Elasto-plastic strain field measurement at micro-scale on 316L stainless steel
TypeCommunications avec actes
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).
Cette publication figure dans le(s) laboratoire(s) suivant(s)
Visualiser des documents liés par titre, auteur, créateur et sujet.
ROTINAT, René; MOULART, Raphaël; NUNIO, François; VEDRINE, Pierre (ISEM 2015, 2015)This study deals with of the experimental methodology developed in order to identify the elastic properties of superconducting ring-shaped windings. Mechanical tensile tests were conducted on specimens associated to a ...
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 ...
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 ...
MOULART, Raphaël; ROTINAT, René; NUNIO, François; VEDRINE, Pierre (2015)Cette étude propose une méthodologie expérimentale afin d’identifier les propriétés mécanique élastiques d’anneaux supraconducteurs. Des essais de traction diamétrale associés à une technique de mesure champs de déplacements ...
MOULART, Raphaël; ROTINAT, René (SEM 2015, 2015)This work proposes an alternative procedure to smooth and differentiate experimental full-field displacement measurements to get strain fields. This one, the penalized least squares method, relies on the balance between ...