A laminate structure is used for the belt of radial tires and the ply of bias tires that consist of steel cords and rubber, or organic cords and rubber. Properties of the laminate, such as the extensional stiffness and bending stiffness of tire belt, can be estimated using classical lamination theory (CLT). Although interlaminar shear is not considered in CLT, the elastic properties predicted by CLT agree with measurements fairly well. The finite element method is used to predict the effect of the belt structure on the tire performance. Furthermore, the belt structure optimized for maneuverability or durability is obtained by combining the genetic algorithm (GA) with the finite element method.
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