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| Naji, M. |
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Bartali, Ahmed El
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Publications (7/7 displayed)
- 2023Characterisation of 3D strain heterogeneity at the microstructure scale during Low Cycle Fatigue of an AlSi7Cu3Mg alloy at 250°Ccitations
- 2021Coupling of X‐ray computed tomography and surface in situ analysis combined with digital image correlation method to study low cycle fatigue damage micromechanisms in lost foam casting A319 alloycitations
- 2020Damage mechanisms in an aluminium-silicon alloy with a controlled defect
- 2015Study of damage mechanisms in A319 aluminium alloy by X-ray tomography and Digital Volume Correlation
- 2014Influence of the Lost Foam Casting Microstructure on Low Cycle Fatigue Damage of A319 Aluminum Alloy
- 2014Influence of the Casting Microstructure upon the Tensile Behaviour in A319 Al‐Si Alloy Investigated by X‐Ray Tomography and Digital Volume Correlationcitations
- 2013Microstructural strain heterogeneities during low cycle fatigue
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document
Study of damage mechanisms in A319 aluminium alloy by X-ray tomography and Digital Volume Correlation
Abstract
In the cylinder heads produced by the Lost Foam Casting process, the microstructure consists of hard intermetallic phases and large gas and microshrinkage pores. In order to study the influence of this complex 3D microstructure on fatigue crack initiation and propagation, an experimental protocol using laboratory and synchrotron tomography, Finite Element simulation and 3D Digital Volume Correlation has been used. Tests performed at low temperatures (room temperature and 150°C) revealed the initiation of 3D cracks at large pores and a propagation along the hard inclusions towards the free surface. At temperatures characteristics of in-service conditions (above 200°C), an additional damage mechanism was observed: cracks were detected in silicon particles around the main pore that drove to failure but also in other areas of the specimen gauge length.