life. Crack closure for four grades of steel were estimated by the difference between K-max values and the effective Delta K-eff values (measured at the load ratio R = 0.8) corresponding to the same crack growth rate. The results showed that crack closure values obtained by the difference K-max - Delta K-eff were not in agreement with the available crack closure models, both the Newman's model of plasticity-induced closure and the results from finite element analysis. The discrepancies could not be explained by the effect of mean stress, specimen thickness, loading amplitude or T-stress. Therefore, the application of fracture mechanics to fatigue cracks should be revisited. It was pointed out that Delta K-eff may not be a good parameter for quantification of the crack driving force, since the relationship between K-max - K-cl and the cyclic plastic deformation at the crack tip might not be linear. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2021 Electronic address https://www.sciencedirect.com/science/article/pii/S0167844220301841?via%3Dihub
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