Mechanical Behaviour Of Corroded Surface Layers On Glass

The mechanical response of a glass altered layer is investigated using an indentor. The experiments are performed as a function of depth. Three main domains are evidenced according to the depth values. These domains are shown to correspond to a variation of the load as different powers of depth. Results first demonstrate a purely elastic domain followed by a regime change which exhibits a permanent deformation stress. The change in mechanical behaviour is associated to buckling and further crushing of microscopic cells. Finally, densification under load appears inducing an increase of Young's modulus.