Coeffients of Friction [PDF]

Zitiervorschau

Coefficient of Friction Equation and Table Chart - Engineers Edge

Page 1 of 4

Search

Coefficient of Friction Equation and Table Chart

Welded Steel Tubing Various applications Tubing Contact us for Details!

Front Page Engineering Store Engineering Forum Engineering News Engineering Videos Engineering Calculators Site Directory Engineering Jobs GD&T Geometric Dimensioning Tolerancing Training DFM DFA Training Advertising Center

Design Resources | Friction Design Data The frictional force for Static Friction can be expressed as: Fmax= μ Fn where Fmax= Frictional force (N, lb) μ = static (μ s ) or kinetic (μ k ) frictional coefficient Fn = Applied Normal force (N, lb) The frictional force for Dynamic Friction can be expressed as: For an object pulled or pushed horizontally, the normal force - N - is simply the weight :

2

Share | N=mg Print Webpage

Where:

Copyright Notice

m = Mass (kg, slugs ) g = Gravity (9.81 m/s2 , 32 ft/s2) Static Coefficient of Friction Material

Against Material

Dry Contact

Lubricated Contact

Aluminum

Aluminum

1.10 -1.35

.30

Aluminum-Bronze Alloy

Steel

.46

-

Aluminum

Steel

.61

-

Brake (Composite)

Cast Iron

.40

.21 (wet)

Brass

Steel

.50

.19

Brass

Cast Iron

.28

Brick

Wood

.60

-

Bronze

Cast Iron

.21

-

Bronze Sintered

Steel

-

Bronze

Steel

.12 .16

Cadmium

Cadmium

.50

.05

Cadmium

Chromium (Chrome)

.40

.35

Cadmium

Steel, Mild

.46

Carbon

Carbon

.15

.12 - .14

Carbon

Steel

.14

.12 - .14

Cast Iron

Cast Iron

1.1

.08

Cast Iron

Copper

1.05

-

Cast Iron

Oak Wood

.485

.08

Cast Iron

Steel

.40

.21

Cast Iron

Zinc

.85

-

Chromium (Chrome)

Chromium (Chrome)

.41

.34

Colbalt (70°C)

Cobalt

.3

-

Concrete

Rubber

1.0

.30 (wet)

Concrete

Wood

.62

-

Copper

Cast Iron

1.05

-

Copper

Copper

1.00

.08

Copper

Glass

.94

-

Copper

Steel

.53

Copper-Lead Alloy

Steel

.22

-

Cork

Iron

.35

-

http://www.engineersedge.com/coeffients_of_friction.htm

09.04.2015

Coefficient of Friction Equation and Table Chart - Engineers Edge

Page 2 of 4

Diamond

Diamond

.10

Diamond

Metal

.10 - .15

.05 - .10 .10

Glass

Glass

.90 - 1.0

.10 - .60

Glass

Metal

.50 - .70

.20 - .30

Glass

Nickel

.78

.57

Graphite

Graphite

.10

.10

Graphite

Steel

.1

.1

Horseshoe

Concrete

.67

-

Horseshoe

Rubber

.28

-

Ice

Wood

.05

-

Ice

Steel

.04

-

Iron

Iron

1.0

.15 -. .20 -

Lead

Cast Iron

.41

Leather

Iron

.3

Leather

Wood

.30 - .40

-

Leather

Metal

.60

-

Leather (Greasy)

Iron

.2 - .25

Magnesium

Magnesium

.60

Masonry

Brick

.65

-

Nickel

Nickel

.70

.28

Nylon

Nylon

.15 - .25

-

.079

Oak

Oak

.61

-

Paper

Cast Iron

.19

-

Phosphor Bronze

Steel

.35

-

Platinum

Platinum

1.20

.25

Plexiglas

Plexiglas

.80

.80

Plexiglas

Steel

.40 - .50

.40 - .50

Polyethene

Steel

.2

.2

Polystyrene

Polystyrene

.50

.50

Polystyrene

Steel

.30 - .35

.30 - .35

Rubber

Rubber

1.15

-

Rubber

Asphalt

.9

-

Rubber

Concrete

.6

Rubber (60 A Belt)

Stainless Steel 316

.64

-

Rubber (60 A Belt)

Rubber (40 A Belt)

.62

-

Rubber (60 A Belt)

Rubber (60 A Belt)

.73

-

Rubber (60 A Belt)

Tool Steel

.86

-

Rubber (60 A Belt)

Tungsten Carbide

.62

-

Rubber (60 A Belt)

UHMW

.56

-

Rubber (60 A Belt)

Urethane 50

.60

-

Rubber (60 A Belt)

Urethane 80A

.70

-

Rubber (60 A Belt)

Urethane

.67

-

Silver

Silver

1.40

.52

Skin, Human

Metals (63 Ra)

.9

-

Steel

Steel

.80

.16

Teflon

Steel

.04

.04

Teflon

Teflon

.05 - .20

.04

Tin

Cast Iron

.31

-

Tire, Rubber

Asphalt

.71

-

Tire, Rubber

Grass

.36

-

Tungsten Carbide

Steel

.40 - .60

.10 - .20

Tungsten Carbide

Tungsten Carbide

.20 - .25

.12

Wood

Wood

.25 - .50

.20

Wood

Metals

.20 - .60

.20 (wet)

Zinc

Zinc

.60

.04

Static friction is friction between two or more solid objects that are not moving relative to each other. For example, static friction can prevent an object from

http://www.engineersedge.com/coeffients_of_friction.htm

09.04.2015

Coefficient of Friction Equation and Table Chart - Engineers Edge

Page 3 of 4

sliding down a sloped surface. The coefficient of static friction, typically denoted as μs , is usually higher than the coefficient of kinetic friction.

Material Aluminum on aluminum Canvas belt on rubber lagging Canvas belt, stitched, on steel Canvas belt, woven, on steel Cast iron on asbestos, fabric brake material Cast iron on brass Cast iron on bronze Cast iron on cast iron Cast iron on copper Cast iron on lead Cast iron on leather Cast iron on oak (parallel) Cast iron on magnesium Cast iron on steel, mild Cast iron on tin Cast iron on zinc Earth on earth Glass on glass Hemp rope on wood Nickel on nickel Oak on leather (parallel) Oak on oak (parallel) Oak on oak (perpendicular) Rubber tire on pavement Steel on ice Steel, hard, on babbit Steel, hard, on steel, hard Steel, mild, on aluminum Steel, mild, on brass Steel, mild, on bronze Steel, mild, on copper Steel, mild, on steel, mild Stone masonry on concrete Stone masonry on ground Wrought iron in bronze Wrought iron on wrought iron

Sliding Dry Lubricated 0.20 0.10 0.22 0.10 0.35-0.40 0.30 0.22 0.07-0.08 0.15 0.06-0.10 0.29 0.43 0.13-0.36 0.07-0.20 0.30-0.50 0.25 0.133 0.23 0.32 0.21 0.40 0.40-0.70 0.53 0.12 0.30-0.50 0.48 0.16 0.32 0.07 0.75-0.85 0.5-0.7* 0.01 0.33-0.35 0.05-0.16 0.42 0.03-0.12 0.47 0.44 0.34 0.17 0.36 0.18 0.57 0.09-0.19 0.18 … 0.44 0.08-0.10

All Types of WIRE wires.co.uk

Wire in All Metals and Coverings Knitted WIRE Tel 013712 38013

Import Aluminum Products Nonferrous Metal Products Stainless Steel Bar Stainless Steel Pipe Special Steel Profiles Lubrication & Wear Stainless steel balls Quest 4 Alloys Ltd Carbon Steel Pipes

http://www.engineersedge.com/coeffients_of_friction.htm

09.04.2015

Coefficient of Friction Equation and Table Chart - Engineers Edge

Page 4 of 4

© Copyright 2000 - 2015, by Engineers Edge, LLC www.engineersedge.com All rights reserved Disclaimer | Feed Back | Advertising | Contact

http://www.engineersedge.com/coeffients_of_friction.htm

09.04.2015