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Numerical estimation of the fatigue crack front shape for a specimen with finite thickness
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SYSNO ASEP 0385371 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Numerical estimation of the fatigue crack front shape for a specimen with finite thickness Author(s) Ševčík, Martin (UFM-A) RID
Hutař, Pavel (UFM-A) RID, ORCID
Zouhar, Michal (UFM-A)
Náhlík, Luboš (UFM-A) RID, ORCIDNumber of authors 4 Source Title International Journal of Fatigue. - : Elsevier - ISSN 0142-1123
Roč. 39, č. 1 (2012), s. 75-80Number of pages 6 s. Language eng - English Country GB - United Kingdom Keywords Crack front shape ; Vertex singularity ; Fatigue crack ; Stress singularity exponent Subject RIV JL - Materials Fatigue, Friction Mechanics R&D Projects GA101/09/0867 GA ČR - Czech Science Foundation (CSF) GA106/09/1954 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z2041904 - UFM-A UT WOS 000301684400012 DOI 10.1016/j.ijfatigue.2011.03.010 Annotation An iterative process for the estimation of a fatigue crack front based on linear elastic fracture mechanics using values of the stress singularity exponent is presented. Based on the assumption of a constant stress singularity exponent along the crack front, a numerical approach leading to crack shape determination is suggested and applied. The crack front was approximated by a spline curve. In each node defining the crack front the stress singularity exponent was estimated and a complete crack front shape was found. The difference between thin and thick specimens is then described and discussed. The approach presented leads to better estimation of the crack front shape for structures with different thicknesses and a more accurate determination of fatigue crack fracture parameters. The results presented can be helpful for a better understanding of fatigue failure and more reliable prediction of residual lifetime. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2013
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