Experimental Studies on the Influence of Studded Tyres on the Steering Behaviour 785047

Tungsten carbide studs are used in passenger car and truck tyres in the northern countries extensively and they cause an increasing wear of road surfaces. New tyre and stud combinations must be developed for reducing the wear without loss of traffic safety. The report describes a set of instrumentation and proposes a test method for evaluating the relative merits of various stud and tyre combinations in dynamic driving conditions. At this stage a simple step test is used and the results of the car tests are shown in the form of graphs of the front and rear slip-angle difference vs. time and yaw angle vs. time. The effect of ambient changes is also described. The results of truck tyre tests are shown as a comparison of the relative slip-angle gain. The effectiveness of studs is clearly shown in both types of vehicle.