Abstract
The dynamics of distribution of the triboluminescence (TL) burst intensity during the dry friction of crystalline quartz and amorphous poly(methyl methacrylate) (PMMA) plates on a rotating steel shaft have been studied. The TL bursts arise as a result of the chemical bond rupture on the banks of friction-induced cracks with linear dimensions on the order of several millimeters. For crystalline quartz, the TL burst intensity distribution displays two maxima for the signal intensities differing by a factor of ≈4. During friction, the numbers of bursts in these maxima vary in the opposite directions. For PMMA, the distribution does not exhibit clearly pronounced maxima, but it still reveals two ensembles of TL bursts with the intensities differing by a factor of ≈6, in which the numbers of bursts also varied in the opposite directions. It is concluded that the dry friction of quarts and PMMA leads to the development of two ensembles of wear cracks, the linear dimensions of which differ by a factor of 2–3.
Published Version
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