Area of Tire Bearing 4

[dik]

There was an earler thread that showed the calculation of the tire 'footprint' bearing area size based on the tire load and the tire pressure. Does anyone have recollection of this posting. I cannot locate it. Thanks, Dik

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

 

[Aesur]

@dik - is this the one you are talking about: Link

 

[Aesur]

Actually, that is steel tire, maybe this one: Link

 

[JedClampett]

C857 has one:

 

[dik]

Aesur... the second one is the one I was thinking about. Thanks

Thanks, Jed...

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

 

[BridgeSmith]

A word of caution when using the AASHTO tire patch load - the 'design truck' is a "notional load", which only approximates the effect of real trucks, so it (and the associated patch load bearing area) should not be used to extrapolate the bearing area for other wheel loads.

Because a vehicle tire is not a balloon, and has far more internal strength and restraint, the actual contact pressure of a tire on a flat support is likely much higher than the psi in the tire. For instance, the AASHTO tire patch for the HS-20 or HL-93 truck (which are essentially the same) is 10" x 20", but if you look at the actual contact area of the dual tires on a tractor-trailer, you'll see 2 patches about 5" long and 6" to 7" wide - 60 to 70 sq. in. Now, truck tire pressures run high, but not the over 200 psi required to make the math work on that.

 

[dik]

Thanks for the added information...

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik