friction coefficients 1

[danielanarine]

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!:-D

 

[mirekp]

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