Effect of crack flank holes on fatigue crack growth

•Effect of holes along the crack flanks on the fatigue crack growth rate.•Numerical study using the cumulative plastic deformation at the crack tip.•Parametric study on the diameter of holes and the distance between them.•Experimental results on a CT specimen to validate the numerical model. The eff...

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Bibliographic Details
Published in:International journal of fatigue 2023-05, Vol.170, p.107505, Article 107505
Main Authors: Neto, D.M., Cavaleiro, N., Sérgio, E.R., Jesus, J., Camacho-Reyes, A., Antunes, F.V.
Format: Article
Language:English
Subjects:
Crack closure
Crack flank holes
CT specimen
Fatigue crack growth
Numerical simulation
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Summary:•Effect of holes along the crack flanks on the fatigue crack growth rate.•Numerical study using the cumulative plastic deformation at the crack tip.•Parametric study on the diameter of holes and the distance between them.•Experimental results on a CT specimen to validate the numerical model. The effect of drilling two symmetric holes along the crack flanks on the fatigue crack growth (FCG) rate was evaluated numerically. The FCG increases (decreases) when the crack tip is behind (ahead) the holes. This behaviour is enlarged both by increasing the diameter of the holes and by reducing the distance between them. This is consequence of the geometrical effect, which modifies the plastic zone size. Experimental work validated the numerical model, indicating that that cumulative plastic strain at the crack tip is an adequate crack driving force and that cyclic plastic deformation is the main damage mechanism of FCG.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2023.107505