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Brittle fracture down to femto-Joules - and below
J. Astrom1, P. Di Stefano2, F. Proebst3, L. Stodolsky3, J. Timonen4

We analyze large sets of energy-release data created by stress-induced brittle fracture in a pure sapphire crystal at close to zero temperature where stochastic fluctuations are minimal. The waiting-time distribution follows that observed for fracture in rock and for earthquakes. Despite strong time correlations of the events and the presence of large-event precursors, simple prediction algorithms only succeed in a very weak probabilistic sense. We also discuss prospects for further cryogenic experiments reaching close to single-bond sensitivity and able to investigate the existence of a transition-stress regime.
1 :  CSC-IT ESBO - CSC-IT Esbo
2 :  IPNL - Institut de Physique Nucléaire de Lyon
3 :  MPI-P - Max-Planck-Institut für Physik
4 :  University of Jyväskylä
Physique/Matière Condensée/Science des matériaux
cryogénie – fractures – séismes
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