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friction coefficients

friction coefficients

friction coefficients

(OP)
Hi everyone!

I have an on-going problem:  I could never seem to find values for friction coefficients on the net ....  I need a list of values for different surfaces in contact, or at least a range of possible values for different materials.  Can anyone please suggest a site that would have this info?

thank you!

RE: friction coefficients

Here are some basic numbers

Static Friction
------------------------------------------
            Clean / Lubricated
Steel             0.8 / 0.16
Copper-lead alloy     0.22 /
Phosphor-bronze     0.35 /
Aluminum-bronze     0.45 /
Brass             0.35 / 0.19
Cast iron         0.4 / 0.21
Bronze             / 0.16
Sintered bronze     / 0.13
Hard carbon         0.14 / 0.11–0.14
Graphite         0.1 / 0.1
Tungsten carbide     0.4–0.6 / 0.1–0.2
Plexiglas         0.4–0.5 / 0.4–0.5
Polystyrene         0.3–0.35 / 0.3–0.35
Polythene         0.2 / 0.2
Teflon             0.04 / 0.04

Dynamic Friction
----------------------------------------------
                Clean Lubricated
Aluminum-aluminum         1.35 / 0.30
Cadmium-cadmium         0.5 / 0.05
Chromium-chromium         0.41 / 0.34
Copper-copper             1.0 / 0.08
Iron-iron             1.0 / 0.15 –0.20
Magnesium-magnesium         0.6 / 0.08
Nickel-nickel             0.7 / 0.28
Platinum-platinum         1.2 / 0.25
Silver-silver             1.4 / 0.55
Zinc-zinc             0.6 / 0.04
Glass-glass             0.9–1.0 / 0.1–0.6
Glass-metal             0.5–0.7 / 0.2–0.3
Diamond-diamond         0.1 / 0.05–0.1
Diamond-metal             0.1–0.15 / 0.1
Sapphire-sapphire         0.2 / 0.2
Hard carbon on carbon         0.16 / 0.12–0.14
Graphite-graphite (in vacuum)     0.5–0.8 /
Graphite-graphite         0.1 / 0.1
Tungsten carbide-tungsten carbide 0.2–0.25 / 0.12
Plexiglas-plexiglas         0.8 / 0.8
Polystyrene-polystyrene     0.5 / 0.5
Teflon-Teflon             0.04 / 0.04
Nylon-nylon             0.15–0.25 /
Solids on rubber         1–4 /
Wood on wood (clean)         0.25–0.5 /
Wood on wood (wet)         0.2 /
Wood on metals (clean)         0.2–0.6 /
Wood on metals (wet)         0.2 /
Brick on wood             0.6 /
Leather on wood         0.3–0.4 /
Leather on metal (clean)     0.6 /
Leather on metal (wet)         0.4 /
Leather on metal (greasy)     0.2 /
Brake material on cast iron     0.4 /
Brake material on cast iron (wet) 0.2 /

Mirekp
http://www.mitcalc.com
Mechanical calculations

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