Fundamentals of tribology:
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| Main Authors: | , |
|---|---|
| Format: | Book |
| Language: | English |
| Published: |
London
Imperial College Press
2008
|
| Subjects: | |
| Online Access: | Inhaltsverzeichnis Klappentext |
| Item Description: | Includes bibliographical references and index |
| Physical Description: | XXVI, 391 S. Ill., graph. Darst. |
| ISBN: | 9781848161849 1848161840 |
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| 020 | |a 9781848161849 |9 978-1-84816-184-9 | ||
| 020 | |a 1848161840 |9 1-84816-184-0 | ||
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| 100 | 1 | |a Gohar, Ramsey |e Verfasser |4 aut | |
| 245 | 1 | 0 | |a Fundamentals of tribology |c R. Gohar ; H. Rahnejat |
| 264 | 1 | |a London |b Imperial College Press |c 2008 | |
| 300 | |a XXVI, 391 S. |b Ill., graph. Darst. | ||
| 336 | |b txt |2 rdacontent | ||
| 337 | |b n |2 rdamedia | ||
| 338 | |b nc |2 rdacarrier | ||
| 500 | |a Includes bibliographical references and index | ||
| 650 | 4 | |a Tribology | |
| 650 | 0 | 7 | |a Tribologie |0 (DE-588)4060847-5 |2 gnd |9 rswk-swf |
| 689 | 0 | 0 | |a Tribologie |0 (DE-588)4060847-5 |D s |
| 689 | 0 | |5 DE-604 | |
| 700 | 1 | |a Rahnejat, Homer |e Verfasser |4 aut | |
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| 856 | 4 | 2 | |m Digitalisierung UB Bayreuth |q application/pdf |u http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=017101816&sequence=000004&line_number=0002&func_code=DB_RECORDS&service_type=MEDIA |3 Klappentext |
| 999 | |a oai:aleph.bib-bvb.de:BVB01-017101816 | ||
Record in the Search Index
| _version_ | 1804138595597942784 |
|---|---|
| adam_text | CONTENTS
Preface
v
Notation ix
1.
Introduction
to Tribology
1
1.1.
Introduction
........................ 1
1.2.
Regimes of Lubrication
.................. 4
1.3.
Layout of the Book
.................... 6
References
............................. 7
2.
The Nature of Rough Surfaces
9
2.1.
Introduction
........................ 9
2.2.
Surface Roughness
.................... 10
2.3.
Measurement of Surface Texture
............. 10
2.4.
Types of Engineering Surface
.............. 12
2.5.
Mathematical Representation of Surface Features
. . . 13
2.5.1.
Analogue solutions
............... 13
2.5.2.
Discrete
int
erval solutions of profile height,
. . 17
2.5.3.
Statistical representation of surface texture
. 17
2.6.
Worked Example
..................... 20
2.7.
Closure
........................... 21
References
............................. 21
3.
Elastic Solids in Normal Contact
23
3.1.
Introduction
........................ 23
3.2.
Deformation Characteristics
............... 23
3.3.
Surface Deformation in a Spherical Contact
...... 29
3.4.
Various Contact Geometries
............... 32
3.4.1.
Line or circular footprint contacts
....... 32
3.4.2.
Elliptical footprint contacts
.......... 33
xx
Fundamentals of Tribology
3.4.3.
Worked Example
(1).............. 33
3.5.
Onset of Yield
....................... 35
3.5.1.
Cylindrical surfaces
............... 35
3.5.2.
Spherical surfaces
................ 37
3.6.
Nominally Flat Rough Surfaces in Contact
....... 38
3.6.1.
Idealized rough surfaces
............ 38
3.6.2.
Contact between real rough surfaces
..... 40
3.6.3.
Plasticity index
................. 43
3.6.4.
Fully plastic surface contacts
......... 44
3.6.5.
Worked Example
(2).............. 46
3.7.
Contact Between Curved Rough Surfaces
........ 46
3.8.
Hertzian Impact
...................... 47
3.9.
Closure
........................... 48
Appendices
............................. 50
References
............................. 50
4.
Dry Friction and Wear
51
4.1.
Introduction
........................ 51
4.2.
The Basic Mechanisms of Dry Friction
......... 54
4.2.1.
Adhesion and deformation
........... 54
4.2.2.
Adhesive friction
................ 55
4.2.2.1.
Influence of contaminant films
. ... 59
4.2.3.
Deformation friction
.............. 60
4.2.3.1.
The ploughing component of
deformation friction
......... 61
4.2.4.
Elastic rolling friction
............. 62
4.2.5.
Tractive rolling of an elastic cylinder
..... 64
4.2.6.
Creep ratio
................... 66
4.2.7.
Other examples of rolling motion
....... 66
4.3.
Thermal Effects of a Frictional Temperature Rise in
Concentrated Contacts
.................. 67
4.4.
Wear of Surfaces
..................... 68
4.4.1.
Adhesive wear
.................. 69
4.4.2.
Abrasive wear
.................. 71
4.4.3.
Macroscopic fatigue wear
........... 72
4.4.4.
Microscopic sliding fatigue wear
........ 73
4.4.5.
Corrosive wear
................. 74
4.4.6.
Fretting corrosion
................ 74
Contents xxi
4.5.
Closure
........................... 75
References
............................. 75
5.
Lubricant Properties
77
5.1.
Introduction
........................ 77
5.2.
Dynamic Viscosity
.................... 77
5.3.
Effect of Temperature on Viscosity
........... 79
5.4.
The American Society for Testing Materials
(A.S.T.M.) Chart
..................... 80
5.5.
Viscosity Index of Lubricants (VI)
............ 80
5.6.
Polymer Thickened Oils
................. 81
5.7.
Blends of Oils
....................... 82
5.8.
Grades of Oil
....................... 83
5.9.
Effect of
Pressure on
Viscosity
.............. 83
5.10.
Lubricant Density
..................... 85
5.11.
Effect of Shear Rate on Viscosity
............
8(j
5.12.
Worked Example
.....................
8(i
5.13.
Closure
........................... 88
References
............................. 88
6.
The Reynolds and Energy Equations
89
Ü.I.
Introduction
........................ 89
6.2.
Reynolds Equation
.................... 89
6.3.
Reynolds Equation by Dimensional Analysis
...... 91
6.4.
Derivation of Reynolds Equation in Three Dimensions
91
6.4.1.
Equilibrium of forces on a lubricant clement
. 95
6.4.2.
Velocity
distribuí
ion
.............. 90
6.4.3.
Mass continuity
................. 97
6.5.
Simplifications of Reynolds Equation
.......... !)!)
6.5.1.
Long bearing
.................. 100
6.5.2.
Long bearing approximation for rigid cylinders
101
6.5.3.
Line contact pressure distribution
....... 101
6.5.4.
Line contact load
................ 104
6.5.5.
Narrow bearings
................ 105
6.5.6.
Squeeze film bearings
.............. 100
6.6.
Rolling Contacts
..................... 106
6.7.
The Energy Equation
................... 107
6.7.1.
Significance of terms in the energy equation
. 108
6.7.2.
Convected heat only
.............. 10!)
xxii
Fundamentals of Tribology
6.7.3.
Conducted heat only
.............. 109
6.7.4.
Heat flow ratio
................. 110
6.8.
Closure
........................... 110
References
.............................
Ill
7.
Thrust Bearings
113
7.1.
Introduction
........................ 113
7.2.
Analysis of Thrust Bearings
............... 114
7.2.1.
Geometry
.................... 114
7.2.2.
Pressure distribution
.............. 114
7.2.3.
Load capacity
.................. 116
7.2.4.
Pivot point location
.............. 117
7.2.5.
Friction force
.................. 120
7.2.6.
Mass flow
.................... 121
7.2.7.
Temperature effect
............... 122
7.2.8.
Effective temperature
............. 124
7.3.
Finite Length Plane Thrust Bearings
.......... 125
7.3.1.
Introduction
................... 125
7.3.2.
Thermal design of finite length bearings
. . . 125
7.3.3.
Power balance for the effective viscosity
. . . 126
7.3.4.
Effective temperature design coefficients
. . . 127
7.4.
Examples of Thermal Design
............... 128
7.4.1.
Long hearing
.................. 128
7.4.2.
Finite length hearing
.............. 130
7.5.
Other Thrust Bearing Geometries
............ 132
7.5.1.
The taper land bearing
............. 133
7.5.2.
The Raleigh step bearing
........... 133
7.5.3.
The pocket step bearing
............ 135
7.6.
Closure
........................... 135
Appendices
............................. 136
References
............................. 136
8.
Journal Bearings
139
8.1.
Introduction
........................ 139
8.2.
Film Geometry
...................... 139
8.3.
The Pressure Equation for a Narrow Bearing
...... 140
8.4.
Load
............................ 142
8.5.
Attitude Angle
...................... 144
8.6.
Lubricant Flow
...................... 145
Conteras
ххШ
8.6.1.
Side flow from hydrodynamic action
..... 145
8.6.2.
Pressurized flow from a single supply hole
. . 145
8.6.3.
Total pump delivery flow
............ 146
8.6.4.
Double
180°
journal bearings
......... 147
8.6.5.
Circumferential groove bearings
........ 148
8.7.
Friction in Journal Bearings
............... 148
8.7.1.
Effect of the Reynolds boundary condition
on friction
.................... 150
8.7.2.
Coefficient of friction
.............. 151
8.8.
Thermal Design of Journal Bearings
........... 151
8.8.1.
Introduction
................... 151
8.8.2.
Finding the effective viscosity
......... 152
8.8.3.
Design example (Some of the data in this
example is taken from
Ref. 5)......... 154
8.9.
Mass Unbalance in Rotors
................ 155
8.9.1.
Natural frequency of journal bearings
..... 157
8.9.2.
Half speed cylindrical whirl of journal bearings
150
8.9.3.
Natural frequency of the complete rotor/
bearing system
.................
НП
8.10.
Journal Bearings with Periodic and Rotating Loads
. . 161
8.11.
Closure
........................... N¡1
Appendices
.............................
1G2
References
.............................
HU
9.
Externally Pressurized (EP) Bearings
165
9.1.
Introduction
........................
1(>Г)
3.2.
Some Applications of
EP
Bearings
............
Hifi
9.3.
Principles of Hydrostatic Bearings
............
1(1(i
9.3.1.
Optimization
..................
1(i!)
9.3.2.
Stiffness
.....................
1(i!)
9.3.3.
Compensators
..................
9.3.4.
Worked Example
1...............
17:i
9.4.
Principles of Aerostatic Bearings
............
i7J
9.4.1.
Introduction
...................
l J
9.4.2.
Flow through the gas film
...........
^4
9.4.3.
Gas flow through the feed hole
........
^
9.4.4.
Matching the gas flows
.............
llJ
9.4.5.
Aerostatic gas bearing load capacity
.....
l^·1
9.4.6.
Aerostatic bearing
Ніш
stiffness
........
li!)
xxiv
Fundamentals of Tribology
9.4.7.
Worked Example
2............... 181
9.4.8.
Aerostatic journal bearings
.......... 182
9.4.9.
Aerostatic journal bearing instability
..... 183
9.5.
Closure
........................... 184
References
............................. 184
10.
Elastohydrodynamic Lubrication (EHL)
185
10.1.
Introduction
........................ 185
10.2.
Principles of EHL
..................... 185
10.3.
Reynolds Equation Under Piezoviscous Conditions
. . 188
10.4.
Discussion on EHL Line Contact Film Shape
...... 192
10.5.
Circular Footprint EHL Contacts
............ 192
10.6.
Numerical Predictions
.................. 192
10.7.
Computer Solution
.................... 195
10.8.
Experimental Methods
.................. 196
10.8.1.
Optical
interferometry
............. 196
10.9.
Results from Numerical Solutions
............ 200
10.9.1.
Regimes of concentrated contact lubrication
. 200
10.9.2.
Concentrated contact numerical solution
relationships
................... 201
Worked Example
10.1....................... 203
10.10.
Friction Forces in EHL Contacts
............. 205
10.10.1.
A viscoelastic model of the oil behavior
. . . 205
10.10.2.
Limiting shear stress
.............. 207
10.10.3.
Regimes of traction
............... 209
10.10.4.
Determination of the friction coefficient
. . . 209
10.11.
Rough Surface EHL
.................... 213
10.12.
Closure
........................... 215
References
............................. 215
11.
Fatigue Life of Rolling Element Bearings
217
11.1.
Introduction
........................ 217
11.2.
Failure Stress Hypotheses
................ 219
11.2.1.
Asperity stress field
............... 219
11.2.2.
Subsurface stress field
............. 219
11.3.
Fatigue Life Dispersion
.................. 220
11.4.
Effect of Load on Fatigue Life
.............. 225
11.5.
Effect of
ĽHL
on Fatigue Life
.............. 225
11.0.
A Unified Life Model
................... 226
Contents xxv
11.7.
Closure
........................... 227
References
............................. 227
12.
Transient Elastohydrodynamic Lubrication
229
12.1.
Introduction
........................ 229
12.2.
A Valve Train System
................... 230
12.2.1.
An example
................... 239
12.3.
EHL of Thin Shell Journal Bearings
........... 243
12.4.
Transient EHL of Piston-to-Cylindcr Liner
....... 249
12.5.
Closure
........................... 262
References
............................. 203
13.
Nano-Tribology
265
13.1.
Introduction
........................ 265
13.2.
Important Forces in Nano-Tribology
.......... 268
13.3.
Van
der Waals
Forces
................... 269
13.3.1.
Concluding remarks on Van
der Waals
forces
270
13.4.
Electrostatic Forces
.................... 271
13.4.1.
An example
................... 274
13.5.
Meniscus/Surface Tension Force
............. 277
13.5.1.
An example
................... 292
13.6.
Solvation Effect
...................... 293
13.6.1.
An example
................... 297
13.7.
Mechanisms of Friction in Nano-Conjunetions
..... 299
13.7.1.
An example
................... 304
References
............................. 307
14.
Bio-Tribology
309
14.1.
Introduction
........................ 309
14.2.
Tribology in the Animal World
............. 310
14.2.1.
Allometry
.................... 310
14.2.2.
Forces and stresses
............... 311
14.3.
Attachment and Locomotion of Small Animals
on Smooth Surfaces
.................... 311
14.4.
Natural Human
Synovial
Joints
............. 315
14.4.1.
Measurement of friction
............. 310
14.4.2.
Lubrication of
synovial
joints
......... 317
14.4.3.
Analysis of fluid-film lubrication in joints
. . 317
xxvi
Fundamentals of Tribology
14.4.4.
Evidence of boundary lubrication
in
synovial
joints
................ 320
14.4.5.
Overall view of human joint lubrication
. . . 321
14.5.
Total Joint Replacements
................. 321
14.5.1.
The hip
..................... 322
14.5.2.
Metal-on-metal total hip replacements
.... 324
14.5.3.
Alternative material pairs
........... 326
14.6.
Further Examples of Bio-Tribology
........... 327
14.6.1.
Skin
....................... 327
14.6.2.
Hair
....................... 328
14.6.3.
Shaving
..................... 328
14.6.4.
Teeth
...................... 329
14.7.
Closure
........................... 329
References
............................. 330
Questions
333
Book of Solutions
355
Index
387
There are many occasions when quick solutions to problems
in tribology are needed. For example, an understanding of the
lubrication mechanism in a racing car engine has led to an
improvement in performance. Why does a woman s face cream
make her look younger for a time? Tribologists are frequently
summoned in legal cases as expert witnesses after people have
slipped in public places. Improvements to the human artificial
hip joint are also partly a result of extensive tribology research
In order to solve such problems, tribology should be regarded
as an important undergraduate course. This book covers tribology
in such a way as to provide simple approximate solutions to
frequent practical problems. Unlike previous books, which catered
for earlier generations of undergraduates, today s students
generally have sophisticated computer systems available in
their colleges. Therefore, many of the worked and set examples
in the book are made easier by using readily available software
such as Math CAD. Readers will thus gain practice in using it.
and will benefit in general by understanding the mathematical
principles involved in the solutions. This book is particularly
useful to engineering undergraduates and practicing engineers
needing a quick solution to tribological problems.
|
| any_adam_object | 1 |
| author | Gohar, Ramsey Rahnejat, Homer |
| author_facet | Gohar, Ramsey Rahnejat, Homer |
| author_role | aut aut |
| author_sort | Gohar, Ramsey |
| author_variant | r g rg h r hr |
| building | Verbundindex |
| bvnumber | BV035296879 |
| callnumber-first | T - Technology |
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| dewey-ones | 621 - Applied physics |
| dewey-raw | 621.89 |
| dewey-search | 621.89 |
| dewey-sort | 3621.89 |
| dewey-tens | 620 - Engineering and allied operations |
| discipline | Maschinenbau / Maschinenwesen Maschinenbau |
| format | Book |
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| id | DE-604.BV035296879 |
| illustrated | Illustrated |
| indexdate | 2024-07-09T21:30:41Z |
| institution | BVB |
| isbn | 9781848161849 1848161840 |
| language | English |
| oai_aleph_id | oai:aleph.bib-bvb.de:BVB01-017101816 |
| oclc_num | 228372588 |
| open_access_boolean | |
| owner | DE-703 DE-29T DE-91G DE-BY-TUM |
| owner_facet | DE-703 DE-29T DE-91G DE-BY-TUM |
| physical | XXVI, 391 S. Ill., graph. Darst. |
| publishDate | 2008 |
| publishDateSearch | 2008 |
| publishDateSort | 2008 |
| publisher | Imperial College Press |
| record_format | marc |
| spelling | Gohar, Ramsey Verfasser aut Fundamentals of tribology R. Gohar ; H. Rahnejat London Imperial College Press 2008 XXVI, 391 S. Ill., graph. Darst. txt rdacontent n rdamedia nc rdacarrier Includes bibliographical references and index Tribology Tribologie (DE-588)4060847-5 gnd rswk-swf Tribologie (DE-588)4060847-5 s DE-604 Rahnejat, Homer Verfasser aut Digitalisierung UB Bayreuth application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=017101816&sequence=000003&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis Digitalisierung UB Bayreuth application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=017101816&sequence=000004&line_number=0002&func_code=DB_RECORDS&service_type=MEDIA Klappentext |
| spellingShingle | Gohar, Ramsey Rahnejat, Homer Fundamentals of tribology Tribology Tribologie (DE-588)4060847-5 gnd |
| subject_GND | (DE-588)4060847-5 |
| title | Fundamentals of tribology |
| title_auth | Fundamentals of tribology |
| title_exact_search | Fundamentals of tribology |
| title_full | Fundamentals of tribology R. Gohar ; H. Rahnejat |
| title_fullStr | Fundamentals of tribology R. Gohar ; H. Rahnejat |
| title_full_unstemmed | Fundamentals of tribology R. Gohar ; H. Rahnejat |
| title_short | Fundamentals of tribology |
| title_sort | fundamentals of tribology |
| topic | Tribology Tribologie (DE-588)4060847-5 gnd |
| topic_facet | Tribology Tribologie |
| url | http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=017101816&sequence=000003&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=017101816&sequence=000004&line_number=0002&func_code=DB_RECORDS&service_type=MEDIA |
| work_keys_str_mv | AT goharramsey fundamentalsoftribology AT rahnejathomer fundamentalsoftribology |