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Three-dimensional characterisation and modelling of small fatigue corner cracks in high strength Al-alloys

Three-dimensional characterisation and modelling of small fatigue corner cracks in high strength Al-alloys
Three-dimensional characterisation and modelling of small fatigue corner cracks in high strength Al-alloys
The growth of fatigue cracks at small length scales is known to be influenced by a variety of factors, including local microstructure, varying stress states and crack shape. High resolution computed tomography allows for sub-micron resolution imaging of failure processes in small test coupons undergoing in situ cyclic loading, providing detailed three-dimensional (3D) assessment of propagation processes across the entire crack front (surface and depth). In this work fatigue crack growth has been examined in an advanced Direct Chill (DC) cast aluminium alloy, along with a fine grained powder-metallurgy alloy. The latter is identified as a model material, offering considerably simpler microscopic crack paths than the DC cast alloy, and hence a means of separating bulk mechanical effects (such as stress state variations across a crack front and plasticity induced closure) from microstructural effects (such as crystallographic deflection and roughness induced crack closure). Crack growth has been studied in both materials under both constant amplitude (CA) and single peak overload (OL) conditions. Experimental results are presented in the present paper, particularly in relation to micromechanical understanding of failure. A modelling approach based on those results, and some typical results, is also presented.
fatigue, computed tomography, synchrotron radiation, crack closure, aluminium alloys
1631-0705
316-327
Proudhon, Henry
6cbf8c5d-ce6b-428c-9f0e-05c44abf9f6e
Moffat, A.
fca3bcf0-9c15-4309-9a50-6f8c7aebc2dd
Sinclair, Ian
6005f6c1-f478-434e-a52d-d310c18ade0d
Buffiere, Jean-Yves
33738872-9084-48d0-aa87-7d05f9b04f32
Proudhon, Henry
6cbf8c5d-ce6b-428c-9f0e-05c44abf9f6e
Moffat, A.
fca3bcf0-9c15-4309-9a50-6f8c7aebc2dd
Sinclair, Ian
6005f6c1-f478-434e-a52d-d310c18ade0d
Buffiere, Jean-Yves
33738872-9084-48d0-aa87-7d05f9b04f32

Proudhon, Henry, Moffat, A., Sinclair, Ian and Buffiere, Jean-Yves (2012) Three-dimensional characterisation and modelling of small fatigue corner cracks in high strength Al-alloys. [in special issue: Use of large scale facilities for research in metallurgy] Comptes Rendus Physique, 13 (3), 316-327. (doi:10.1016/j.crhy.2011.12.005).

Record type: Article

Abstract

The growth of fatigue cracks at small length scales is known to be influenced by a variety of factors, including local microstructure, varying stress states and crack shape. High resolution computed tomography allows for sub-micron resolution imaging of failure processes in small test coupons undergoing in situ cyclic loading, providing detailed three-dimensional (3D) assessment of propagation processes across the entire crack front (surface and depth). In this work fatigue crack growth has been examined in an advanced Direct Chill (DC) cast aluminium alloy, along with a fine grained powder-metallurgy alloy. The latter is identified as a model material, offering considerably simpler microscopic crack paths than the DC cast alloy, and hence a means of separating bulk mechanical effects (such as stress state variations across a crack front and plasticity induced closure) from microstructural effects (such as crystallographic deflection and roughness induced crack closure). Crack growth has been studied in both materials under both constant amplitude (CA) and single peak overload (OL) conditions. Experimental results are presented in the present paper, particularly in relation to micromechanical understanding of failure. A modelling approach based on those results, and some typical results, is also presented.

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More information

Published date: April 2012
Keywords: fatigue, computed tomography, synchrotron radiation, crack closure, aluminium alloys
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 337995
URI: http://eprints.soton.ac.uk/id/eprint/337995
ISSN: 1631-0705
PURE UUID: 57e51a19-f174-4325-9e91-f133ad761d91

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Date deposited: 09 May 2012 13:11
Last modified: 14 Mar 2024 11:01

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Contributors

Author: Henry Proudhon
Author: A. Moffat
Author: Ian Sinclair
Author: Jean-Yves Buffiere

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