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The paper presents some aspects of the experimental investigation of shear stresses in the tire-road contact patch. The rolling process is achieved by loading a freely rotating tire against a movable table. The rig structure, measuring stages, and special developed programs are mentioned. A comparison between treadless and pattern tread band design, pertaining to shear stress distribution, is presented. The influence of inflation pressure and normal force values on the shape and magnitude of the shear stresses is also shown.

The interaction tire-road at high speeds of rolling is a principal source of noise and vibration and influences the passenger comfort and safety. The paper presents the experimental and theoretical research on radial vibrations of tire tread-band at different rolling speeds. The experimental research involves the measurement of tread-band vibrations at 100 km/h, 140 km/h and 180 km/h rolling speeds. Also, the radial natural frequencies and corresponding mode shapes were measured. A two-dimensional finite element model was created for modal analysis and for study of tread-band radial vibrations at the mentioned rolling speeds. Likewise, the model enables the study of tire standing wave phenomenon. In order to correlate the model natural frequencies with the real tire ones, a model updating procedure was applied. The results offer useful information on the magnitude, on the circumferential distribution, and on the periodicity of tread-band radial vibrations.