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Rolling contact between agricultural tire and deformable ground

While external tire mechanics deals with the effect of tires on vehicle behaviour, internal tire mechanics is focused on computation of stress‐strain and heat states in a tire. Analytical and numerical analysis of different level tire substructure is a pre‐condition for a better understanding of tire behaviour and for a suitable choice of practical calculation schemes. The tire is described geometrically non‐linear as a multi‐layered anisotropic torus shell with low transfer shear stiffness. The strains are assumed to be small, however, the cross‐sections of the tire shell will exhibit moderate rotations. In order to reflect energy losses the visco‐elastic behaviour of tire rubber‐cord‐composite is taken into account. Results are used for the determination and improvement of stiffness parameters for external tire models and for Böhm's mass points approach for transient loading of a rolling tire on rigid and deformable ground. This model is modified to the real structure of an agricultural tire with lugs. The soil under the tire is described by different rheological laws of ground surface behaviour in normal and tangential direction. The numerical results of contact calculation are compared with experimental data gained by mechanical multi‐point measurement technique in order to determine the displacements in the inner of a rolling tire. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)