2020 年 93 巻 11 号 p. 358-365
When a rigid slider moves over a surface of cross-linked rubber, two kinds of vibration are generated, one being a stick-slip motion, the second being vibrations with a much higher frequency. The high frequency vibration corresponds to the natural resonance frequency of rubber induced during the slip stage of the stick-slip motion, which initiates microcracks on the surface of the rubber. The violent stick-slip motion of the rubber might occur with the same mechanism as observed in atomic motions of metal, in which a large potential energy difference generated between the adjacent atoms when an atom moves on others arranged regularly produces the discontinuous energy dissipation together with the discontinuous movement. In a similar manner, the sticky adhesive area on the surface of the crosslinked rubber produces the large dynamic energy difference stored between the stick and slip stages corresponding to the generation of strain energy, which may cause a high friction coefficient and the discontinuous movement of slider (stick-slip motion).
