Tribology

General Data
Academic program	ECAM ENGINEERING PROGRAM			:
Type d'EC	Classes
Lectures : 12h00 Tutorials : 8h00 Total duration : 40h00	Status :	Period : SEMESTER 8	Education language : English

Learning Outcomes
Upon completion of this course, the students are expected to: 1. Have a basic knowledge in tribological contact for some mechanical systems in relative motion. 2. Understand the importance, role and properties of contact surfaces, materials and surroundings. 3. Analyze the influence of the parameters of a tribological system and contact conditions on the properties of friction. 4. Be familiar with 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. 5. To measure friction using a pin-on-disk tribometer and study the influence of materials, lubrication, and some operating conditions on the friction coefficient.

Learning Outcomes

Upon completion of this course, the students are expected to:
1. Have a basic knowledge in tribological contact for some mechanical systems in relative motion.
2. Understand the importance, role and properties of contact surfaces, materials and surroundings.
3. Analyze the influence of the parameters of a tribological system and contact conditions on the properties of friction.
4. Be familiar with 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.
5. To measure friction using a pin-on-disk tribometer and study the influence of materials, lubrication, and some operating conditions on the friction coefficient.

Content
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

Content

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

Pre-requisites / co-requisites
Materials 3, Strength of materials, Fluid mechanics, General mechanics 3

Bibliography
Essential resources: Not required 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.

Assessment(s)
N°	Nature	Coefficient	Observable objectives
1	Students will have a mid-term at the mid-course about the topics covered in the first half of the course: Fundamentals of Tribology, Lubrication and Lubricant Properties, Friction.	0,30	In this midterm, the students will be evaluated in the following topics: - Understanding the significance of tribology - Defining tribological systems - Types of Tribometers - Lubrication properties and Stribeck curve - Classification of Lubrication and Lubricant Properties - Hertzian Contact Theory - Friction laws - Basic mechanisms of friction
2	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.	0,50	The final exam tests the students’ understanding of the entire course, which includes: - Understanding the significance of tribology - Defining tribological systems - Types of Tribometers - Lubrication properties and Stribeck curve - Classification of Lubrication and Lubricant Properties - Hertzian Contact Theory - Friction laws - Basic mechanisms of friction - Fluid Film Lubrication - Hydrostatic and Hydrodynamic Thrust Bearings - Wear mechanism and stages - Causes of Wear and Prevention Methods
3	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.	0,1	Practical work
4	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.	0,1	Continuous Assessment