This article is cited in 7 papers

Mechanical properties, strength physics and plasticity

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

V. I. Vettegren^a, A. V. Ponomarev^b, I. P. Shcherbakov^a, R. I. Mamalimov<sup>a

a</sup> Ioffe Institute, St. Petersburg
^b Institute of Physics of the Earth, Russian Academy of Scienses, Moscow, Russia

Abstract: On friction of a heterogeneous material: sandstone, flashes of triboluminescence are observed. Triboluminescence arises on the relaxation of excitation of free radicals $\equiv$ 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 $\sim$0.4 to $\sim$7 $\mu$m. The microcrack formation on friction leads to the spalling of feldspar and quartz microcrystals from a sample.

Received: 25.01.2017

DOI: 10.21883/FTT.2017.08.44758.18

 English version: Physics of the Solid State, 2017, 59:8, 1580–1583

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