The present paper discusses the effects of reinforcing epoxy by copper wires of different diameters on the electric static charge generated from sliding against rubber sheet. Tests were carried out at dry, water and detergent wetted sliding. The effect of number of wires, location and wires diameter was studied. Based on the experimental observations, it was found that at dry sliding, the voltage significantly increased with increasing the number of wires. As the sliding distance increased voltage increased. It is clearly noted that sliding generated higher voltage than that observed for contact and separation. Voltage decreased with increasing the distance of wire location from the surface. When the wires were closer to the surface, the ability of the surface to generate higher amount of charge increased. The increase in the wire diameter caused significant voltage increase. The influence of wire diameter was more pronounced than the number of wires as well as the location of wires relative to the surface. At water wetted sliding, the presence of water decreased the electric static charge. It is well known that the water leaks the generated charge due to its good conductivity. In contradiction to what was observed at dry sliding, as the sliding distance increased the generated voltage decreased. It seems that sliding facilitated the water to be well distributed on the sliding surface so that the charge relaxation was easier.
Rehab et al. (Wed,) studied this question.
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