Tribology

Données Générales
Programme Académique	ECAM LaSalle Mechanical and Electrical Engineering Programme			Responsable(s) Module : MAJDOUB Fida
Type d'EC : Cours	Tribology (LIIEEng08EIntroTribology)
TD : 8h00 Cours : 12h00 Durée totale: 20h00	Status	Periode Semester 8	Langue d'enseignement : English

Objectifs Généraux
Upon completion of this course, the students are expected to: 1. Explain the importance, role and properties of contact surfaces, materials and surroundings. 2. Analyze the influence of the parameters of a tribological system and contact conditions on the properties of friction. 3. Identify the types and the role of lubricants, as well as their influence on the quality of lubrication, friction, and on various friction and wear mechanics as well as fatigue life. 4. Measure friction using a pin-on-disk tribometer and interpret the effect of materials, lubrication, and some operating conditions on the friction coefficient. 5. Analyze some real cases and propose some solutions.

Objectifs Généraux

Upon completion of this course, the students are expected to:
1. Explain the importance, role and properties of contact surfaces, materials and surroundings.
2. Analyze the influence of the parameters of a tribological system and contact conditions on the properties of friction.
3. Identify the types and the role of lubricants, as well as their influence on the quality of lubrication, friction, and on various friction and wear mechanics as well as fatigue life.
4. Measure friction using a pin-on-disk tribometer and interpret the effect of materials, lubrication, and some operating conditions on the friction coefficient.
5. Analyze some real cases and propose some solutions.

Contenu
1. Introduction • Definition of Tribology and Tribological Systems • Applications and Scales in Tribology • Types of Motion • Tribological Testing and Types of Tribometers • Roughness 2. Lubrication and Lubricant Properties • Classification of Lubrication and Lubricant Properties • The Stribeck Curve and Lubrication Regimes • Types of contacts and film thickness • Hertzian Contact Theory • Solid-Solid Contact-Asperity Deformation 3. Friction • Friction Coefficient • Types of Friction • Laws of Dry Friction • Basic Mechanisms of Sliding Friction • Adhesion and Deformation • Stick-Slip Phenomenon 4. Fluid Film Lubrication • Classification of Fluid Film Lubrication • Newtonian and Non-Newtonian Fluids • 1-D Flow between Parallel Plates • Hydrostatic and Hydrodynamic Thrust Bearings 5. Wear • Parameters and Stages of Wear • Wear Types and Mechanisms • Wear Rate • Causes of Wear and Prevention Methods

Contenu

1. Introduction
• Definition of Tribology and Tribological Systems
• Applications and Scales in Tribology
• Types of Motion
• Tribological Testing and Types of Tribometers
• Roughness
2. Lubrication and Lubricant Properties
• Classification of Lubrication and Lubricant Properties
• The Stribeck Curve and Lubrication Regimes
• Types of contacts and film thickness
• Hertzian Contact Theory
• Solid-Solid Contact-Asperity Deformation
3. Friction
• Friction Coefficient
• Types of Friction
• Laws of Dry Friction
• Basic Mechanisms of Sliding Friction
• Adhesion and Deformation
• Stick-Slip Phenomenon
4. Fluid Film Lubrication
• Classification of Fluid Film Lubrication
• Newtonian and Non-Newtonian Fluids
• 1-D Flow between Parallel Plates
• Hydrostatic and Hydrodynamic Thrust Bearings
5. Wear
• Parameters and Stages of Wear
• Wear Types and Mechanisms
• Wear Rate
• Causes of Wear and Prevention Methods

Prérequis
Materials 3, Strength of materials, Fluid mechanics, General mechanics 3, Vibrations

Bibliographie
Recommended resources: Bhushan, B. (2013). Introduction to tribology. John Wiley & Sons. Williams, J. (2005). Engineering tribology. Cambridge University Press. Georges, J-M. (2000). Frottement, usure et lubrification. CNRS & Eyrolles.

Évaluation(s)
N°	Nature	Coefficient	Objectifs
1		0,70	At the end of the course, there will be a final exam about all the concepts covered in the course and the Laboratory sessions. The exam consists of short questions as well as thorough analysis problems.
2	Written exam	0,1	The students should expect a drop quiz in each session about the previous lesson. The students will be assigned to read research articles about several tribological systems and then, present the state of art. Students will be graded on their ability to analyze the topic as well as to correlate what they learned in the course to the research.
3	Practical work	0,2	Students will perform a friction test on different tribological systems with a variety of parameters. They have to examine the effect of each parameter on the friction coefficient. Students will write report after the LAB session. They will be graded on the quality of the experimental results and their analysis capacity.