Mapping of the plastic zone under nanoindentation imprints : toward a better ductile to brittle transition insight in oxide glasses - Université de Rennes Accéder directement au contenu
Communication Dans Un Congrès Année : 2019

Mapping of the plastic zone under nanoindentation imprints : toward a better ductile to brittle transition insight in oxide glasses

Gwenole Trenvouez
Kun Han
  • Fonction : Auteur
Mariette Nivard
Vincent Keryvin
  • Fonction : Auteur
  • PersonId : 950695
Cédric Bernard
Jean-Pierre Guin

Résumé

In order to study the regime of nanoindentation for which plasticity (shear flow and densification) is the only responsible for the creation of the residual imprint (i.e. no crack).We have developed a technique allowing for the 3-dimensional probing of the plastic zone, with a nanometer scale resolution underneath nanoindentation imprints. Nonetheless this regime is quite difficult to study experimentally as it requires the application of ultra-low indentation loads (below 50 mN) in order to minimize as much as possible the occurrence of cracks. This leads to a plastic zone size of the order of tens to hundreds of nanometers, which makes conventional methods such as Micro Raman or Brillouin Spectroscopies inappropriate to study this zone. The experimental approach is nonetheless necessary for the validation of the constitutive law implemented in numerical simulations.This method based on AFM and image 3D image treatment is sensitive to the structural modifications in the glassy network resulting from the densification and allows for the 3-dimensional reconstruction of the plastic domain. We will present the robustness of the developed method as well as experimental results such as the effect of load, loading rate. This method is also very promising for studying the first steps of crack nucleation under sharp contact.
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Dates et versions

hal-02157074 , version 1 (15-06-2019)

Identifiants

  • HAL Id : hal-02157074 , version 1

Citer

Gwenole Trenvouez, Kun Han, Mariette Nivard, Vincent Keryvin, Cédric Bernard, et al.. Mapping of the plastic zone under nanoindentation imprints : toward a better ductile to brittle transition insight in oxide glasses. 25th International Congress on Glass (ICG 2019), Jun 2019, Boston, United States. ⟨hal-02157074⟩
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