ME 255 : Principles of Tribology

• Introduction

History, Interdisciplinary, Surfaces and Interfaces,

• Surface Properties

Geometrical – Atomic nature, Surface genertation, Roughness, “Smooth Surfaces”

Physical -  Surface Energy, Adhesion, Macro-Micro –Material Properties

Chemical – Hydrophobic- Hydrophobic

Measurement techniques -  Profilometer, STM, AFM, SPM, Indentation, Electron Probe Techniques, optical probes, X-ray

Adsorption – Physisorption, chemisorption

• Surface-surface Interactions

Hertzian contact, Point load, Sliding, Stick –Slip, Plasticity

Asperity contacts

Void, crack nucleation and propagation

Friction – Theories – genesis- mechanisms

Wear – Theories, Sliding, Abrasion, Erosion ‘Fatigue, Fretting

Measuring friction and wear

• Surface-Liquid Interactions

Contact angle, Long range Forces, Monolayers, Confined Liquids

• Surface-Liquid-Surface Interactions

Viscosity

Lubricants- Compostion - additivies

Hydrostatic, hydrodynamic, elasto-hydrodynamic lubrication.