Abstract:
Friction and wear properties of mild steel are tested in a pin-on-disc type apparatus.
The effects of vibration on friction and wear of mild steel are taken into
consideration. An experimental setup is designed and fabricated by which the friction
co-efficient of mild steel plate is measured. During the experiment, normal load,
speed, vibration, relative humidity and surface-finish of disc are varied. Effects of the
above parameters on friction and wear properties of mild steel are measured. Two
types of surface-finish ('as-turned' and 'as-ground') are considered for disc sample.
Friction co-efficient is measured as the ratio between horizontal and normal forces.
Wear rate is measured by taking weights before and after abrasion loss of mass. It is
observed that the friction co-efficient increases linearly with duration of rubbing upto
a certain time and becomes constant afterwards. Both the friction co-efficient and the
wear rate increase with the decrease of relative humidity. Friction co-coefficient
remains almost constant with normal load. But wear rate increases with increasing
normal load and increasing linear velocity. Rate of increase of frictional co-efficient
is more at lower linear velocity than that at higher linear velocity. Values of friction
co-efficient and wear rate also depend on the type of surface-finish. In these
experiments, for 'as-ground' surface, wear rate was found to be 44% and friction coefficient
was found to be 40% to 45% less than that for 'as-turned' surface. The
difference of frictional co-efficient and wear rate of vibrating and non-vibrating
plates increase with the increase of frequcncy of vibration.
