Abstract
The effects of X-ray irradiation on the sliding and static friction of polished KC1 were studied. The sliding friction obeyed a law with both adhesive and plowing terms, and the static friction obeyed the classical law, F = μN. It was found that X-ray irradiation for 12 hours from a 40 KV, 10 mA silver target source doubled the values of the adhesive and plowing terms for sliding friction of non-annealed KCI with powdered KCI surface debris, and static friction was increased by 65%. Pre-irradiation annealing of the crystals with surface debris lowered the irradiation-induced increase in friction to 14%. Removal of surface debris prior to irradiation of annealed crystals resulted in a 20% decrease in static friction with X-ray irradiation. Explanations for the static friction results were devised by combining the ideas of Bowden and Tabor 1 with those of Archard 2. The behaviour of sliding friction with irradiation could be explained successfully by Archard's theory. The explanations are tentative only, and primarily serve to indicate the directions for further experimentation.
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