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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
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
0142-1123
869-878
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.
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), 869-878. (doi:10.1016/j.ijfatigue.2006.08.005).

Record type: Article

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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Published date: 2007
Keywords: fatigue crack growth, slip bands, grain structure, crack closure, 2xxx aluminium alloys

Identifiers

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: 09 Dec 2019 19:06

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