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Ductile fracture revisited by in situ tensile test in Synchrotron X-Ray Tomography

le 9 octobre 2014
13H30

Eric Maire, Jerome Adrien, Caroline Landron, Marco Dimichiel, P Cloetens and O Bouaziz

Ductile fracture of metals has been studied extensively over the last five decades. It is composed of three steps: nucleation of cavities, growth of these nucleated cavities and coalescence leading to the final fracture. The complexity of this process has been historically studied by standard microscopy and this has permitted to validate damage models for the three different steps.
Damage in ductile materials can nowadays be imaged in 3D using different methods at different scales. The most commonly used of these recently appeared methods in the field of ductile damage is probably X-Ray Computed Tomography (XRCT) because of its multimaterial, multiscale and non destructive nature.
3D imaging (if non destructive like it is the case for XRCT) can also be coupled with in situ loading of the sample (in situ tension in the present paper). The observation of the evolution of the microstructure under load in 3D allows to understand and image separately the three steps of ductile damage as for example in the case of tension of high strength steels.
This presentation will illustrate this combination of techniques and how we have used it in recent studies in order to understand the deformation of heterogeneous materials. Very high resolution and high acquisition rates, two new tendancies in this field, will also be illustrated.
Type :
Séminaires - conférences
Lieu(x) :
Campus de Cachan
Amphi e-média
Bâtiment Léonard De Vinci de - ENS Cachan
61, avenue du Président Wilson 94230 Cachan
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