13th International Conference on Fracture June 16–21, 2013, Beijing, China -6- Figure 8. Fracture surface of quartz. Optical microscopy. 3. Conclusions In our experiments we found that exist: • Power law distribution of fragment size; • Power law distribution of time interval between the impulses of the light reflected from newly created surfaces. So we can suppose that self-organized criticality is the underlying mechanism of fragmentation except initial stage where exponential distribution is observed. We suppose that the initial stage corresponds to the breaking of bulk specimen and formation of a granular media. The main stage at which most of the fragments was created corresponds to the fragmentation of the granular media formed at the first stage. Acknowledgements The author would like to acknowledge the Russian Foundation for Basic Research (grant RFBR 11-01-96010, grant RFBR 11-01-00712) and Russian Academy of Sciences (program #12-II-1-1021, #12-C-1-1013). References [1] М.М. Davydova, О.B. Naimark, V.A.Leontiev and S.V. Uvarov. Scaling properties of crack branching and brittle fragmentation. European Physical Journal Web of Conferences: 10, 00037p.1-00037p.4, 2010. [2] P. Bak, C. Tang and K. Wiesenfeld, Self-organized criticality: an explanation of 1/f noise. Phys. Rev. Letters 59: 381-384, 1987. [3] V. I. Vettegren’, V. S. Kuksenko and I. P. Shcherbakov. Emission kinetics of light, sound, and radio waves from single-crystalline quartz after impact on its surface. Technical Physics. V 56, N 4 (2011), 577-580, DOI: 10.1134/S1063784211040311
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