Raman microspectroscopic characterization of amorphous silica plastic   behavior
  Raman microspectroscopy was used to characterize amorphous silica plastic behavior. Using a correlation between Raman spectrum and density, a map of the local residual indentation-induced densification is obtained. The existence of a densification-induced hardening is also evidenced through a diamond anvil cell experiment. Such observations are not accounted for by the previously proposed hardening-free pressure-dependent yield criterion based on indentation curves. These results open the way to more accurate description of a constitutive law for amorphous silica. 
Antoine Perriot (SVI), Val\'erie Martinez (LPCML), Laurent Grosvalet   (LPCML), Christine Martinet (LPCML), Bernard Champagn...