Abstract
The present study is meant to obtain tribological insight into the interface of a rolling rubber wheel on a counter-surface disk based on the work of the previous study Salehi et al. (Tribol Lett 68(1):37, 2020), in which a new test method was developed to rapidly predict tire grip in a laboratory environment. A Laboratory Abrasion Tester (LAT100) was used and exploited as a tribometer. This opened a new cost- and time-effective horizon for tire material development in a laboratory environment rather than having to test tread compounds by building full-scale tires. The method was validated by a comprehensive study for six different tire tread compositions, by correlating the laboratory data for solid rubber wheels as LAT100 specimens with real tire results in two test modalities: lateral (α) and longitudinal (κ) sweep tests on a dry road. It was demonstrated that the LAT100 can be exploited to simulate the alpha-sweep tire tests, but not the kappa-sweep. The dynamics and physics of a rolling rubber wheel on a counter-surface disk of the LAT100 test step-up are investigated utilizing the renowned physical “brush model” in comparison to full-scale tire tests. The type of test modality leads to different friction mechanisms in the contact patch even at similar test conditions. This is substantiated by recognizing the two regions: stationary and non-stationary, in the contact area which results in different friction components and mechanisms. The behavior of the rolling wheel in lateral and longitudinal movements at the same test conditions is comparable if the contributions of the mentioned regions in the contact area are similar.
Highlights
Tire grip or traction is a concept that describes the grasp and interaction between the tire and the road to avoid vehicle skidding or sliding, crucial for safety
The tire grip is the result of the generated frictional forces in the aforementioned driving states which are created by tire slippage in the contact patch
Accelerates, or corners, the tire tread elements in the contact area move a noticeable displacement in relation to the road
Summary
Tire grip or traction is a concept that describes the grasp and interaction between the tire and the road to avoid vehicle skidding or sliding, crucial for safety. Accelerates, or corners, the tire tread elements in the contact area move a noticeable displacement in relation to the road This has been elaborated in detail in our previous study [1]. It was shown that there was no correlation between the two different test modalities of α- and κ-sweep data of the tire at the peak points of the friction curves for all six tread compounds, though the test was performed at the same test conditions. The present study supports the previous work by creating more insight into the wheel rolling dynamics to understand the acquired correlations between the laboratory and the road by comprehending the involved friction phenomena and mechanisms in the contact patch. The previous conclusions become more concrete and answers to remaining questions are provided
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