beelsebob wrote:speedsense wrote:n smikle wrote:You have wear and degradation. How do you guys define and classify degradation?
Wear would be what the driver/car/track have caused to the tire whether used well or abused.
Degradation could be natural (as designed by the manufacturer, for instance a qualifying tire that only lasts 2-3 laps) or unintentional degradation due to instances outside of the manufacturers control (storage time, shipping, care of the tire-,mountings,sunlight,over/under inflation, etc.) iMHO
My understanding was quite the contrary. Wear is what happens when you race on the tyre for a long time – the rubber wears away. Degradation on the other hand is what produces all the marbles – the structure of the tyre starts to degrade and throw chunks of rubber off.
Not all racing tires throw marbles (at least ones that can be visually seen), depends on the tire. Obviously, unlike the Bridgestones, Pirelli's DO marble and can be visually seen.
All tires wear and start wearing on first use, it's a matter of the rate of wear which would have "controlling" aspects... the "condition" of the forces put through the tire from the driver's input, car's handling/DF, and the track's abrasiveness,temp and layout.
The degradation is one of the aspects/considerations in the production/engineering of the construction (belts,sidewalls etc.) compound (rubber mix) construction (controlled by the maker) is intentional and designed to a purpose and a concise outcome.
I was told once that making a tire is like making a cake. You can make the cake the same way over and over but if the environment it's made in changes from day to day even hour to hour (if the environment it's made in isn't tightly controlled) the cake will turn out different (though made by the exact same process).
Tire Manufacturers tightly control the environment the tire is made in,stored in, and even how it is shipped IE-room/container temperature, humidity, storage time. One manufacturer I've worked with, sends a sensor with the tires to record shipping temps and humidity levels, as another example.
While another manfacturer doesn't track the tire beyond leaving the tire company. Those tires might end up sitting in a storage container in Bahrain in a 110F degree heat (inside container temp 130F) and completely change the compound construction to something else other than engineered (an unintended baking process).
This would be an unintended degradation. Two sets of tires that started out exactly the same, are now entirely different in their compound and will degrade differently. Marked the same, made the same date...but one set had a baking cycle(due to shipping) that wasn't engineered into to it. IMHO.
***sorry for hijacking the thread and making it about tires, but in my opinion will become/has become a major difference in the chassis' especially between Red Bull and Mclaren. The outcome of the races and the eventual WDC,WCC will be more about tire use, wear and degradation rates than ever before.
"Driving a car as fast as possible (in a race) is all about maintaining the highest possible acceleration level in the appropriate direction." Peter Wright,Techical Director, Team Lotus