RELATIONSHIP BETWEEN TIRE DEFLECTION CHARACTERISTICS AND 2-D TIRE CONTACT AREA

ABSTRACT We have developed mathematical expressions for 2-D contact length, contact width, and contact area of a pneumatic tire on a rigid surface based on the geometry and deflection characteristics of the tire. These expressions show that the 2-D contact area is elliptical when the tire deflection is small but becomes rectangular with curved edges as the deflection increases. The model predictions were verified using experimental results obtained using 16.9R38, 18.4R38, and 24.5R32 tires. Simulation studies were conducted to predict the effects of tire load, inflation pressure, and geometry on contact traces.