Estimation of critical applied stress for crack initiation from a sharp V-notch

0498117 - ÚFM 2019 RIV NL eng J - Journal Article
Náhlík, Luboš - Štegnerová, Kateřina - Hutař, Pavel
Estimation of critical applied stress for crack initiation from a sharp V-notch.
Theoretical and Applied Fracture Mechanics. Roč. 93, FEB (2018), s. 247-262. ISSN 0167-8442. E-ISSN 1872-7638
R&D Projects: GA ČR GA15-09347S; GA MŠMT LM2015069; GA MŠMT(CZ) LQ1601
Institutional support: RVO:68081723
Keywords : generalized linear elastic fracture mechanics * V-notch * Generalized stress intensity factor * Mean stress criterion * Critical stress
OECD category: Applied mechanics
Impact factor: 2.848, year: 2018

The aim of this paper is to estimate the critical applied stress value for a crack initiated from a sharp V-notch tip. The classical approach of 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 to determine the stress distribution near the sharp V-notch tip and for estimating the generalized stress intensity factor depending on the V-notch opening angle. The critical value of the generalized stress intensity factor was obtained using stability criteria based on the tangential stress component averaged over a critical distance from the V-notch tip and the generalized strain energy density factor. These criteria were applied in the case of corner stress singularity, as well. The calculated values of the critical applied stresses were compared with the experimental data from the literature, and the applicability of the LEFM concept is discussed.
Permanent Link: http://hdl.handle.net/11104/0290599