ME560 TRIBOLOGY
| Course Code: | 5690560 |
| METU Credit (Theoretical-Laboratory hours/week): | 3 (3.00 - 0.00) |
| ECTS Credit: | 8.0 |
| Department: | Mechanical Engineering |
| Language of Instruction: | English |
| Level of Study: | Graduate |
| Course Coordinator: | Prof.Dr. METİN AKKÖK |
| Offered Semester: | Fall and Spring Semesters. |
Course Objectives
The main objectives of the course are:
- to understand the nature of engineering surfaces, their topography and surface characterization techniques,
- to learn about the contact of rough surfaces and their interactions,
- to apply the basic theories/laws of sliding and rolling friction to predict the frictional behavior of commonly encountered sliding interfaces,
- to learn about wear mechanisms, wear theories, and analyze and estimate wear rates on rubbing surfaces,
- to learn about the basic principles of lubrication, theories of hydrodynamic and elastohydrodynamic lubrication and apply to engineering problems,
- to interpret the latest research on new topics in tribology including its application to mechanical devices and systems.
- to be aware of importance of tribology, friction, wear and lubrication and the applications in engineering areas.
Course Content
Dry surface friction. Frictional interface and friction theories. Interface temperature during unlubricated sliding. Wear mechanism. Adhesive, abrasive, corrosive and other types of wear. Wear measurement. Properties of lubricants. Boundary lubrication. Viscosity variation with temperature and pressure. Hydrodynamic lubrication: Reynolds equation. Hydrostatic bearing design. Energy equation. Elastohydrodynamic lubrication. (S)
Course Learning Outcomes
At the end of this course, the students will be able to;
- Understand the nature of rough surfaces, their topography and learn about surface characterization techniques
- Learn about the contact mechanics of rough surfaces (elastic, plastic, and elastoplastic contacts) and rough surface contact models,
- Learn about the laws of friction, mechanisms of friction, stiction, stick-slip, and contact temperature during sliding,
- Recognize the various modes of wear (adhesive, delamination, abrasive, fretting, erosive, corrosive, oxidational, etc.) and learn the factors affecting wear and how to determine ware rates,
- Understand the fundamental principles of lubrication and apply them to hydrodynamically lubricated surfaces to determine the pressure distribution, load-carrying capacity, coefficient of friction, oil flow rate required, and temperature increase.
- Understand the fundamental principles of thermohydrodynamic lubrication to determine the temperature distribution in the lubricant film under variable viscosity conditions,
- Learn about the fundamental principles of elastohydrodynamic lubrication by considering the effects of deformations on lubricated concentrated contacts and to determine the oil film thickness and the deformation of surfaces.