Introduction to tribology:
Historical background, practical importance, and subsequent use in the field. Lubricants: Types and specific field of applications. Properties of lubricants,viscosity, its measurement, effect of temperature and pressure on viscosity, lubrication types, standard grades of lubricants, and selection of lubricants.
Friction:
Origin, friction theories, measurement methods, friction of metals and non-metals.
Wear:
Classification and mechanisms of wear, delamination theory, debris analysis, testing methods and standards. Related case studies.
Hydrodynamic journal bearings:
Friction forces and power loss in a lightly loaded journal bearing, Petroff’s equation, mechanism of pressure development in an oil film, and Reynold’s equation in 2D.
Introduction to idealized journal bearing, load carrying capacity, condition for equilibrium, Sommerfeld’s number and it’ssignificance;partial bearings, end leakages in journal bearing, numerical examples on full journal bearings only.
Plane slider bearings with fixed/pivoted shoe:
Pressure distribution, Load carrying capacity, coefficient of friction, frictional resistance in a fixed/pivoted shoe bearing,center of pressure, numerical examples.
Hydrostatic Lubrication:
Introduction to hydrostatic lubrication, hydrostatic step bearings, load carrying capacity and oil flow through the hydrostatic step bearing, numerical examples.
Bearing Materials:
Commonly used bearings materials, and properties of typical bearing materials. Advantages and disadvantages of bearing materials.
Introduction to Surface engineering:
Concept and scope of surface engineering. Surface modification – transformation hardening, surface melting, thermo chemical processes. Surface Coating – plating,fusionprocesses, vapor phase processes. Selection of coating for wear and corrosion resistance.
COURSE OUTCOMES:
After studying this course, students will be able to:
CO1 Understand the fundamentals of tribology and associated parameters.
CO2 Apply concepts of tribology for the performance analysis and design of components experiencing relative motion.
CO3 Analyse the requirements and design hydrodynamic journal and plane slider bearings for a given application.
CO4 Select proper bearing materials and lubricants for a given tribological application.
CO5 Apply the principles of surface engineering for different applications of tribology.
Scheme of Examination:
TEXTBOOKS:
1.”Introduction to Tribology”, B. Bhushan, John Wiley & Sons, Inc., New York, 2002
2. “Engineering Tribology”, Prasanta Sahoo, PHI Learning Private Ltd, New Delhi, 2011.
3.“Engineering Tribology”, J. A. Williams, Oxford Univ. Press, 2005.
REFERENCES:
1. “Introduction to Tribology in bearings”, B. C. Majumdar, Wheeler Publishing.
2. “Tribology, Friction and Wear of Engineering Material”, I. M.Hutchings, Edward Arnold, London,1992.
3. “Engineering Tribology”, G. W. Stachowiak and A. W. Batchelor, Butterworth-Heinemann,1992.
4. “Friction and Wear of Materials”, Ernest Rabinowicz, John Wiley & sons,1995.
5. “Basic Lubrication Theory”, A. Cameron, Ellis Hardwoods Ltd., UK.
6. “Handbook of tribology: materials, coatings and surface treatments”, B.Bhushan, B.K. Gupta, McGraw-Hill,1997.