Abstract
The dynamics of fractoluminescence flashes and the time dependences of surface deformation of granite with different sizes of feldspar grains under an impact on samples by a metal pin have been studied with a 10 ns resolution. A band at ∼1.9 eV has been observed in the fractoluminescence spectra, which means that, under the influence of mechanical stresses, Si-O-Si bonds are broken and ≡ SiO⊙ free radicals are formed. The fractoluminescence has the form of flashes with a duration of ∼10 ns. It has been assumed that each of them corresponds to the nucleation of a microcrack. From the flash intensities and the elastic wave velocity, the linear size of microcracks has been estimated to be from ∼8 to 30 μm. Microcracks are mainly generated during passage of a deformation wave through feldspar grains. An impact causes the appearance of eigenvibrations of the entire sample, and cracking of grains gives rise to eigenvibrations of grains.
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Original Russian Text © V.I. Vettegren, V.S. Kuksenko, I.P. Shcherbakov, 2012, published in Fizika Tverdogo Tela, 2012, Vol. 54, No. 7, pp. 1342–1346.
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Vettegren, V.I., Kuksenko, V.S. & Shcherbakov, I.P. Dynamics of microcracks and time dependences of surface deformation of a heterogeneous body (granite) under an impact. Phys. Solid State 54, 1425–1429 (2012). https://doi.org/10.1134/S1063783412070347
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DOI: https://doi.org/10.1134/S1063783412070347