k value, 40:00 X 57 tire.
k value, 40:00 X 57 tire.
(OP)
I am interested in the K value, (vertical spring constant, kips per inch of deflection) of a 40:00 by 57 bias tire. The tire is inflated to 145 psi and carries 300 kips at very low speed. Does anyone have test data?
The second part of the question is: What happens to the apparent vertical spring constant if the tire moves over a step such as moving over a 6 inch curb?
The second part of the question is: What happens to the apparent vertical spring constant if the tire moves over a step such as moving over a 6 inch curb?





RE: k value, 40:00 X 57 tire.
RE: k value, 40:00 X 57 tire.
I was beginning to think that nobody read this message, thanks for the responce...the tire is 76 ply.
RE: k value, 40:00 X 57 tire.
RE: k value, 40:00 X 57 tire.
Can anyone tell us what happens when a tire goes over a step? I would think that the apparent K value becomes smaller, say 60 per cent. Does anyone have experience to confirm this with smaller tires, even if the tires are highway truck tires or earthmover tires?
RE: k value, 40:00 X 57 tire.
There is a problem with most analytical tire models in that the tire 'sucks down' onto a step, sadly that is all I know.
you might have some luck with any of pacejka's books, or the ftire's developer http://www.cosin.eu/prod_FTire who seems to be a jolly helpful person.
Cheers
Greg Locock
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