Critical applied stresses for a crack initiation from a sharp V-notch

0434767 - ÚFM 2015 RIV IT eng C - Conference Paper (international conference)
Náhlík, Luboš - Hutař, Pavel - Štegnerová, Kateřina
Critical applied stresses for a crack initiation from a sharp V-notch.
Frattura ed Integrita Strutturale. Vol. 8. Catania: Gruppo Italiano Frattura, 2014, s. 55-61. 30. ISBN 978-88-95940-49-6. ISSN 1971-8993.
[Fracture and Structural Integrity related Issues. Catania (IT), 15.09.2014-17.09.2014]
R&D Projects: GA MŠMT(CZ) EE2.3.30.0063; GA MŠMT(CZ) EE2.3.20.0214
Institutional support: RVO:68081723
Keywords : Crack initiation * V-notch * critical stress * strain energy density factor * generalized linear elastic fracture mechanics * fracture criteria
Subject RIV: JL - Materials Fatigue, Friction Mechanics

The aim of the paper is to estimate a value of the critical applied stress for a crack initiation from a sharp V-notch tip. The classical approach of the linear elastic fracture mechanics (LELM) was generalized, because the stress singularity exponent differs from 0.5 in the studied case. The value of the stress singularity exponent depends on the V-notch opening angle. The finite element method was used for a determination of stress distribution in the vicinity of the sharp V-notch tip and for the estimation of the generalized stress intensity factor depending on the V-notch opening angle. Critical value of the generalized stress intensity factor was obtained using stability criteria based on the opening stress component averaged over a critical distance d from the V-notch tip and generalized strain energy density factor. Calculated values of the critical applied stresses were compared with experimental data from the literature and applicability of the LEFM concept is discussed.
Permanent Link: http://hdl.handle.net/11104/0238868