1. Presentation On: TRIBOLOGY
MAHARASHTRA INSTITUTE OF TECHNOLOGY, AURANGABAD
Presentation On: TRIBOLOGY
BY,
VISHAL PRAKASH SAMUNDRE
T.Y. MECHANICAL
ROLL NO: 56
GUIDED BY,
MR. S C HISWANKAR

2. WHAT IS TRIBOLOGY?
Derived From the Greek word ‘tribos’ means rubbing or sliding.
English equivalent name is friction and wear or lubrication science.
It focuses on friction, wear and lubrication of interacting surfaces in relative motion.
It is applied to an operational analysis to problems of great economic significance.

3. Need of Tribological study
To minimize and eliminate losses.
Greater efficiency, performance, fewer breakdowns & savings.
Study various losses and analysis of losses.
Reduce losses by introducing a layer of lubrication.
Atomic and molecular observations on sliding surfaces.

4. Various term in Tribology
Wear & Various types of wear
Friction
Lubrication & Various types of lubrication

6. WEAR Abrasion, erosion, Cavitation are forms of wear.
Loss of material by the passage of hard particles over a surface known as Abrasive Wear.
Erosive wear is caused by the impact of particles against a solid surface.
Cavitation wear is caused by the localized impact of fluid against a surface or fast flowing fluids.

7. EROSIVE WEAR

8. CAVITATION WEAR
Cyclic formation and collapse of bubbles on a solid surface.
Bubble formation is caused by the release of dissolved gas from the liquid, which has negative pressure.

9. FRICTION Force that resists the sliding or rolling.
Needed for the satisfactory functioning of nuts and bolts, paper clips, and tongs, etc.
Experimental facts characterize the friction of sliding solids:
The amount of friction is nearly independent of the area of contact.
Friction is proportional to the load or weight that presses the surfaces together.

10. Lubrication
Thin layers of gas, liquid and solid interposed between two surface.
Layers of material separate contacting solid bodies.
The thicknesses of these films range from [pal].
Main aim of lubrication is to reduce the wear and friction.

11. TYPES OF LUBRICATIONS
Hydrodynamic lubrication- Analysis of Gaseous or liquid films is usually termed
Solid lubrication- Lubrication by solids is termed, Ex. Graphite
Elastohydrodynamic lubrication- Physical interaction between the contacting Bodies and the liquid lubricant.
Hydrostatic lubrication- Complete separation of sliding surfaces with negligible wear and very low friction. Applied to aerostatic and hybrid bearings.

12. TRIBOLOGICAL INSTRUMENTS
TRIBOMETER
Measures tribological quantities, such as coefficient of friction, friction force, and wear volume.
Invented By- Dutch scientist Musschenbroek.

13. TRIBOMETER

14. WORKING OF TRIBOMETER

15. ADVANTAGES Helps in reducing friction and wear.
Proper type of lubrication can be easily selected
Increased efficiency and life of a product or machine.
Best utilization of a machine can be achieved.

16. CONCLUSION
The study of Tribology is important so as to increase the efficiency of any machine components or parts which has relative motion between them due to which friction and wear occurs in the machine or component. A tribological study has helped in various sectors like polymers, metals and gases.