The Effect of Relative Humidity and Roughness on the Friction Coefficient under Horizontal Vibration

Abstract

The present paper investigates experimentally the effect of relative humidity and roughness on friction property of mild steel under horizontal vibration. To do so, a pin-on-disc apparatus having facility of vibrating the test samples at different direction is designed and fabricated. The direction of vibration is horizontal. Horizontal vibration is created along (longitudinal direction) and perpendicular (transverse direction) to the sliding direction. The experimental setup has the facility to vary the amplitudes and frequencies of vibration while velocity of vibration is kept constant. During the experiment, relative humidity, roughness, frequency, amplitude and direction of vibration are varied. The observed ranges of relative humidity and surface roughness were 40%-80% and 0.125-2.5μm (RMS) respectively. Results show that friction coefficient decreases with the increase of relative humidity for horizontal vibration. Friction coefficient is very high at very low roughness and it tends to be high at very high roughness for horizontal direction. It is also observed that the variation of friction coefficient has a particular relationship with the relative humidity and roughness under horizontal vibration.

Evaluate the Effects of Various Surface Roughness on the Tribological Characteristics under Dry and Lubricated Conditions for Al-Si Alloy

“…Wieleba [15] had studied roughness and stiffness of composite materials against steel and showed its effect on the friction and wear. Chowdhury and Maksud [16] have searched the effect of humidity on surface roughness and found that the friction is very high at low roughness and tends to be increased at high horizontal vibration. Al-Si alloys have been studied interestingly, but did not take into consideration the roughness study.…”

Tribological Performance of a Polymer Blend of NBR Used for Stern Bearings

“…A well-known friction phenomenon of audible nature, including chatter and squeal, can take place in stern bearings during start-up, shut-down, running with heavy load, low speed, high temperature and other special conditions. This phenomenon is mainly induced by stick/slip which is in connection with the tribological property of mating pair, such as negative slope of friction-velocity relation [16,17]. The purpose of this work described in this manuscript was to reveal the tribological property of the new polymer blend for stern bearing inner facing material, with comparison to a nitrile-butadiene rubber (NBR) that used for most marine ship stern bearing, especially at the speed less than 2.0m/s.…”

Interdependence of friction, wear, and noise: A review

“…Those would allow to get better evidence of chaotic behaviour and to develop enhanced analysis techniques for noise generation. Abdo et al [58] and Chowdhury et al [59] included the effect of humidity and the frequency of vibration on the amplitude of the stick-slip vibration. It was found that as the frequency increases, the amplitude of the vibrations decreases.…”