Appendix E: Properties of Engineering
Materials
E.1 Friction and Thermal Expansion Coefficients
Friction coefficients may vary for as much as 100% for seemingly identical conditions. The values given are thus only indicative of the magnitude to expect
(Tables E.1, E.2 and E.3).
E.2 Density and Elasticity Constants
Table E.1 Coefficients of friction
1
Contacting surface
Static, l s
Kinetic, l k
Brake lining on cast iron
0.4
0.3
Brass on ice (0 °C)
–
0.02
Brass on steel (dry)
0.5
0.4
Glass on glass
0.9–1.0
–
Metal on ice
–
0.02
Steel on steel (dry)
0.6
0.4
Steel on steel (greasy)
0.1
0.05
Teflon on steel
0.04
0.04
Wood on wood
0.25–0.5
–
Ceramics on ceramics
0.05–0.5
Metal or ceramic on polymer
0.04–0.5
Polymer on polymer
0.05–1.0
Steel on ceramics
0.1–0.5
1
Ashby and Jones (1991), Meriam and Kraige (1998), Weast
(1981)
© The Editor(s) (if applicable) and The Author(s), under exclusive license to
Springer Nature Switzerland AG 2021
J. J. Thomsen Vibrations and Stability,
https://doi.org/10.1007/978-3-030-68045-9
495
Materials
E.1 Friction and Thermal Expansion Coefficients
Friction coefficients may vary for as much as 100% for seemingly identical conditions. The values given are thus only indicative of the magnitude to expect
(Tables E.1, E.2 and E.3).
E.2 Density and Elasticity Constants
Table E.1 Coefficients of friction
1
Contacting surface
Static, l s
Kinetic, l k
Brake lining on cast iron
0.4
0.3
Brass on ice (0 °C)
–
0.02
Brass on steel (dry)
0.5
0.4
Glass on glass
0.9–1.0
–
Metal on ice
–
0.02
Steel on steel (dry)
0.6
0.4
Steel on steel (greasy)
0.1
0.05
Teflon on steel
0.04
0.04
Wood on wood
0.25–0.5
–
Ceramics on ceramics
0.05–0.5
Metal or ceramic on polymer
0.04–0.5
Polymer on polymer
0.05–1.0
Steel on ceramics
0.1–0.5
1
Ashby and Jones (1991), Meriam and Kraige (1998), Weast
(1981)
© The Editor(s) (if applicable) and The Author(s), under exclusive license to
Springer Nature Switzerland AG 2021
J. J. Thomsen Vibrations and Stability,
https://doi.org/10.1007/978-3-030-68045-9
495