Coefficient of Wet Friction of Tire Treads

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Abstract
The schematic presentation in Figure 1 is an attempt to demonstrate the importance of friction coefficient in matters of driving safety and abrasion resistance, which are of interest to both tire manufacturers and users. References 1 to 3 present the viewpoint of road engineers, designers of motor vehicles, tire producers, rubber compounding experts, and various suppliers of different raw products. The numerous factors involved in producing skid resistant tires are summarized in Figure 2. From among such factors, we take up, here, only the tire element within the contact surface of the tire. The coefficient of friction for this element was investigated with test specimens, preferably under wet conditions, as a function of speed, temperature, and load, and against friction bases that exhibited a variety of grip characteristics. This coefficient of friction is affected by a number of other variables, Tables I and Ia, some of which will be discussed in this article.

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