More actions
Bot: Automatski unos stranica |
m Bot: Automatska zamjena teksta (-{{cite web +{{Citiranje weba) |
||
| Redak 17: | Redak 17: | ||
| 0,61 | | 0,61 | ||
| | | | ||
| 0,47 <ref name=roymech>{{ | | 0,47 <ref name=roymech>{{Citiranje weba | ||
| url = http://www.roymech.co.uk/Useful_Tables/Tribology/co_of_frict.htm#method | | url = http://www.roymech.co.uk/Useful_Tables/Tribology/co_of_frict.htm#method | ||
| title = Friction Factors - Coefficients of Friction | | title = Friction Factors - Coefficients of Friction | ||
| Redak 28: | Redak 28: | ||
| | | | ||
| | | | ||
| 0,004 (mokro)<ref name=ULFC>{{ | | 0,004 (mokro)<ref name=ULFC>{{Citiranje weba | ||
| url = http://www.sciencedirect.com/science/article/pii/S0043164812002736 | | url = http://www.sciencedirect.com/science/article/pii/S0043164812002736 | ||
| title = Ultra-low friction coefficient in alumina–silicon nitride pair lubricated with water | | title = Ultra-low friction coefficient in alumina–silicon nitride pair lubricated with water | ||
| Redak 42: | Redak 42: | ||
| last6=Cook|first6=B. A. | | last6=Cook|first6=B. A. | ||
| journal=Applied Physics Letters|volume=83|issue=14|pages=2781|bibcode = 2003ApPhL..83.2781T }}</ref> | | journal=Applied Physics Letters|volume=83|issue=14|pages=2781|bibcode = 2003ApPhL..83.2781T }}</ref> | ||
| 0,02 <ref name=ULFC3>{{ | | 0,02 <ref name=ULFC3>{{Citiranje weba | ||
| url = http://www.newscientist.com/article/dn16102-material-slicker-than-teflon-discovered-by-accident.html | | url = http://www.newscientist.com/article/dn16102-material-slicker-than-teflon-discovered-by-accident.html | ||
| title = Material slicker than Teflon discovered by accident | | title = Material slicker than Teflon discovered by accident | ||
| Redak 115: | Redak 115: | ||
! [[Hrskavica]] | ! [[Hrskavica]] | ||
| | | | ||
| 0,01 <ref name = synovial>{{ | | 0,01 <ref name = synovial>{{Citiranje weba | ||
| url = http://hypertextbook.com/facts/2007/ConnieQiu.shtml | | url = http://hypertextbook.com/facts/2007/ConnieQiu.shtml | ||
| title = Coefficients of Friction of Human Joints | | title = Coefficients of Friction of Human Joints | ||
| Redak 138: | Redak 138: | ||
! [[PTFE]] (teflon) | ! [[PTFE]] (teflon) | ||
! PTFE (teflon) | ! PTFE (teflon) | ||
| 0,04<ref name=roymech/><ref name=eng>{{ | | 0,04<ref name=roymech/><ref name=eng>{{Citiranje weba | ||
| url = http://www.engineeringtoolbox.com/friction-coefficients-d_778.html | | url = http://www.engineeringtoolbox.com/friction-coefficients-d_778.html | ||
| title = The Engineering Toolbox: Friction and Coefficients of Friction | | title = The Engineering Toolbox: Friction and Coefficients of Friction | ||
Inačica od 19. studeni 2021. u 02:52
Koeficijent trenja ili faktor trenja (znak μ) je fizikalna veličina koja opisuje razmjernost između trenja i sile koja djeluje okomito na podlogu. Ovisi o hrapavosti i kemijskom sastavu površina koje se dodiruju, njihovoj vlažnosti ili podmazanosti te o načinu gibanja tijela (najveći je faktor trenja mirovanja, manji je faktor trenja klizanja, najmanji faktor trenja kotrljanja). Mjerna je jedinica faktora trenja broj jedan (1). Faktor trenja može se odrediti s pomoću kosine s promjenljivim nagibom, tako da se odredi kut α kod kojega se tijelo počinje gibati niz kosinu, μ = tan α. [1]
Neke približne vrijednosti koeficijenta trenja
| Materijali u dodiru | Koeficijent trenja mirovanja, | Koeficijent trenja klizanja, | |||
|---|---|---|---|---|---|
| Suho i čisto | Podmazano | Suho i čisto | Podmazano | ||
| Aluminij | Čelik | 0,61 | 0,47 [2] | ||
| Aluminijska keramika | Keramika od silicijevog nitrida | 0,004 (mokro)[3] | |||
| BAM (keramička legura AlMgB14) | Titanijev borid (TiB2) | 0,04–0,05 [4] | 0,02 [5][6] | ||
| Mjed ili mesing | Čelik | 0,35 - 0,51[2] | 0,19[2] | 0,44[2] | |
| Lijevano željezo | Bakar | 1,05 | 0,29 [2] | ||
| Lijevano željezo | Cink | 0,85[2] | 0,21[2] | ||
| Beton | Guma | 1,0 | 0,30 (mokro) | 0,6 - 0,85[2] | 0,45 - 0,75 (mokro)[2] |
| Beton | Drvo | 0,62[7] | |||
| Bakar | Staklo | 0,68 | |||
| Bakar | Čelik | 0,53 | 0,36 [2] | ||
| Staklo | Staklo | 0,9 - 1,0[2] | 0,4 [2] | ||
| Tekućina u zglobovima
(sinovijalna tekućina) |
Hrskavica | 0,01 [8] | 0,003 [8] | ||
| Led | Led | 0,02 - 0,09[9] | |||
| Polietilen | Polietilen | 0,2[2][9] | 0,2[2][9] | ||
| PTFE (teflon) | PTFE (teflon) | 0,04[2][9] | 0,04[2][9] | 0,04[2] | |
| Čelik | Led | 0,03[9] | |||
| Čelik | PTFE (Teflon) | 0,04[2]-0.2[9] | 0,04[2] | 0,04[2] | |
| Čelik | Čelik | 0,74[2]-0.80[9] | 0,16[9] | 0,42 - 0,62[2] | |
| Drvo | Metal | 0,2 – 0,6[2][7] | 0,2 (mokro)[2][7] | ||
| Drvo | Drvo | 0,25 – 0,5[2][7] | 0,2 (mokro)[2][7] | ||
| Guma na | asfaltu | 0,9 | 0,8 | ||
| Koža | Metal | 0,6 | 0,2 - 0,25 | ||
Izvori
- ↑ faktor trenja (koeficijent trenja), [1] "Hrvatska enciklopedija", Leksikografski zavod Miroslav Krleža, www.enciklopedija.hr, 2015.
- ↑ 2,00 2,01 2,02 2,03 2,04 2,05 2,06 2,07 2,08 2,09 2,10 2,11 2,12 2,13 2,14 2,15 2,16 2,17 2,18 2,19 2,20 2,21 2,22 2,23 2,24 2,25 "Friction Factors - Coefficients of Friction". http://www.roymech.co.uk/Useful_Tables/Tribology/co_of_frict.htm#method Pristupljeno 27. travanj 2015.
- ↑ "Ultra-low friction coefficient in alumina–silicon nitride pair lubricated with water". http://www.sciencedirect.com/science/article/pii/S0043164812002736 Pristupljeno 27. travanj 2015.
- ↑ Tian, Y.; Bastawros, A. F.; Lo, C. C. H.; Constant, A. P.; Russell, A.M.; Cook, B. A. (2003). "Superhard self-lubricating AlMgB[sub 14] films for microelectromechanical devices". Applied Physics Letters 83 (14): 2781. Bibcode 2003ApPhL..83.2781T. doi:10.1063/1.1615677
- ↑ Kleiner, Kurt (21. studeni 2008.). "Material slicker than Teflon discovered by accident". http://www.newscientist.com/article/dn16102-material-slicker-than-teflon-discovered-by-accident.html Pristupljeno 25. prosinac 2008.
- ↑ Higdon, C.; Cook, B.; Harringa, J.; Russell, A.; Goldsmith, J.; Qu, J.; Blau, P. (2011). "Friction and wear mechanisms in AlMgB14-TiB2 nanocoatings". Wear 271 (9–10): 2111. doi:10.1016/j.wear.2010.11.044
- ↑ 7,0 7,1 7,2 7,3 7,4 Coefficient of Friction. EngineersHandbook.com
- ↑ 8,0 8,1 "Coefficients of Friction of Human Joints". http://hypertextbook.com/facts/2007/ConnieQiu.shtml Pristupljeno 27. travanj 2015.
- ↑ 9,0 9,1 9,2 9,3 9,4 9,5 9,6 9,7 9,8 "The Engineering Toolbox: Friction and Coefficients of Friction". http://www.engineeringtoolbox.com/friction-coefficients-d_778.html Pristupljeno 23. studeni 2008.