Friction Study of Aircraft Tire Material on Concrete Page: 2 of 35
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i"CH LIBRARY KAFB, NM
NATIAL ADVISORY COMMITTEE FOR AERONAUTI( III II II
066b230
TECHNICAL NOTE 3294
FRICTION STUDY EF AIRCRAFT TIRE MATERIAL ON CONCRETE
By W. G. Hample
SUMMARY
A systematic study has been made of the variation of frictional
resistance between typical tire-tread material and three concrete sur-
faces of different roughness at various temperatures and normal pressures.
Typical tire-tread specimens were taken from the thickest portion of worn
ten-ply tires, and the three concrete test blocks were poured from the
same mix but subjected to different surface finishes. Curves are pre-
sented of the apparent coefficient of friction as a function of normal
pressure.
INTRODUCTION
The friction coefficient plays an important role in determining the
time history of the drag load during a landing impact, but the rapid
changes in normal pressure and temperature during the wheel spin-up have
raised some doubt as to the validity of using static friction data in
which no effects of temperature have been considered. In order to obtain
some insight into the effect of the high temperature and consequent nearly
molten rubber on the friction coefficients, the Boeing Airplane Company
conducted some tests to determine the frictional resistance between typi-
cal tire-tread material and concrete. Although the results were obtained
under conditions considerably different from those encountered in landing
and taxying operations where high skidding velocity may be involved, they
are, nevertheless, of interest because of the range of pressure and tem-
perature covered and because they represent an end-point condition in
airplane operation.
This work has been made available to the National Advisory Committee
for Aeronautics for publication because of its general interest.
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Hample, W. G. Friction Study of Aircraft Tire Material on Concrete, report, September 1955; (https://digital.library.unt.edu/ark:/67531/metadc57498/m1/2/: accessed March 29, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.