The influence of the structure of a nanocrystalline solid (sandstone) on the dynamics of microcrack accumulation on friction

V. I. Vettegren’; A. V. Ponomarev; I. P. Shcherbakov; R. I. Mamalimov

doi:10.1134/S1063783417080315

The influence of the structure of a nanocrystalline solid (sandstone) on the dynamics of microcrack accumulation on friction

Авторы: Vettegren’ V.I.¹, Ponomarev A.V.², Shcherbakov I.P.¹, Mamalimov R.I.¹
Учреждения:
1. Ioffe Institute
2. Schmidt Institute of Physics of the Earth
Выпуск: Том 59, № 8 (2017)
Страницы: 1580-1583
Раздел: Mechanical Properties, Physics of Strength, and Plasticity
URL: https://ogarev-online.ru/1063-7834/article/view/200718
DOI: https://doi.org/10.1134/S1063783417080315
ID: 200718

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Аннотация

On friction of a heterogeneous material: sandstone, flashes of triboluminescence are observed. Triboluminescence arises on the relaxation of excitation of free radicals ≡Si–O^–. These radicals form on disruptions of Si–O–Si bonds and are located at microcrack edges. Microcracks form at the boundaries of feldspar and quartz microcrystals. Their sizes range from ~0.4 to ~7 μm. The microcrack formation on friction leads to the spalling of feldspar and quartz microcrystals from a sample.