Experimental investigation of the effect of vibration on friction between solids

Abstract

This work examines how friction coefficient is affected by amplitude and frequency of vibration at different directions of vibration. Variation of friction coefficient with the amplitude and frequency of vibration and induced jerk is experimentally investigated at different directions of vibration. This is done by sliding a mild steel pin on different types of material such as. glass fiber reinforced plastic (GFRP). ebonite. polytetrafluoroethylene (PTFE). rubber and mild steel. A pin-on-disc apparatus having the facility of vibrating the test samples is designed and fabricated to give different directions. amplitudes and frequencies of vibration. The directions of vibration are both vertical and horizontal. Horizontal vibration is created along and perpendicular to the direction of sliding velocity. The effects of sliding velocity. duration of rubbing. roughness. normal load. relative humidity and lubrication on friction are investigated in this research work. Studies have shown that the value of friction coefficient depends on the amplitude. frequency and direction of vibration. It is observed that friction coefficient decreases with the increase of amplitude and frequency of vibration when the direction of vibration is vertical. On the other hand friction coefficient increases with the increase of amplitude and frequency of vibration when the direction of vibration is horizontal. The horizontal vibration can be of two types. one in the longitudinal direction. and othe,r in the transverse direction. Magnitude of friction coefficient for longitudinal vibration is less than the magnitude obtained under transverse vibration. Experiments are carried out for frequency of vibration from 0 to 500 Hz and amplitude of vibration from 0 to 200 microns. In this study. it is also observed that the percentage variation of friction coefficient has a particular relationship on the amplitude, frequency and direction of vibration. The experimental results are compared with those available in the literature.