Tribology

Ficha de unidade curricular - Ano letivo 2020/2021

Teaching language

Portuguese

Intended learning outcomes (Knowledges, skills and competencies to be developed by the students)

To convey profound knowledge about tribological variables, lubricant properties, hydrodynamic lubrication and lubricant analysis.

Syllabus

1. General Concepts, Tribology, Lubrication and Wear
2. Understanding Friction
3. Physical Properties of Lubricants
3.1 Dynamic Viscosity
3.2 Kinematic Viscosity
3.3 Temperature-Viscosity Ratio
3.4 Viscosity index
3.5 Viscosity - Pressure Ratio
3.6 Viscosity Ratio - Cutting Voltage
3.7 Determination of Viscosity
3.8 Mixture Viscosity
3.9 Classifications for Viscosity in Oils
Classification S A E
Classification I S O
3.10 Temperatures Characteristics of Lubricants
Point of Fluidity and Precipitation
Flash Point and Combustion
Evaporation and Volatility
Stability and Oxidation
Thermal stability
Superficial tension
3.11Compatibility and Solubility of Additives
3.12 Compatibility with elastomers and filter materials
4. Hydrodynamic Lubrication
4.1 Reynolds equation
Bearing Parameters
Pressure Distribution
Load Capacities
Frictional force
Coefficient of friction
Flow
4.2 Flat bearings
Infinite Flat Bearings
Geometry
Pressure Distribution
Load Capacities
Frictional force
Coefficient of friction
Flow

4.3 Radial Bearings
Geometry
Pressure Distribution
Load Capacities
Frictional force
Coefficient of friction
Flow
5. Impurities and Contaminants of Lubricants
Water Content
Sulfur Content
Chlorine Content
Solubility of Gases in Oil

6. Filtering
7. Greases
8. Synthetic Lubricants
9. Fuels
9.1 Main fossil fuels
9.2 Fuels for internal combustion engines
9.3 Gasoline and diesel properties, applicable standards
9.4 Alternative fuels

Demonstration of the syllabus coherence with the UC intended learning outcomes

Theoretical-practical classes, in which the matter is explained referring concrete cases, being complemented by exercises of application.
Observation of concrete situations in practical classes and study visits.
Application of concepts acquired in case studies and laboratory work.
Support through seminars with guest speakers and other initiatives.

Demonstration of the teaching methodologies coherence with the curricular unit's intended learning outcomes

TEST

2 reports on seminars

OR
Recovery of the TEST in the Period of Examinations

THE TEST OR RECOVERY NOTE MUST BE UP TO 9.5 VALUES