Flattened Reinforcing Element Microhardness Gradient Tyre Cornering

The patent applies local quality by creating a non-uniform microhardness distribution within the reinforcing element. The central region has lower microhardness (Uc) while the lateral edges have higher microhardness (U1), creating a controlled gradient that reduces the stiffness mismatch with the elastomer matrix at the interface. This local variation in mechanical properties allows the reinforcing element to better accommodate high cornering stresses without creating stress concentration points, thereby maintaining cornering stiffness and handling effectiveness at high side slip angles.

The patent modifies the lateral edges of the reinforcing element to have higher microhardness (U1) compared to the central region (Uc). This creates a gradient that reduces the abrupt stiffness mismatch at the interface between the reinforcing element and elastomer matrix. The elevated microhardness at the lateral edges specifically addresses the interface region where shear forces concentrate, reducing the likelihood of rupture initiation while maintaining the overall structural reinforcement provided by the flattened cross-section geometry.

The patent deliberately creates a microhardness gradient where the central region (Uc) has lower microhardness compared to the lateral edges (U1). This inverted approach ensures that the steepest stiffness gradient is located at the lateral edges where the interface with elastomer matrix occurs, rather than at the center. The lower central microhardness reduces stress concentration in the bulk of the reinforcing element, while the higher edge microhardness manages the interface transition smoothly.