Fractoluminescence characterization of the energy dissipated during fast   fracture of glass
  Fractoluminescence experiments are performed on two kinds of silicate glasses. All the light spectra collected during dynamic fracture reveal a black body radiator behaviour, which is interpreted as a crack velocity-dependent temperature rise close to the crack tip. Crack velocities are estimated to be of the order of 1300 m.s$^{-1}$ and fracture process zones are shown to extend over a few nanometers. 
Gael Pallares and Cindy L. Rountree and Ludovic Douillard and Fabrice   Charra and Elisabeth Bouchaud
cond-mat.mtrl-sci