From: fortunati.luigi@gmail.com   
      
   Thomas Koenig sabato 31/03/2018 alle ore 14:57:29 ha scritto:   
   >> A stationary machine of 300 kg compresses the tread of its wheels   
   >> against the asphalt by 3 millimeters.   
   >>   
   >> If the same machine is running at high speed (without bumps or jolts),   
   >> does the compression of the tires remain the same or decrease compared   
   >> to the 3 mm that it had when it stopped?   
   >   
   > The answer is, "it depends".   
   >   
   > Are we talking gas-filled tires or solid tires?  I am assuming   
   > some kind of rubber as the material.   
   >   
   > Energy dissipation in the tread will result in higher tread   
   > temperature, resulting in lower elastic modulus - the tread will   
   > become softer, and the machine will tend to sink down more.   
   >   
   > Heat dissipation will also lead to a higher temperature of the   
   > gas filling (if any), which will increase the internal pressure   
   > and make the tire harder, so the machine will sink down less.   
   >   
   > Finally, centrifugal force (splease skip the discussion if that's   
   > real or not :-).   This will increase the outer diameter   
   > of the tire.   
   >   
   > Tires, especially automobile tires, are a well-known and (one   
   > hopes) well-understood field of engineering.  I suspect there is   
   > ample literature on the subject.   
      
   We are talking about full rubber tires (without gas), and we neglect   
   temperature variation and centrifugal force.   
      
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