Numerical determination of the crack front shape for a specimen with finite thickness

0353464 - ÚFM 2011 RIV PL eng C - Konferenční příspěvek (zahraniční konf.)
Ševčík, Martin - Hutař, Pavel - Zouhar, Michal - Náhlík, Luboš
Numerical determination of the crack front shape for a specimen with finite thickness.
XV International Colloquim Mechanical Fatigue of Metals. Opole: Opole University of Technology, 2010 - (Rozumek, D.; Macha, E.), s. 1-6. ISBN 978-83-60691-83-0.
[International Colloquim Mechanical Fatigue of Metals /15./. Opole (PL), 13.09.2010-15.09.2010]
Grant CEP: GA ČR GA106/09/1954; GA ČR GA101/09/0867
Výzkumný záměr: CEZ:AV0Z20410507
Klíčová slova: stress singularity exponent * free surface effect * crack front
Kód oboru RIV: JL - Únava materiálu a lomová mechanika

The iterative process for estimation of a real crack front based on a stress singularity exponent is presented. The crack front was approximated by a spline curve. In each node defining the crack front the stress singularity exponent has been estimated and complete crack front shape was found. The difference between thin and thick specimens is described and discussed. The methodology presented can help to estimate crack front shape in a linear elastic fracture mechanics framework and estimate fracture parameters of cracks more accurately. Therefore, the results presented can be helpful for a better understanding of fatigue failure and more reliable prediction of their residual lifetime.
Trvalý link: http://hdl.handle.net/11104/0192709