Don L Ivey
Texas A&M Transportation Institute
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ASTM special technical publications | 1986
Walter B Horne; Thomas J. Yager; Don L Ivey
Previous National Aeronautics and Space Administration (NASA) Langley aircraft tire friction performance investigations indicated the primary parameter influencing dynamic tire hydroplaning was inflation pressure. The empirical equations derived from aircraft tire test data to estimate tire hydroplaning speed were considered applicable to all pneumatic tires. Some recent studies of several tractor-trailer accidents on flooded highway surfaces, however, suggest that in addition to inflation pressure, truck tire footprint aspect ratio (tread contact area width to length) may significantly effect dynamic hydroplaning speed. Although the truck accident data indicated a new equation to predict highway vehicle dynamic tire hydroplaning speed, collection of additional test data was considered necessary. Tests aimed at obtaining this needed data were initiated by researchers at Texas Transportation Institute (TTI) and NASA Langley. Results from these initial tests using a worn truck tire, an ASTM Specification Standard Tire for Pavement Skid Resistance Tests (E 501) and Specification for Smooth Tread Standard Tire for Special-Purpose Pavement Skid Resistance Tests (E 524) tires are discussed in this paper. The status of the work directed towards developing a new dynamic tire hydroplaning speed equation(s) is reviewed. During wet weather, highway vehicle operators are cautioned to be alert to the possibly lower hydroplaning speeds because of the influence of tire footprint aspect ratio effects when their vehicles are lightly loaded.
ASTM special technical publications | 1975
Gg Hayes; Don L Ivey
The capability of conventional automobile/tire systems to perform a variety of emergency maneuvers was determined. In general, this capability was quantified in terms of the maximum values of longitudinal and transverse vehicle accelerations that could be produced under specific conditions. These vehicle/tire performance measurements are compared directly with common indicators of available friction such as texture measurements and skid numbers. The texture measurements appear to correlate as well with vehicle performance as do direct friction measurements such as skid numbers and British Pendulum Numbers.
Transportation Research Record | 1983
Richard A. Zimmer; Don L Ivey
ASTM special technical publications | 1983
Gg Hayes; Don L Ivey; Bm Gallaway
Transportation Research Record | 1986
Don L Ivey; Dean L Sicking
Transportation Research Record | 1981
Don L Ivey; W Frank McFarland
Transportation Research Record | 1980
Don L Ivey; Hayes E Ross Jr; T J Hirsch; C Eugene Buth; Robert M Olson
Highway Research Record | 1966
Eugene Buth; Don L Ivey; T J Hirsch
Archive | 1992
Don L Ivey; L I Griffin Iii; J R Lock; D Bullard
Transportation Research Record | 1986
Don L Ivey; James R Morgan