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# A karpinska tribology

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### A karpinska tribology

1. 1. Would Life Be Possible Without Tribology ????? Dr A. Karpinska 1
2. 2. Tribology is the science and engineering of interacting surfaces in relative motion 2 SO WHAT IS TRIBOLOGY? Tribology tries to describe everything that happens when things rub together TRIBOLOGY TRIANGLE
3. 3. FRICTION  What is friction? 3 It’s a FORCE. Occurs whenever two objects are IN CONTACT with each other. It’s the resistance to movement. It SLOWS objects down.
4. 4. higher friction lower friction 4 FRICTION Let’s use THE SAME FORCE to move the box on: wooden floor ice Which one will slide further?In which case friction is higher? WHY?
5. 5. 5 THE AMAZING FRICTION CHALLENGE! Pick up thousands of rice grains with a single chopstick.
6. 6. 6 THE AMAZING FRICTION CHALLENGE! Pull apart two books with interwoven pages. 30 s 3 min
7. 7. MAKING CORNFLOUR SLIME 7 Cornflour Water Ratio 50 ml 25 ml 2:1
8. 8. 8 Cornflour is made up of lots of tiny (<0.01mm) angular starch particles, these are very attracted to water so the water gets in amongst them very quickly. The water acts as a lubricant, so when you move it slowly the particles have time to move past each other and they can flow like a liquid. However if you apply a rapid force it causes the particles to move slightly causing the particles that are almost touching to jam together. and the water that was between them moves sideways slightly into the gaps. Now instead of having lots of lubricated individual particles you have a solid structure of lumps touching each other which can't flow.
9. 9.  foods WHERE IS TRIBOLOGY? corn flour + water 920 s
10. 10. HIGH FRICTION 10 good bad
11. 11. HIGH FRICTION 11 bad
12. 12. LOW FRICTION 12 good bad
13. 13.  sport WHERE IS TRIBOLOGY? 13
14. 14.  sport WHERE IS TRIBOLOGY? leather or ... synthetic? 14
15. 15.  cosmetics WHERE IS TRIBOLOGY? 15
16. 16.  cosmetics- hair conditioners WHERE IS TRIBOLOGY? 16
17. 17. WHERE IS TRIBOLOGY? 17  mechanisms: gears, bearings, rail wheels
18. 18. WHERE IS TRIBOLOGY? 18According to specifications, the bearings were to have a life of more than 50 years.
19. 19.  nature and human body WHERE IS TRIBOLOGY? 19
20. 20. WEAR  What is wear? It’s the removal of material from a solid surface by the action of another surface. 20
21. 21. WEAR 21 good bad
22. 22. LUBRICATION Why do we need it? ↓ friction ↓ wear remove heat and contamination  lower the friction  prevent wear
23. 23. LUBRICATION  Types of lubricants OIL 23
24. 24. LUBRICATION  Types of lubricants 24 GREASE
25. 25. LUBRICATION  Types of lubricants 25 AIR Load Pressurized air
26. 26. LUBRICATION  Types of lubricants 26 SOLID
27. 27. LUBRICATION  Types of lubricants 27 SPECIAL SUBSTANCES
28. 28.  just look around !!! TRIBOLOGY IS EVERYWHERE !!! 28
29. 29. Dr A. Karpinska 29 Thank you