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Book Chapter

By Kylie E. Van Meter, Brandon A. Krick
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006911
EISBN: 978-1-62708-395-9
... Abstract Tribology is the study of contacting materials in relative motion and more specifically the study of friction, wear, and lubrication. This article discusses the classification and the mechanisms of friction, wear, and lubrication of polymers. It describes the tribological applications...
Book Chapter

Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0092102
EISBN: 978-1-62708-234-1
... (frictional wear). No recommendations were made. Gears Lubrication Nylon (Other, miscellaneous, or unspecified) wear Figure 1 shows pitting on the tooth flank of a nylon oil-lubricated driving gear. The pitting produced numerous surface microcracks in association with large-scale fragmentation...
Book Chapter

Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0009190
EISBN: 978-1-62708-225-9
... the consideration and control of many interrelated factors. Bending fatigue Gear boxes Helical gears Lubrication Scuffing Carburized steel Fatigue fracture Abrasive wear In an industrial application, 24 speed-increaser gearboxes were used to transmit 258 kW (346 hp) and increase speed from 55...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001846
EISBN: 978-1-62708-241-9
...-cycle rotation-bending fatigue. The bearing sleeve failed as a result of abrasive and adhesive wear. Detailed metallurgical analysis indicated that the sleeve and its respective journal had been subjected to abnormally high temperatures, increasing the amount of friction between the sleeve, bearing bush...
Book Chapter

Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.homegoods.c0048536
EISBN: 978-1-62708-222-8
... mode of loading. Nevertheless, the fracture surface of the failure-causing crack suggested a tensile-stress component was involved in driving failure. Frictional wear Microcracking Rubber Brittle fracture A brittlelike crack propagation caused failure in a rubber office-chair roller...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001847
EISBN: 978-1-62708-241-9
... underneath. This led to further wear and an increase in friction between the sleeve and bearing bush. Fatigue crack initiation occurred at the root fillet because of stress concentration and large frictional forces. Insufficient nitriding depth facilitated the propagation of fatigue cracks. bearing...
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Published: 01 January 2002
Fig. 6 Classification of the processes of friction leading to wear for elastomers (adapted after Moore, Ref 23 ). The diagram clarifies the role of friction in determining the wear mechanism for elastomeric polymers. More
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Published: 01 January 2002
Fig. 11 Influence of fillers on friction and wear behavior of PEEK composites; L , Normal load, 196 N; speed 0.445 m/s; counterface plain carbon steel ring. (a) nanometer-sized SiC in PEEK; (b), and (c) PTFE in PEEK and PEEK + SiC (3.3 vol% constant) composites. Source: Ref 40 More
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Published: 01 January 2002
Fig. 12 (a) Influence of PTFE on friction and wear performance of PEEK composites and the optimum range of PTFE amount for best combination of μ and K 0 . (b) Linear correlation and synergistic effect as a result of two opposite trends. K 0,M and K 0,L represent specific wear rates More
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Published: 01 January 2002
Fig. 17 Specific wear rate and friction coefficient of unidirectional composites (see Table 4 ) in three orientations ( P , 1.5 N/mm 2 ; V , 0.83 m/s; distance slid, 16 km). More
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Published: 01 January 2002
Fig. 25 Effect of atmospheric pressure on the friction and wear of a carbon steel cylinder More
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Published: 15 January 2021
Fig. 13 Comparison between (a) Archard approach and (b) friction energy wear approach to quantify the wear evolution of a sintered steel displaying a significant fluctuation of the friction coefficient, depending on the loading condition. Adapted from Ref 42 More
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Published: 15 January 2021
Fig. 33 Effect of atmospheric pressure on the friction and wear of a carbon steel cylinder. Adapted from Ref 107 More
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Published: 15 May 2022
Fig. 5 Classification of the processes of friction leading to wear for elastomers. The diagram clarifies the role of friction in determining the wear mechanism for elastomeric polymers. Adapted from Ref 22 More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001533
EISBN: 978-1-62708-225-9
... consists of a number of parallel wear furrows, which are characteristic of metal wear. 1 , 2 The presence of large reoriented areas that can in the process of friction form cracks and crumble is remarkable. Individual cracks were observed to be located across the friction furrows of a worn-out surface...
Book Chapter

By Sujeet K. Sinha
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003571
EISBN: 978-1-62708-180-1
... sliding pair, except in few instances, usually produces undesirable high friction and high wear conditions due to enhanced adhesion between the polymer. Also, poor conductivity of the polymers results in elevated temperature at the polymer/polymer interface, leading to melting and rapid wear. Therefore...
Book Chapter

By Giovanni Straffelini
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006789
EISBN: 978-1-62708-295-2
... in designing as well as in failure analysis for explaining the possible reasons of a given wear failure and thus adopting the most suitable countermeasures. It is also fundamental in basic research to help focus toward the goals, such as the reduction of wear rate or the optimization of friction. Wear...
Book Chapter

By Gaurav Nagalia
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006850
EISBN: 978-1-62708-395-9
... in tribological applications are subjected to sliding against hard surfaces such as metals. A polymer–polymer sliding pair, except in few instances, usually produces undesirable high friction and high wear conditions due to enhanced adhesion between the polymers. Also, poor conductivity of the polymers results...
Book Chapter

By Bojan Podgornik
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006791
EISBN: 978-1-62708-295-2
... Abstract Friction and wear are important when considering the operation and efficiency of components and mechanical systems. Among the different types and mechanisms of wear, adhesive wear is very serious. Adhesion results in a high coefficient of friction as well as in serious damage...
Book Chapter

By Siegfried Fouvry
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006829
EISBN: 978-1-62708-295-2
... loop, the friction energy, E d (J) (i.e., friction work), inputted in the interface can be estimated. Both E d (J) and δ S variables can be considered to quantify the wear rate. Fretting Sliding Condition Most of the research work and industrial feedback emphasize that fretting damage...