There has long been a strong desire to know the deformation and surface shape of tires rotating at high speeds, both in order to verify finite element modeling analysis results and for the design of tire construction and materials. We used the sampling Moiré method to measure sidewall deformation and surface strain of rotating tires when cornering or braking. This method takes photos simultaneously with two cameras placed at a distance from a tire sidewall with a grid sheet laid over it, allowing precision 3D rendering through analysis of these images. This enables a practical and accurate chronological measurement of deformation and surface strain in tires rotating at high speeds, something that was difficult to do until now. But owing to hardware limitations, this had only previously been done in the static state. By combining the sampling Moiré method with high-speed, high-definition cameras, it is possible to measure the time-based shape and surface strain of tires rotating at high speeds, with practical accuracy. In this paper we have made continuous, time-based measurements of surface strain when a sinusoidal slip angle is applied to the tires and measurements of changes in surface strain when enveloping a cleat.

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