2022/23 Taught Postgraduate Module Catalogue

JALJ0001 Tribology

10 creditsClass Size: 20

Module manager: Professor Mitjan Kalin
Email: mitjan.kalin@tint.fs.uni-lj.si

Taught: Semester 2 (Jan to Jun) View Timetable

Year running 2022/23

Pre-requisite qualifications

Min 2(i) Engineering or Physical Sciences

This module is not approved as an Elective

Objectives

The fundamental syllabus goal is to present the students with basic knowledge on tribological contact in mechanical systems in relative motion. The course presents the importance, role and properties of contact surfaces, materials and surroundings. Furthermore, the influence of the components of a tribological system and contact conditions on the properties of friction and tear is explained. The course covers 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. In relation to these topics, the analytical techniques available for the analysis of surface properties, lubricants, tribological behaviour and wider systems are presented.

Learning outcomes
Knowledge and understanding
The students will be able to analyse and evaluate the following topics:
- Knowing the properties and the importance of contact surfaces in designing and monitoring technical systems and work processes.
- Knowing different types of lubricants, their properties and their fundamental differences.
- Knowing the basic characteristics and quality of lubrication.
- Knowing the main sources of friction, basic laws of friction, influences.
- Knowing the types and basic characteristics of material wear mechanisms (fatigue, abrasion, adhesion, cavitation, erosion, oxidation, corrosion, fretting).
- Knowing the types, possibilities and techniques for the characterisation of surfaces, damages of machine elements and the quality of lubrication and lubricants.
Usage
The knowledge acquired in this course will especially benefit the students in solving tribological problems, especially in the development or use of different systems requiring the reduction of energy and raw material usage, taking care of environmental problems, controlling friction and wear, or selecting and maintaining lubricants.
Reflection
The theoretical knowledge assimilated in the course and the experience gained from experimental work in the laboratory environment will be directly transferrable and useful for various research and development and practical purposes in the field of design and monitoring of all technical systems.
Transferable skills related to more than one course
The use of modern professional literature and practical work using modern experimental equipment in an orderly and internationally recognised laboratory environment.

Skills outcomes
The students will be able to independently analyse and evaluate the basic tribological parameters, such as the suitability of materials and surface finish, selection of lubricants and contact loads. They will independently analyse the expected tribological effects and their influence on friction and wear. They will know the basic tools and techniques used to analyse the surfaces and tribological properties of mechanical systems.

Syllabus

- Introduction: definition, topics, course framework, the importance of tribology in mechanical systems and the economical aspects of tribology.
- Basic characteristics of contact surfaces: geometric surface, real contact surface, Greenwood-Williamson model of contact, plasticity index according to the GW and Whitehouse models, surface roughness (qualitative and quantitative parameters and their influence on tribological properties), topography (Sk, K and other parameters, measurement, influence on tribological properties, values), hardness (physical principle of measurement, influence of creep and friction), toughness (impact on the real contact surface, properties and influence of different materials, influence of plasticity index), influence on the tribological contacts (examples and effects on different materials and components).
- Basics of tribological contacts: contact types (line, point, elliptical), Hertz contact stresses (derivation, distribution, size, profile stress form), contacts with and without friction (stresses on and under the surface with and without the consideration of friction, the influence of friction on the stress-strain state of the contact, impact on the tribological properties, fatigue...), contact temperature (Archard and Ashby model of contact temperatures, key influences on the tribological properties and the change of materials).
- Lubricants: types of base oils (mineral, synthetic, biodegradable) and additives (friction modifiers, anti-wear), their role, physically-chemical properties of lubricants (viscosity, viscosity index, pressure-viscosity, temperature-viscosity, thermal properties of lubricants etc.), criteria for the selection of lubricants.
- Quality of lubrication: Stribeck curve and the basic modes of lubrication (hydrodynamic lubrication, two-dimensional Reynolds equation, solutions for selected cases, elastohydrodinamic lubrication and pressure distribution, influence of viscosity, deformations, mixed lubrication, the influence of surfaces, boundary lubrication), characteristics and the influence on component life.
- Friction: causes of friction in mechanical systems, rules and exceptions (Amonton, Coulomb), models and influences (contribution of Tabor and Rabinowicz), a modern view on the sources of friction, friction of lubricated contacts, influences, friction of dry contacts and characteristic solid materials for non-lubricated contacts and dry lubricants (graphite, MoS2, polymeric materials…), friction characteristics for different materials.
- Types of wear and their basic characteristics (sliding and rolling fatigue, delamination theory, formation of wear particles, abrasion, erosion, adhesion, corrosion, oxidation, fretting, cavitation).
Basics of damage and surface characterisation: examples of typical surface damages (pitting, galling etc.), types and techniques for the characterisation of surfaces and damages on machine elements, quality of lubrication and lubricants, techniques.
Competences
The students will be able to independently analyse and evaluate the basic tribological parameters, such as the suitability of materials and surface finish, selection of lubricants and contact loads. They will independently analyse the expected tribological effects and their influence on friction and wear. They will know the basic tools and techniques used to analyse the surfaces and tribological properties of mechanical systems.

Teaching methods

Delivery type	Number	Length hours	Student hours
Lecture	30	1.00	30.00
Tutorial	30	1.00	30.00
Private study hours			40.00
Total Contact hours			60.00
Total hours (100hr per 10 credits)			100.00

Methods of assessment

Coursework

Assessment type	Notes	% of formal assessment
Tutorial Performance	.	50.00
Total percentage (Assessment Coursework)		50.00

Normally resits will be assessed by the same methodology as the first attempt, unless otherwise stated

Exams

Exam type	Exam duration	% of formal assessment
Standard exam (closed essays, MCQs etc)	0 hr	50.00
Total percentage (Assessment Exams)		50.00

Normally resits will be assessed by the same methodology as the first attempt, unless otherwise stated

Reading list

There is no reading list for this module

Last updated: 29/04/2022 15:31:27

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