Tire slip angle diagram: wet vs. dry

[JasonCSBB]

Hi all,

Does someone have a link to a tire slip angle diagram, so I can see how it changes from dry to wet?
I want to understand why tires behave the way they do in the wet (e.g., cornering force past the peak at very high slip angles, is a larger % down from the peak, in the wet vs. dry, or the dropoff is more abrupt).

Cheers.

 

[cibachrome]

SAE published a graph showing the general nature of a tire Fy responce at a fixed load vs. slip angle. Water softens the initial stiffness, drives down the peak and moves it to a higher slip angle.

On ice, there really is no peak, just an early max and a flatline after that.

Gravel is another animal. Its low stiffness but force continues to build. Just imagine the tire on ball bearings. As you turn it more, you plow the ball bearings out of the way and utilize more of what's beneath them.