Modeling of rubber-cord layers under quasi-static loading

Modeling a pneumatic tire with strong change in shape causes the problem of choosing an adequate model for rubber-cord plies. Generally, classical method asymptotic homogenization is not suitable due to physical and geometrical nonlinearity strain up 15 %. The known models used simulation entire as well plies are analyzed. A choice made favor modeling using stress anisotropic potential, which function tensor invariants. relationship such constitutive law quasi-linear equation terms differentials indicated. convenience these two types equations numerical implementation also given. modification effective properties definition inhomogeneous layer explained. difference from standard moduli clarified. arrangement cords supposed be approximately periodic all equivalent fiber. Two described under assumption. These orthotropic material transversely isotropic material. Computational experiments, make it possible determine parameters potentials, pointed out. Real tests sample rubber ply slow quasi-static loading were conducted. Significant hysteresis was detected. It shown that additive combining hyper elastic Maxwell viscoelastic provides good accuracy dependence on rate. procedure developed calculate solution deformation described. implemented home-made computer code. example That so-called breaking test, achieved applied to.