In a tire delamination event, the separation begins when fatigue cracks develop circumferentially at the interface between the two steel belts of a radial tire. Normally, there will be a single location on the tire where the cracks develop into a large pocket under the tread. When this pocket is sufficiently large, the tread and outer steel belt will separate from the inner belt and form a flap, either a leading edge flap or a trailing edge flap, depending on pocket size, vehicle speed, tire temperature, load history, pressure history, amount of remaining tread etc. Several studies have been performed that indicate that a tire delamination event produces moderate vehicle force inputs, which are normally easily controlled by a driver. These studies have produced the occasional run in which the forces are more significant. The purpose of this study was to explore the forces created at the wheel hub when a tire delamination occurs. These forces act on the vehicle and therefore are important in explaining the resultant vehicle dynamics. Since a number of on-vehicle studies have been done using tire delaminations created by cutting tries, another purpose of the study was to determine if there were differences in the forces generated that were dependent upon the cutting method or the age of the tire. It was also desirable to produce force levels that more reasonably described on-vehicle tire delamination. A sample application of the forces measured was used in a simple vehicle simulation to evaluate the effect on vehicle trajectory. Experiments and data show that delaminations of worn tires are very likely to lose all, or nearly all, of their tread and outer steel belt. The tread from a delamination event almost always ejects in the line of travel of the tire. The delamination event itself does not damage the tire casing or cause deflation of the tire. The primary forces generated by a delamination event are in the tractive and vertical directions. The vertical force primarily results from the folded tread passing through the contact patch. The tractive force results from the interaction of the tread flap with the vehicle bodywork.
Force characteristics of tire tread delamination
Kräfte auf das Fahrzeug beim Ablösen einer Reifen-Lauffläche
2004
13 Seiten, 6 Bilder, 3 Tabellen, 6 Quellen
Aufsatz (Konferenz)
Englisch
Force Characteristics of Tire Tread Delamination
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