Tribology - Tohoku University Official English Website · 9. Wear May 23, 2019 10.Tribo-materials...
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IMAC-U course 6 th semester Tribology 1. Introduction Assoc. Prof. Takeshi YAMAGUCHI [email protected]
Transcript of Tribology - Tohoku University Official English Website · 9. Wear May 23, 2019 10.Tribo-materials...
IMAC-U course 6th semester
Tribology 1. Introduction
Assoc. Prof. Takeshi YAMAGUCHI [email protected]
Schedule
1. Introduction April 8, 2019 2. Surface of solid body April 11, 2019 3. Contact of solid bodies April 18, 2019 4. Friction 1 April 22, 2019 5. Friction 2 (Bobsleigh) April 25, 2019 6. Boundary lubrication May 9, 2019 7. Midterm exam May 13, 2019 8. Hydrodynamic lubrication May 16, 2019 9. Wear May 23, 2019 10.Tribo-materials May 27, 2019 11.Machine elements May 30, 2019 12.Applications of tribology 1 June 3, 2019 13.Applications of tribology 2 June 6, 2019 14.Final exam June 10, 2019
Evaluation
Attendance 30% Midterm Exam 35% Final Exam 35%
( )
Tribology Academic and engineering field related to friction, wear, and lubrication
Solid body
Solid body
Contact Friction
Lubrication
Wear
1966年 The Jost Report (England）
Tribology?
History of Tribology A wall painting of the transportation of a colossus in Egypt (～BC1900) The first record of LUBRICATION in human history!
How large force is needed for a single Egyptian worker?
Traction forces for a single Egyptian worker ranges 250-500N depending on friction coefficient between wood-wood contact.
Da Vince’s Ball Bearing
Drawing of ball bearing devised by
Leonard Da Vince (15th century)
Restoration model based on the Da Vince’s drawing
What Does Tribology Control?
1. Control of ( ) Reduce friction loss: pistons and cylinders Increase in friction: brakes and friction drive system
2. Control of ( ) Increase wear resistance: increase in reliability and machine life Enhance wear: increase in removal rate during processing
3. Control of ( ) Suppress emission: friction noise, vibration, wear debris, environmental burden Use emission: friction sound in musical instruments, frictional heat
As approximated for a speed of 60 km/h.
K. Holmberg, P. Anderson, A. Erdemir, Global energy consumption due to friction in passenger cars, Tribology International, 47, (2012) 221-234.
Fuel energy dissipation in passenger cars
Breakdown of passenger car energy consumption.
( )losses account for 33% of ( )power loss!
nm
mm
mm
m
km
Subject Fields of Tribology Si
ze o
f su
bje
cts
Nanotribology
Microtribology
Chemistry of lubricants
Biotribology
Railway tribology
Automobile tribology
Tibology for industrial instruments
Geotribology
Sports tribology
