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Bead Contact Pressure Measurements at the Tire-Rim Interface
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English
Abstract
A method has been developed for measuring the normal contact pressure distribution at the interface between a tire and a rim using a miniature magnetostrictive transducer as the load sensor. The transducer itself is a 0.050 in. diameter nickel ferrite toroidal core wrapped with primary (excitation) and secondary (sense) windings. As the core is stressed, the magnetostrictive phenomenon causes an increase in the magnetic flux and a corresponding change in the induced output voltage across the sense windings. This voltage change is signal conditioned to yield a dc voltage output as a function of core stress which is proportional to the bead contact pressure.
Bead contact pressures were mapped at the interface between various radial tires and rims under static and dynamic loading conditions. Static pressure distributions obtained for the inflated but otherwise unloaded condition provide a measure of the conformability of the tire to the rim. Dynamic pressure distributions show stress patterns developed under straight-ahead rolling and cornering conditions.
With the aid of such bead contact pressure measurements, stress analysis studies of tires and wheels can now be conducted on a more rational basis than done in the past because the exact nature of the load distribution at the tire-rim interface is known for various tire loading conditions.
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Authors
Citation
Walter, J. and Kiminecz, R., "Bead Contact Pressure Measurements at the Tire-Rim Interface," SAE Technical Paper 750458, 1975, https://doi.org/10.4271/750458.Also In
References
- Lubkin J. L. “Contact Problems” Handbook of Engineering Mechanics Flugge W. New York McGraw-Hill 1962
- Christensen R. M. “Theory of Viscoelasticity” New York Academic Press 1971 63 72
- Yearbook The Tire and Rim Association, Inc. Akron 1974
- Davisson J. A. “Design and Application of Commercial Type Tires” New York Society of Automotive Engineers January 1969
- Walter J. D. “Tire Stress and Deformation” Mechanics of Pneumatic Tires, NBS Monograph 122 Clark S. K. Washington, D.C. U.S. Government Printing Office 1971 405 444
- Pond J. W. “Run Flat Tire for C-130 Aircraft” Technical Report AFFDL-TR-73-82 Wright-Patterson Air Force Base August 1973
- Moore K. J. “Design of Tyre Beads for Interference Fit” Paper presented at Second Australian Rubber Technology Convention of the Institution of the Rubber Industry (Australian Section) Melbourne October 1971
- Zaharov S. P. “Feasibility Study of How to Make Compression Measurements of the Tire Bead Against the Rim” 16 8 1957 30 31
- Balabin I. V. Zubarev N. A. “Force Interation Between a Wide Profile Tire and the Wheel Rim” 30 6 1964 16 19