  The mechanical response of amorphous silica (or silica glass) under
hydrostatic compression for very high pressures up to 25 GPa is modelled via an
elastic-plastic constitutive equation (continuum mechanics framework).The
material parameters appearing in the theory have been estimated from the ex
situ experimental data from Rouxel et al. [Rouxel T, Ji H, Guin JP, Augereau F,
Ruffle B J Appl Phys 2010;107(9):094903]. The model is shown to capture the
major features of the pressure-volume changes response from the in situ
experimental work of Sato and Funamori [Sato T, Funamori N Phys Rev Lett
2008;101:255502]. In particular, the onset and saturation of densification, the
increase in elasticity parameters (bulk, shear and Youngs moduli) and Poissons
ratio are found to be key parameters of the model.
