This paper describes a study examining the friction loads resulting from cylindrical structure sliding contact with asphalt without gouging. During a rollover event the vehicle roof structure interacts with the ground. Friction can account for a large portion of the dissipation of vehicle energy during these events. Only friction values at low pressures have been reported previously. Determination of the friction values observed under the higher pressure values expected during certain A-pillar to asphalt interactions was addressed in this study. First, sections of asphalt roadways were obtained. Both new and used portions of roadway were used. A smooth, elliptically shaped counterface representative of a roof structure component was utilized. A robotic test device allowing control of speed, compressive forces, and temperature and measurement of traction forces was utilized under controlled conditions [1]. Studies were conducted at 21° C and 68° C. The results show that an average friction of .70 is observed across all the samples with a range of up to 1.2 in metal to asphalt interaction without gouging.

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