2026-06-01T01:57:20Zhttps://riuma.uma.es/rest/oai/requestoai:riuma.uma.es:10630/239442026-02-03T10:54:11Zcom_10630_2254col_10630_37953
RIUMA. Repositorio Institucional de la Universidad de Málaga
author
Borges, Micael Frias
author
López-Crespo, Pablo
author
Antunes, Fernando Ventura
author
Moreno-Morales, María Belén
author
Prates, P. A.
author
Camas-Peña, Daniel
author
Neto, Diogo Mariano
2022-04-19T11:53:50Z
2022-04-19T11:53:50Z
2021-12
Borges, Micael Frias, Lopez-Crespo, Pablo, Antunes, Fernando Ventura, Moreno-Morales, Maria Belen, Prates, P. A., Camas, Daniel, Neto, Diogo Mariano. Fatigue crack propagation analysis in 2024-T351 aluminium alloy using nonlinear parameters. International Journal of Fatigue Volume 153, December 2021, 106478. https://doi.org/10.1016/j.ijfatigue.2021.106478
https://hdl.handle.net/10630/23944
10.1016/j.ijfatigue.2021.106478
In this work, fatigue crack growth (FCG) in the 2024-T351 aluminium alloy is studied using the plastic CTOD range, Δδp. Experimental tests were performed on 12 mm thick CT specimens in order to obtain FCG rate and in cylindrical specimens to obtain stress–strain loops. A numerical analysis replicated the experimental work in terms of material, geometry and loading conditions, but assuming pure plane strain state, in order to obtain Δδp. The material parameters were fitted using the experimental stress–strain loops. The experimental work showed an increase of FCG rate with the increase of stress ratio from R = 0.1 to R = 0.7 mm, which indicated the existence of the crack closure phenomenon. However, the analysis of the position of the first node behind the crack tip showed that there is no crack closure under plane strain state, while a maximum value of 36% was found for plane stress state. Therefore, the surfaces influence FCG rate even in 12 mm thick specimens. A nearly linear relation was found between da/dN and Δδp. The comparison with other aluminium alloys showed that there is a significant influence of material on da/dN-Δδp relation. The change from plane strain to plane stress state decreased FCG rate due to crack closure. Under plane strain state there is a minor influence of stress ratio in the range R = 0.1–0.7, also because there is no crack closure. Finally, a comparison was made between plastic CTOD and cumulative plastic strain at the crack tip. Well defined relations were found, showing that both parameters can be used to quantify crack tip deformation.
eng
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Aluminio - Fatiga
Fatigue crack propagation analysis in 2024-T351 aluminium alloy using nonlinear parameters
journal article
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