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Investigates friction coefficient in various tread designs on rubber surfaces, highlighting safety implications.
ABSTRACTThere is an increasing demand to investigate proper solutions for reducing slip and fall accidents. The friction of footwear on floor coverings is responsible of the occurrence of slips and falls. The slip resistance is normally assessed on the basis of friction coefficient measured with footwear materials sliding against floorings. In the present work, the effect of rubber flooring provided by cylindrical treads on the friction coefficient is investigated.It was found that at dry sliding, friction coefficient significantly increased with increasing treads diameter, where (90°) and (45°) tread directions displayed the highest friction coefficient which reached a value of 0.92 at dry sliding. As for lubricated sliding surfaces, significant decrease in friction coefficient was observed in the presence of water on the sliding surface compared to dry sliding, where friction coefficient decreased with increasing treads diameter.In the presence of water/detergent dilution, friction coefficient drastically decreased to values lower than that displayed by water. Parallel treads showed the highest friction coefficient, while perpendicular treads displayed the lowest friction values. Presence of oil on the sliding surfaces displayed a decreasing trend of friction coefficient with increasing tread diameter as a result of the presence of squeeze oil film separating footwear and rubber flooring. Values of friction coefficient were 0.10, 0.085 and 0.06 for 90°, 0° and 45° tread directions respectively. Furthermore, emulsion of water and oil showed slight friction increase compared to oil lubricated sliding.
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El-Sherbiny et al. (2011) studied this question.
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