Full-field strain measurements of the inside of an agricultural tyre using digital image correlation
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Date
Authors
Feldesi, Filip
Botha, Theunis R.
Els, Pieter Schalk
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Abstract
This paper investigates strain measured on the inside of an agricultural tyre with large tread-blocks during a series of static tests using a novel measuring system. The full field strain measurements may be used in the development of a tyre which is capable of estimating tyre forces from strain measurements. The strain measurement system makes use of a calibrated stereo camera system on a mechanical stabilizing system that keeps the cameras pointed at the inside surface of the tyre in contact with the road while the wheel rotates. A static tyre test rig is used to displace the road surface relative to the tyre in the vertical and longitudinal direction. The large tread-blocks caused strain concentrations on the inner surface as the tyre deforms to comply with the road surface. Vertical and longitudinal tests each produce unique strain patterns in the contact patch region. Relationships between the applied forces and strain measurements were developed and showed that these relationships are near linear with R2 values above 0.97. The strain measurements also show that the location where strain gauges, for single point strain measurements, are placed inside the tyre is very important on large lugged tyres.
Description
Keywords
Contact patch, Stereovision, Strain, Tread-block, Digital image correlation (DIC)
Sustainable Development Goals
Citation
Feldesi, F., Botha, T.R. & Els, P.S. 2020, 'Full-field strain measurements of the inside of an agricultural tyre using digital image correlation', Journal of Terramechanics, vol. 91, pp. 309-318.