Ulster University Logo


Woodward, David, Millar, Phillip, Friel, Shaun and Waddell, Campbell (2013) MEASURING GRIP AND THE CONTACT PATCH. In: Airfield and Highway Pavement 2013, Los Angeles. American society of Civil Engineers. 12 pp. [Conference contribution]

PDF - Published Version


A vehicle or air-craft tire interacts with a surfacing through its contact patch. Wet grip is one of the most important properties of a highway or airfield surfacing. This paper looks at the contact patch for the GripTester device, widely used around the world to assess both highway and air-field skid resistance. Contact patch properties were measured using a XSENSOR pressure mapping system. The relationships between inflation pressure and properties such as contact area, length and width were assessed for a new and worn GripTester tires. Pressure mapping was found to provide high quality data with the found relationships agreeing with previous research. Contact patch data was related to in-situ measurement of wet grip measured using GripTester fitted with both tires at a range of tire inflation pressures and for a range of asphalt surfacing types. This found robust relationships between inflation pressure, measured wet grip, contact patch area and tire wear. Most relationships were as expected, however it was found that increasing contact area related to a decrease in measured wet grip for the new tire. The distribution of contact pressure within the contact patch is as suggested as a one of a number of areas that warrant further consideration.

Item Type:Conference contribution (Paper)
Faculties and Schools:Faculty of Art, Design and the Built Environment
Faculty of Art, Design and the Built Environment > School of the Built Environment
Research Institutes and Groups:Built Environment Research Institute
Built Environment Research Institute > Studies Allied to Built Environment Research (SABER)
ID Code:26380
Deposited By: Dr David Woodward
Deposited On:30 Jul 2013 15:04
Last Modified:09 Dec 2015 11:13

Repository Staff Only: item control page