INFLUENCE OF SLIDING DIRECTIONS ON FRICTIONAL PROPERTIES OF GFRPS AND DFRPS

摘要

Coefficients of friction on surfaces of glass fiber reinforced plastics (GFRPs) and Dyneema~(~R) fiber reinforced plastics (DFRPs) were systematically measured at liquid helium, liquid nitrogen, and room temperatures. GFRPs have been widely used for bobbins and spacers in superconducting magnets. Since DFRPs expand with decreasing temperature, it is expected that DFRPs will become materials of the bobbins and spacers to increase stability of the superconducting magnets against frictional disturbances due to conductor motions. The structure of these plastics is that mesh fibers are stacked with epoxy resin, and hence, the plastics have anisotropy of their mechanical properties. We measured the frictional coefficients in three sliding directions on the surfaces of the plastics. To explain the measured data, the surfaces were analyzed using scanning electron microscopy and infrared spectroscopy. The analytical results were almost consistent with the measured data.