ME-617 Tribology and Wear


Credit Hours = 3


  • Characteristics of contact surfaces: Geometric surface, real contact surface, Greenwood-Williamson model of contact, plasticity index according to the GW and Whitehouse models, surface roughness, topography, hardness, toughness, influence on the tribological contacts.
  • Friction: Causes of friction in mechanical systems, rules and exceptions , models and influences, a modern view on the sources of friction, friction of lubricated contacts, influences, friction of dry contacts and characteristic solid materials for non-lubricated contacts and dry lubricants, friction characteristics for different materials.
  • Types of wear and their characteristics: sliding and rolling fatigue, delamination theory, formation of wear particles, abrasion, erosion, adhesion, corrosion, oxidation, fretting, cavitation. Basics of damage and surface characterization: examples of typical surface damages (pitting, galling etc.), types and techniques for the characterization of surfaces and damages on machine elements, quality of lubrication and lubricants, techniques.
  • Tribological contacts: contact types, Hertz contact stresses, contacts with and without friction, contact temperature, Archard and Ashby model of contact temperatures, key influences on the tribological properties and the change of materials.
  • Lubricants: types of base oils and additives, their role, physically-chemical properties of lubricants (viscosity, viscosity index, pressure-viscosity, temperature-viscosity, thermal properties of lubricants etc.) .


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