Influence of grain structure and slip planarity on fatigue crack growth in low alloying artificially aged 2xxx aluminium alloys
Influence of grain structure and slip planarity on fatigue crack growth in low alloying artificially aged 2xxx aluminium alloys
The fatigue crack growth behaviour under constant amplitude loading of three low alloying artificially aged 2xxx aluminium alloys with distinct microstructures is analysed. Fatigue crack growth tests show a correlation between fatigue performance and the occurrence of crack closure. Fractography and fracture surface measurements show that rougher surfaces give higher closure levels suggesting a dominating influence of RICC in these alloys. The relationship between the crack path and the microstructure, i.e. grain structure and slip planarity, is assessed semi-quantitatively. A criterion to evaluate the propensity for slip band formation is derived and reasonable correlation is found between the fatigue fracture behaviour of the three alloys and this criterion.
fatigue crack growth, slip bands, grain structure, crack closure, 2xxx aluminium alloys
869-878
Kamp, N.
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Gao, N.
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Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Sinclair, I.
6005f6c1-f478-434e-a52d-d310c18ade0d
2007
Kamp, N.
ba7fdd8e-3e59-4c94-9cf5-944eda3e1050
Gao, N.
9c1370f7-f4a9-4109-8a3a-4089b3baec21
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Sinclair, I.
6005f6c1-f478-434e-a52d-d310c18ade0d
Kamp, N., Gao, N., Starink, M.J. and Sinclair, I.
(2007)
Influence of grain structure and slip planarity on fatigue crack growth in low alloying artificially aged 2xxx aluminium alloys.
International Journal of Fatigue, 29 (5), .
(doi:10.1016/j.ijfatigue.2006.08.005).
Abstract
The fatigue crack growth behaviour under constant amplitude loading of three low alloying artificially aged 2xxx aluminium alloys with distinct microstructures is analysed. Fatigue crack growth tests show a correlation between fatigue performance and the occurrence of crack closure. Fractography and fracture surface measurements show that rougher surfaces give higher closure levels suggesting a dominating influence of RICC in these alloys. The relationship between the crack path and the microstructure, i.e. grain structure and slip planarity, is assessed semi-quantitatively. A criterion to evaluate the propensity for slip band formation is derived and reasonable correlation is found between the fatigue fracture behaviour of the three alloys and this criterion.
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N.Kamp-Int_Jnl_Fatigue-paper1-together.pdf
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Published date: 2007
Keywords:
fatigue crack growth, slip bands, grain structure, crack closure, 2xxx aluminium alloys
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Local EPrints ID: 43986
URI: http://eprints.soton.ac.uk/id/eprint/43986
ISSN: 0142-1123
PURE UUID: c7cbfcba-42f2-4348-82e4-124d8e187896
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Date deposited: 06 Feb 2007
Last modified: 16 Mar 2024 03:21
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Author:
N. Kamp
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