FRICTION CHARACTERISTIC EVALUATION METHOD OF RUBBER MATERIAL ON WET ROAD SURFACE

摘要

PROBLEM TO BE SOLVED: To provide a friction characteristic evaluation method of a rubber material capable of evaluating different rubber materials including the difference of a road surface, concerning a wet friction force of each rubber material used for a tire or the like.;SOLUTION: The wet friction force F of a rubber material is expressed by expression: F=(1-E_hl)×F_a+F_h by using the first friction force F_h, the second friction force F_a and a coefficient E_hl. The first friction force F_h generated when the rubber material is slid along the road surface is determined from a profile of the wet road surface, and the second friction force F_a generated when the rubber material is stuck onto the road surface is determined from the profile of the wet road surface, and (1-E_hl)×F_a is determined by subtracting the first friction force F_h from a measurement result of the wet friction force F. By using the value and the the second friction force F_a, the coefficient E_hl for lowering the contribution of the second friction force to the wet friction force F by interposition of a water film between the rubber material and the road surface is determined. The wet friction force is evaluated by using the first friction force F_h, the second friction force F_a and the coefficient E_hl.;COPYRIGHT: (C)2007,JPO&INPIT