What is the static COF for rubber on steel?

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SUMMARY

The static coefficient of friction (COF) for rubber on steel is estimated to be around 0.7, based on various sources discussed in the forum. Users have noted that while specific data is scarce, assumptions for rubber go-kart wheels on steel surfaces range from 0.9 to 1.0, which may be overly optimistic. The discussion highlights the variability of COF due to different grades of rubber and finishes of steel, suggesting that experimental validation may be necessary for precise applications, particularly in combat robot design.

PREREQUISITES
  • Understanding of static coefficient of friction (COF)
  • Familiarity with material properties of rubber and steel
  • Basic principles of robotics and combat robot design
  • Knowledge of experimental methods for friction testing
NEXT STEPS
  • Research the static COF for various rubber grades on steel surfaces
  • Explore experimental setups for measuring friction coefficients
  • Investigate the impact of surface finishes on COF between rubber and steel
  • Review standards for combat robot materials and design specifications
USEFUL FOR

Engineers, combat robot designers, material scientists, and anyone involved in robotics or friction analysis will benefit from this discussion.

Mech King
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Hello all,

im trying to find some data for the static COF for rubber on steel. I have been looking hard but can only find info for rubber on concrete and other non metals.

I am doing the initial sums for a combat robot I am designing, but want to get the figures sorted out before i spend any money.

Best Regards,

Mech King
 
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Can only find lubricated, sliding COF for those surfaces in my references. It's 0.05.
 
Hi brewnog, thanks for the reply.

Ye i's on of those combinations of materials that you would expectt here to be lots of info for the COF, but suprisingly not.

I have assumed a COF of about 0.9 to 1 for a rubber go kart wheel on a steel surface. I cannot find any exact grade of steel for the combat surface in the fighting robot standard.

Its always been one of those "suck it and see" areas for me (please excuse metaphor).

Cheers
 
Last edited:
This website here says Rubber on steel static friction coeff = 0.7

http://hypertextbook.com/facts/2005/steel.shtml

maybe this will help too. You may just want to make up your own experiment.
http://www.gordonengland.co.uk/sef/steel-rubber-friction-t-460.html
 
I'd believe 0.7 (0.9 sounds very optimistic).
 
Cheers for the responses guys, 0.7 sounds like the winner, i iwll have a closer look at these links aswell,

Thanks

Mech King
 
In addition, there are lots of different grades of rubber and lots of different grades and finishes of steel, so the COF will probably have a pretty wide range.
 

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