Effect of the free surface on the fatigue crack front curvature at high stress asymmetry

0494603 - ÚFM 2020 RIV GB eng J - Journal Article
Oplt, Tomáš - Hutař, Pavel - Pokorný, Pavel - Náhlík, Luboš - Chlup, Zdeněk - Berto, F.
Effect of the free surface on the fatigue crack front curvature at high stress asymmetry.
International Journal of Fatigue. Roč. 118, JAN (2019), s. 249-261. ISSN 0142-1123. E-ISSN 1879-3452
R&D Projects: GA ČR(CZ) GA18-03615S; GA MŠMT(CZ) EF16_013/0001823
Institutional support: RVO:68081723
Keywords : Vertex singularity * Stress intensity factor * Free surface * Fatigue crack front * Finite elements
OECD category: Materials engineering
Impact factor: 4.369, year: 2019
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/pii/S0142112318304080?via%3Dihub

The purpose of this paper is to investigate the effect of the vertex singularity on the fatigue crack front behaviour.
Single edge notch bend specimens of steel EA4T and aluminium alloy 7075 of various thicknesses are
subjected to the cyclic loading and the angles of the fatigue crack front curvature was measured. The experimental
procedure is simulated using finite element analysis. Two methodologies used for the fatigue crack front
shape estimation are compared. One is using stress singularity exponent as a controlling parameter and the
second one is using stress intensity factor. Both methodologies provide comparable results of crack front formation
process and they are in very good agreement with experimental results.
Permanent Link: http://hdl.handle.net/11104/0295890