A-32
Engineering Guide CDA3000
Appendix A Formula bank
Coefficients of friction of various material pairings
Lever arm of rolling friction for various material pairings
Density ρ of various materials
Friction pairing Friction type Coefficient of friction
Steel on steel
Static friction (dry)
Sliding friction (dry)
Static friction (greased)
Sliding friction (greased)
µ
0
=0.12-0.60
µ =0.08-0.50
µ
0
=0.12-0.35
µ =0.04-0.25
Wood on steel
Static friction (dry)
Sliding friction (dry)
µ
0
=0.45-0.75
µ =0.30-0.60
Wood on wood
Static friction (dry)
Sliding friction (dry)
µ
0
=0.40-0.75
µ =0.30-0.50
Plastic belt on steel
Static friction (dry)
Sliding friction (dry)
µ
0
=0.25-0.45
µ =0,25
Steel on plastic
Static friction (dry)
Sliding friction (dry)
µ
0
=0.20-0.45
µ =0.18-0.35
Table 7.21 Coefficients of friction of various material pairings
Material pairing Lever arm of rolling friction
Steel on steel f=0.5 mm
Wood on steel (roller conveyor) f=1,2 mm
Plastic on steel f=2.0 mm
Hard rubber on steel f=7.0 mm
Plastic on concrete f=5.0 mm
Hard rubber on concrete f=10 mm - 20 mm
Medium-hard rubber on concrete f=15 mm - 35 mm
Table 7. 22 Lever ar m of rolling fr iction for va ri o u s material pairings
Aluminum 2700 kg/m³
Gray-cast 7600 kg/m³
Copper 8960 kg/m³
Brass 8400-8900 kg/m³
Steel 7860 kg/m³
Zinc 7130 kg/m³
Table 7.23 Density of various materials
To Next Page
Loading...
