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Elasto-plastic strain field measurement at micro-scale on 316L stainless steel

Communication avec acte
Auteur
MOULART, Raphaël
211915 Mechanics surfaces and materials processing [MSMP]
ROTINAT, René
211915 Mechanics surfaces and materials processing [MSMP]

URI
http://hdl.handle.net/10985/12940
Date
2013

Résumé

This study deals with the characterisation of the mechanical behaviour of an austenitic stainless steel (316L) at the micrometric scale in its elasto-plastic domain. For that, the full-field “grid method”, adapted to this scale, is implemented. The direct interferometric photolithography is used here to produce gratings (the pitch is approximately 5 μm) on specimen surface. The gratings are digitized at every step of the tensile loading thanks to a white-light interferometric microscope. The in-plan strain fields are then deduced from these grating images (resolution is closed to 2×10-3 for a spatial resolution of bout 20 μm). The results show that the strain localisation is in accordance with the microstructure. Some considerations about the average strain within different grains of the steel sample are made to show how the plastic deformation begins locally before the global yield point σY. It was then observed that these local σY values thus determined may vary by +/-20 MPa around the macroscopic value (180 MPa).

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  • Laboratoire Mechanics, Surfaces and Materials Processing (MSMP)

Documents liés

Visualiser des documents liés par titre, auteur, créateur et sujet.

  • On the use of a penalized least squares method to process kinematic full-field measurements 
    Article dans une revue avec comité de lecture
    MOULART, Raphaël; ROTINAT, René (IOP Publishing, 2014)
    This work is aimed at exploring the performances of an alternative procedure to smooth and differentiate full-field displacement measurements. After recalling the strategies currently used by the experimental mechanics ...
  • On the realization of microscopic grids for local strain measurement by direct interferometric photolithography 
    Article dans une revue avec comité de lecture
    MOULART, Raphaël; ROTINAT, René; PIERRON, Fabrice; LERONDEL, Gilles (Elsevier, 2007)
    In order to extend the application range of the so-called ‘‘grid method’’ to the micron cale and thus quantitatively characterize the micromechanical behavior of metallic alloys, we report in this paper on the optimization ...
  • Experimental identification of the overall elastic rigidities of superconducting windings 
    Article dans une revue avec comité de lecture
    ROTINAT, René; MOULART, Raphaël; NUNIO, François; VEDRINE, Pierre (IOS Press, 2016)
    This study deals with an experimental methodology developed in order to identify the elastic properties of superconducting ring-shaped windings, constituents of the main coil winding of a magnetic resonance imaging magnet ...
  • Full-field evaluation of the onset of microplasticity in a steel specimen 
    Article dans une revue avec comité de lecture
    MOULART, Raphaël; ROTINAT, René; PIERRON, Fabrice (Elsevier, 2009)
    This work deals with the study of the local onset of microplasticity in a steel specimen under tensile test through the use of a full-field strain measurement method at the micrometric scale. The kinematic measurements ...
  • Micro-scale full-field strain measurement on a stainless steel sample elasto-plastically tested 
    Communication avec acte
    MOULART, Raphaël; ROTINAT, René (2013)
    This study deals with the characterisation of the mechanical behaviour of an austenitic stainless steel at the micrometric scale in its elasto-plastic domain. For that, the full-field “grid method”, adapted to this scale, ...

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