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Fatigue crack shape prediction based on the stress singularity exponent
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SYSNO ASEP 0385372 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Fatigue crack shape prediction based on the stress singularity exponent Author(s) Hutař, Pavel (UFM-A) RID, ORCID
Ševčík, Martin (UFM-A) RID
Náhlík, Luboš (UFM-A) RID, ORCID
Knésl, Zdeněk (UFM-A)Number of authors 4 Source Title Key Engineering Materials - ISSN 1013-9826
488-489, č. 1 (2012), s. 178-181Number of pages 4 s. Action International Conference on Fracture and Damage Mechanics - FDM 2011 /10./ Event date 19.09.2011-21.09.2011 VEvent location Dubrovník Country HR - Croatia Event type EUR Language eng - English Country CH - Switzerland Keywords stress singularity exponent ; crack front curvature ; vertex singularity ; free surface effect Subject RIV JL - Materials Fatigue, Friction Mechanics R&D Projects GA101/09/0867 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z2041904 - UFM-A UT WOS 000306531200044 DOI 10.4028/www.scientific.net/KEM.488-489.178 Annotation In many industrial applications it is necessary to predict fatigue lifetime of the structures where the stress field near the crack front have a three-dimensional nature. Due to the existence of vertex singularity in the point where the crack front touches free surface, crack propagation in 3D structures cannot be reduced to a series of plane strain or plane stress problems along the crack front. The paper describes the influence of the vertex singularity on crack shape for threedimensional structure. The iterative process for estimation of a real crack front based on a stress singularity exponent is presented. In each node defining the crack front the stress singularity exponent has been estimated and complete crack front shape corresponding to the constant stress singularity exponent was found. The methodology presented can help to estimate crack front shape in a linear elastic fracture mechanics framework and estimate fracture parameters of fatigue cracks more accurately. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2013
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