Tribology is the study of friction, wear, and lubrication between surfaces in contact. It introduces key concepts like viscosity, lubricants, and different regimes of lubrication. Viscosity is important for a fluid's ability to carry loads as friction is converted to heat. Different instruments can be used to measure viscosity, like viscometers that determine damping effects on an oscillating resonator immersed in the fluid. Tribology is important because lubricants allow objects to move with low friction and prevent wear.

1. TRIBOLOGY
INTRODUCTION
SIVA S
M.tech Machine Design

2. Any body when gets contact with other body, there comes the role of
Tribology.
Study of [ Friction + Wear + Lubrication ] = TRIBOLOGY
“We are born due to lubricants, live with the frictions and die due to wear”

3. The ability of fluid film to carry loads depends directly on the
viscosity of the lubrication.
As the fluid resist flow, the W.D. on fluid is converted into
heat.
FRICTION  HEAT  to eliminate  LUBRICANTS

4. Keywords to ponder :
• Viscosity
• Lubricants
• Newtonian fluids
• Shear forces

5. VISCOMETER
VISCOMTER
ORIFICE CAPILLARY FALLING BALL VIBRATIONAL
FALLING
PISTON
Instrument used to measure the viscosity of a fluid.

6. VIBRATIONAL VISCOMTER :
• Measuring the damping of an oscillating
electromechanical resonator immersed in a
fluid whose viscosity is to be determined.
• The higher the viscosity, the larger the
damping imposed on the resonator

7. REGIMES OF LUBRICATIONS

8. Newton’s Law Of Viscous Flow
ր=
𝑭𝒉
𝑨𝑼
ր = Absolute Viscosity
F = Applied Force
h = Thickness of Lubrication film
U = Velocity of moving plate
Moving Plate
y u
F
x
A A’ B B’
C C’ D D’ h
Stationary Plate

9. THANK YOU