SLIDING FRICTION OF A SMOOTH TIRE ON A ROUGH GH MOIST PAVEMENT SURFACE – EVALUATION OF TWO PREDICTION METHODS

摘要

Analytical and numerical tools that can provide reliable and accurate estimates of wet pavement frictionalresistance would preclude the need for time consuming field tests and be invaluable in frictionmanagement programs. Therefore, many research efforts have been made to develop such tire pavementfriction predictive tools. However, due to the complexity of the problem, most existing tools aredeveloped based on several assumptions while their predictions are not verified with field data. This studyis focused on the evaluation of two particular prediction methods that can be used to predict friction on asmooth tire sliding on a rough moist pavement by comparing the corresponding predictions with theresults of field experiments. A 3-dimensional finite element model (FEM) formulated in ANSYS softwareand an analytical method based on computing hysteresis friction from viscous energy dissipation are thetwo methods considered in this study. Both prediction tools are capable of rough pavement surface texturewhile the FEM method can even incorporate the tire geometric and material properties. Predictions of thetwo methods based on the macrotexture data on a selected test surface provide reasonably accurate resultswhen compared to the corresponding field evaluation. The main finding of the investigation is theavailability of relatively easily executed analytical methodologies that are comparable in accuracy tomore rigorous finite element tools.