Experimental investigation of tyre–road friction considering topographical roughness variation and flash temperature

Grigoriadis, Kyriakos; Mavros, Georgios; Knowles, James; Pezouvanis, Antonios

doi:10.1016/j.triboint.2023.108294

Cited by 6 publications

(1 citation statement)

References 31 publications

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“…[9], friction between tyres and road is strongly influenced by temperature. Moreover, in addition to the friction coefficient (in its hysteretic and adhesion components, as inferred by Grigoriadis [10]), temperature affects the rolling resistance, as underlined by Ejsmont et al in ref. [11], and when it is excessive it can be harmful for the integrity of the tyre, as stated by Marais et al [12].…”

Section: Introductionmentioning

confidence: 91%

Tyre–Road Heat Transfer Coefficient Equation Proposal

Cattani,

Magrini

2023

Applied Sciences

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Tyres are one of the most important elements of a vehicle because they are the link to the road and have a huge impact on traffic-related pollution. Knowing their behaviour, thus being able to use them at their best and reducing their wear rate, is one of the means of improving their lifetime, which means decreasing traffic environmental impact. In order to understand how tyres behave and to predict the real-time tyre–road coefficient of friction, which is strongly influenced by the temperature, in the last few years several complex thermo-mechanical models of heat transfer inside the tyre have been developed. However, in the current state of the art of the literature and practice, there is still an important parameter regarding such models that is not deeply studied. This parameter is the heat transfer coefficient between the tyre and the road at the contact patch, which usually is considered as a constant. The current research paper allows understanding that such an approximation is not always valid for all of the speeds and tyre loads of city and race cars; instead, it is developed an equation that, for the first time, calculates the real-time, dynamic tyre–road heat transfer coefficient, taking into account the tyre’s travelling speed and the footprint length. The equation results are in good agreement with the empirical values coming from the literature and permit understanding how much such a parameter can vary, depending on the tyre use range. The formulation is simple enough to be easily implemented in existing thermodynamic tyre models without requiring meaningful computational time.

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Section: Introductionmentioning

confidence: 91%

Tyre–Road Heat Transfer Coefficient Equation Proposal

Cattani,

Magrini

2023

Applied Sciences

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Temperature Measurements at Tyre Tread Rubber on Sandpaper Oscillatory Sliding Contacts Using Acicular Grindable Thermocouples

Nosko,

Tsybrii,

Torrelio Arias

et al. 2024

Tribol Lett

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The tribological performance of tyre–road contacts depends crucially on the contact temperature. This study investigates the reliability and accuracy of acicular grindable thermocouples possessing an original needle-shaped wearable part as applied to measuring temperature at the oscillatory sliding contact between a rubber tyre tread sample and a sandpaper. A linear oscillatory tribometer is used to imitate the sliding phase of tyre–road contact under mild friction conditions. It is shown that the acicular grindable thermocouple measurements are generally test–retest repeatable. Moreover, the thermocouple signal becomes more stable with increasing contact pressure. Compared to the conventional thermocouple technique, the acicular grindable thermocouple overestimates temperature at the rubber friction surface by about 23% due to involvements of its wearable part in friction with the sandpaper. The findings suggest an expansion of the acicular grindable thermocouple technique to full-scale experiments with tyres on the road.

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