On 2/22/2018 11:37 PM, Jeff Liebermann wrote:
On Fri, 23 Feb 2018 03:34:42 +0100, Emanuel Berg

Rubber follows a hysteresis curve such as:
https://revisionworld.com/a2-level-level-revision/physics/force-motion/solid-materials/rubber
or:
https://www.google.com/search?q=rubber+hysteresis+loop&tbm=isch
The area inside the loop represent the energy converted to heat by
rolling down the road.

The largest factor in rolling resistance is this energy loss.

I think that's an oversimplification at best, based on an inadequate
definition of "rolling resistance."

I say this because the easiest way to reduce that rubber hysteresis
would be to completely do away with the rubber. Ride on metal tires, as
did the wagons and carriages and "boneshaker" quasi-bicycles of 150
years ago. Bingo! No hysteresis loss!

.... but tremendous rolling resistance compared to a pneumatic tire.

There's a lot more to the phenomenon than hysteresis.


--
- Frank Krygowski