Original title: The influence of vertex singularities on fatigue crack shape
Translated title: Vliv rohové singularity na tvar únavové trhliny
Authors: Hutař, Pavel ; Náhlík, Luboš ; Knésl, Zdeněk ; Seitl, Stanislav
Document type: Papers
Conference/Event: ECF17 - European Conference on Fracture /17./, Brno (CZ), 2008-09-02 / 2008-09-05
Year: 2008
Language: eng
Abstract: [eng] [cze]
Due to the existence of vertex singularity at the point where the crack intersects the free surface, stress distribution around the crack tip and the type of the singularity is changed. In the interior of the specimen the classical singular behaviour of the crack is dominant and can be described using generally known analytic equations. Contrary to this, at the free surface or in the boundary layer close to the free surface the vertex singularity is significant. The influence of vertex singularity on crack behaviour and crack shape for a three-dimensional structure is described in this paper. To estimate the influence of the free surface on fatigue crack growth rate the model of a general singular stress concentrator was applied. The estimated fatigue crack shape can help to provide a more reliable estimation of the fatigue life of the structures considered. Diky existenci rohové singularity v místě, kde se protíná čelo trhliny s volným povrchem, rozdělení napětí a typ singularity se mění. Tato změna se dá postihnout pomocí zobecněné lomové mechaniky a popsat tak změny rychlosti šíření únavové trhliny pomocí zobecněného faktoru intenzity napětí. Pomocí tohoto konceptu lze odhadnout i výsledný tvar únavové trhliny. Tato metodologie poskytuje nástroj k zpřesnění odhadu únavové životnosti pro složité trojdimensionální objekty.
Keywords: fatigue crack; generalized stress intensity factor; vertex singularity
Project no.: CEZ:AV0Z20410507 (CEP), KJB200410803 (CEP), GP106/06/P239 (CEP)
Funding provider: GA AV ČR, GA ČR
Host item entry: Proceedings of 17th European Conference on Fracture, ISBN 978-80-214-3692-3

Institution: Institute of Physics of Materials AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0168295

Permalink: http://www.nusl.cz/ntk/nusl-39723


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Research > Institutes ASCR > Institute of Physics of Materials
Conference materials > Papers