The knowledge of the tire tread viscoelastic properties, deeply affecting the tire dynamic behavior, is a particularly crucial topic for tire manufacturers to achieve the optimal friction performance and to govern the degradation mechanism during the tire life cycle. To this purpose the use of a friction model, called GrETA. (Grip Estimation for Tire Applications), aiming to predict the friction coefficient arising at the tire-road interface under various possible operating conditions (temperature, pressure and relative velocity), is proposed. The GrETA. model requires both the roughness parameters, associated with micro-and macro-scale of the road profile, and the viscoelastic properties of tire tread compound, function of temperature and excitation frequency, in order to mathematically describe the contact phenomena between the rubber surface and the substrate countersurface. The compound characterization has been achieved employing a non-destructive methodology called VESevo, capable of estimating the viscoelastic Storage Modulus and Loss Factor, whereas the road profile characteristics have been optically acquired and synthetized. To validate the model outputs, a specific experimental campaign has been conducted employing an evolved version of the British Pendulum bench with different road profiles and compound specimens.

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