The Dynamic Friction Tester - The Response to Macrotexture and Microtexture

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dc.contributor.advisor Wilson, D en Jacobsen, Bernard en 2013-03-26T00:51:50Z en 2013 en
dc.identifier.uri en
dc.description Full text is available to authenticated members of The University of Auckland only. en
dc.description.abstract The Dynamic Friction Tester (DFT) is a well known stationary friction measuring device which is used to assess the state of skid resistance of road, airfield and pedestrian surfaces. The Permanent International Association of Road Congresses (PIARC) exponential decay model for the friction curve can be recast in the form + Δ = ∗ Δ which shows that the difference in the friction coefficient evaluated at two slip speeds + Δ and ( ), is a function of the Speed Constant ( ). Thus determining for a given surface, in order to fit the PIARC model friction-speed curve to friction data, becomes important. This is currently attempted by calculating as a linear function of a measure of the surface macrotexture. The DFT has been found to give higher friction values at speed on some surfaces than what is predicted by the PIARC exponential model for the IFI friction - speed curve and it is clear that the texture based Speed Constant ( ) is too low a value to enable a good fit to the friction data for those surfaces. An alternative approach to calculating the value of is given and this is found to give a better fit of the exponential model to the data. Stationary friction measuring devices like the British Pendulum Tester and the DFT record the coefficient of friction of rubber slider(s) in the contact patch, as they sliding across a pavement surface. Although in the past half century much has been learnt about the mechanics of how friction is generated within the contact patch between sliding rubber and the pavement surface, this is seemingly divorced from the operation of these devices. The thesis thus opens with an introduction to the development of the ideas around friction as it occurs with sliding rubber on rough surfaces, then moves onto the application of the DFT to measuring the co-efficient of friction of various surfaces and evaluating the information obtained from these measurements. en
dc.publisher ResearchSpace@Auckland en
dc.relation.ispartof Masters Thesis - University of Auckland en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
dc.rights Restricted Item. Available to authenticated members of The University of Auckland. en
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dc.title The Dynamic Friction Tester - The Response to Macrotexture and Microtexture en
dc.type Thesis en The University of Auckland en Masters en
dc.rights.holder Copyright: The Author en en
pubs.elements-id 375448 en
pubs.record-created-at-source-date 2013-03-26 en

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