Plasticity at nanoindentation site in glass : a possible experimental benchmark for numerical modeling
Résumé
We have recently developed a technique allowing for the 3 dimensional probing, with a nanometer scale resolution, of small volumes affected by plastic events at Nano indentation sites. This method is sensitive to the structural changes in the glassy network (number of SiO4 units per ring, Si-O-Si inter-tetrahedral angle, connectivity loss) resulting from the densification. The plastic zone due to structural modifications has an enhanced reaction rate which, if coupled with precise atomic force microscopy measurements (AFM), may be used for probing and rebuilt the densified volume beneath nano indentation or nano scratch imprints made on a glass surface. Instrumented nano indentations and scratches (250 µN to 10 mN range) were made on various glass compositions. The effect of the applied load on the size and the shape of the plastic zone size is reported and compared to numerical simulations.
Domaines
Mécanique [physics]Origine | Fichiers éditeurs autorisés sur une archive ouverte |
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