Abstract
Abstract This paper reports the results of an extensive design of experiment (DOE) conducted on radial medium truck tires by the ASTM Committee F09.30 Task Group on Truck/Bus Tire Test Development. These results are from Phase I of the task group’s work, operational (“real world”) tire temperature benchmarking. DOE variables were tire inflation, load, and speed. Response temperatures from embedded thermocouples were measured at apex/ply ending, no. 2/no. 3 belt ending, and shoulder and centerline ribs. Steady-state temperatures for steer, drive, and trailer tires from three different test venues are compared, i.e., flat belt lab machine, road/track, and 1.7 m diam laboratory roadwheel. Results from temperature regression modeling are discussed. Examples of the effects of a curved test surface on tire operating temperatures as well as on tire strain levels are provided. Model predictions are used to compare temperatures and strains of tires running at current Federal Motor Vehicle Safety Standard (FMVSS) 119 test conditions versus a severe service long-haul truck operating condition. The concept of “highway speed equivalency” for laboratory endurance testing is proposed.
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