Abstract
The most important task of the tire is to ensure driving safety by optimally transmitting the required longitudinal and lateral driving forces. Although great progress has been made in the past in the development of new materials and patterns, many questions remain unanswered in the field of elastomer friction on rough surfaces. This is particularly true when an additional intermediate medium is introduced into the contact, as for braking on wet roads in the form of water. To better understand this process, a model of a single-tread block on a rough road surface is developed. The influence of the fluid is represented by a physical meaningful friction law. The model is validated with results of tire wet-braking tests on an internal drum test rig. The model can map the interaction between tire tread, rough road surface and fluid film and the simulation results show a good agreement with the measurement results. Based on the investigation of individual tread blocks, a new approach to the description of the wet-braking behavior of passenger car tires was thus demonstrated, which can be extended to more complex tread geometries in the future.
Highlights
The main function of tires is to ensure safe driving by optimally transmitting the required braking and steering forces
Great progress has been made in the past in the development of new materials and patterns, many questions remain unanswered in the field of elastomer friction on rough surfaces
The material properties of the rubber are considered by a viscoelastic and a hyperelastic material law
Summary
The main function of tires is to ensure safe driving by optimally transmitting the required braking and steering forces. Great progress has been made in the past in the development of new materials and patterns, many questions remain unanswered in the field of elastomer friction on rough surfaces This is true if an additional intermediate medium is introduced into the contact, such as for braking on wet roads in the form of water. The visco-elastic behavior of the rubber is modeled by a KELVIN-VOIGT element and the frictional force results from the asymmetry of the pressure distribution on the uneven road surface This model is extended in [13] by the intermediate medium water. Contact between the rubber and the road surface on many length scales is necessary for the transmission of braking forces through hysteresis friction For this purpose, the water film in contact must be squeezed out. The test results can be used to validate the model, only a single-tread block is modeled
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