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The effect of a free surface on fatigue crack behaviour
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SYSNO ASEP 0354030 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title The effect of a free surface on fatigue crack behaviour Author(s) Hutař, Pavel (UFM-A) RID, ORCID
Náhlík, Luboš (UFM-A) RID, ORCID
Knésl, Zdeněk (UFM-A)Number of authors 3 Source Title International Journal of Fatigue. - : Elsevier - ISSN 0142-1123
Roč. 32, č. 8 (2010), s. 1265-1269Number of pages 4 s. Language eng - English Country GB - United Kingdom Keywords Vertex singularity ; Generalized stress intenzity factor ; Stress singularity ; Fatigue crack ; V-notch Subject RIV JL - Materials Fatigue, Friction Mechanics R&D Projects GA106/09/1954 GA ČR - Czech Science Foundation (CSF) GA101/09/0867 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z20410507 - UFM-A (2005-2011) UT WOS 000278281100005 DOI 10.1016/j.ijfatigue.2010.01.009 Annotation The effect of a free surface on fatigue crack behaviour is discussed in the paper and generalized stress intensity factor methodology is used for a reliable estimation of the fatigue crack propagation rate in the area close to a free surface, where the effect of vertex singularity is important. It is shown that a decrease in the stress singularity exponent close to the vertex point leads to a decrease in the fatigue crack propagation rate and contributes to a typical curved crack front shape. The numerical estimations of the crack shape correspond well with experimental observations taken from the literature. The proposed methodology facilitates explanation of the experimentally observed decrease in the fatigue crack propagation rate (FCPR) for thin structures. It is shown, that decrease of FCPR depends on Poisson’s ratio and parameters of the Paris–Erdogan law for corresponding materials. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2011
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