Study of damage mechanisms in A319 aluminium alloy by X-ray tomography and Digital Volume Correlation

type de publication      communication internationale avec actes publiés
date de publication 2015
auteur(s) Dahdah Nora; Limodin Nathalie; El Bartali Ahmed; Witz Jean-François; Seghir Rian; Charkaluk Eric; Buffière Jean-Yves
  
conférence Photomechanics 2015
     dates de 27-05-2015 à 29-05-2015
     lieu Delft, Netherlands
     nom des actes Photomechanics 2015
  
résumé 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.
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