STUDY OF CONTACT AREA CHARACTERISTICS AND CONTACT PRESSURE UNDER TYRES ON HARD SURFACE 1694
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Date
2012-12
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JAU,JUNAGADH
Abstract
Tyre deflection is the most important and first parameter for
optimization of tractor performance. It is affected by the constructional
property of tyre, operational parameter such as load, inflation pressure and
the mechanical properties of the surface in contact with tyre. Tyre contact
area on rigid surface is valuable in assessing tyre ground pressure. It
establishes a lower limit for the contact area in yielding soil. Test on rigid
surface provides a basis for reliable and repeatable data. To conduct the
study a test set-up was designed and developed and found most satisfactory.
To conduct study of contact area characteristics and contact pressure under
pressure under tyres on hard surface, four bias-tyre (12.4 * 28), (13.6 * 28),
(14.9 * 28) and (16.9 * 28) were selected and tested in the range of normal
load from 3.93kN to 11.77 kN and the inflation pressure from 69kPa to 193
kPa. Based on the results three prediction models for determining the
percentage of deflection, contact area and ground pressure of the tyres were
developed.
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Engineering and Technology