Unit 1 Introduction to Tribology

3 lecture hours

• Introduction to tribology and its historical background
• Factors influencing Tribological phenomena
• Introduction to tribological processes and tribological relevant properties of materials
• An overview of engineering materials having potential for tribological application

Unit 2 Surfaces, Friction and Wear

12 lecture hours

• Engineering surfaces - Surface characterization
• Computation of surface parameters
• Surface measurement techniques
• Apparent and real area of contact
• Contact of engineering surfaces- Hertzian and nonhertzian contact
• Contact pressure and deformation in non- conformal contacts
• Genesis of friction
• friction in contacting rough surfaces
• sliding and rolling friction
• Various laws and theory of friction
• Stick-slip friction behaviour
• frictional heating and temperature rise
• Friction measurement techniques
• Wear and wear types
• Mechanisms of wear - Adhesive
• Wear of metals and non-metals
• Wear models - asperity contact
• constant and variable wear rate
• geometrical influence in wear models
• wear damage
• Wear in various mechanical components
• wear controlling techniques

Unit 3 Lubrication

• Lubricants and their physical properties
• lubricants standards – Additives and selection of Lubricants-Lubrication regimes
• Hydrodynamic lubrication – Reynolds Equation – Thermal - Inertia and turbulent effects –Elasto hydrodynamic and plasto hydrodynamic theory-soft and hard EHL-Reynolds equation-film shape and thickness within and outside contact zones-Hydro static lubrication – Gas Lubrication. 12 Subject Code:3720911 w.e.f