Fracture of silicate glasses: ductile or brittle?
Atomic force microscopy is used to investigate the possibility of cavity formation during crack growth in silicate glasses. Matching areas on both fracture surfaces were mapped and then compared. For silica glass, and soda-lime-silicate glass, the fracture surfaces matched to a resolution of better than 0.3 nm normal to the surface and 5 nm parallel to the surface. We could find no evidence for cavity formation in our study and suggest that completely brittle fracture occurs in glass.
Guin
Jean-Pierre
JP
National Institute of Standards and Technology, Gaithersburg, Maryland 20814, USA.
Wiederhorn
Sheldon M
SM