Tribology (FSI-ZTR)

Academic year 2022/2023
Supervisor: prof. Ing. Martin Hartl, Ph.D.  
Supervising institute: ÚK all courses guaranted by this institute
Teaching language: Czech
Aims of the course unit:
Students after passing the subject will be able to analyse, understand and solve main problems of friction, lubrication and wear of contacts in machines.
Learning outcomes and competences:

Knowledge of main principles, calculations and rules for design of contacts.
Ability to apply gained knowledge in design and development of new machines and equipment.
Knowledge of methodology for selection and tribology testing of material combinations.
Capability to solve tribological problems of dry and liquid lubricated contacts.
Prerequisites:
Knowledge from material sciences, strength of materials, machine design and hydrodynamics.
Course contents:

The subject provides theoretical and practical knowledge regarding processes of friction, lubrication and wear which take place in machines with essential importance in design, production and maintenance. Attention is paid on student’s overview in the field, understanding of main principles and practical experience from laboratory measurements. The subject follows up and complements content of subjects in the Batchelor’s study in the fields of the mechanics, mechanical engineering and material sciences.
Teaching methods and criteria:
Lectures, exercises, laboratory exercises, self-study.
Assesment methods and criteria linked to learning outcomes:
Conditions for obtaining credit:
- submission of a case study of the tribological system (max. 30 points).
Conditions for obtaining final exam:
- multiple-choice test (max. 30 points),
- oral exam (max. 40 points),
- points from exercises (max. 30 points),
- maximum possible points are 100, final classification is given according to ECTS scale.
Controlled participation in lessons:
Lectures: attendance is mandatory and checked by the teacher.
Exercises: participation is mandatory and checked by the teacher, maximum two absences.
In case of long-term absence, compensation for missed classes is in the competence of the subject guarantor.
Type of course unit:
    Lecture  8 × 2 hrs. compulsory                  
    Laboratory exercise  8 × 2 hrs. compulsory                  
    Computer-assisted exercise  8 × 2 hrs. compulsory                  
Course curriculum:
    Lecture

- Introduction to tribology, importance a historical development.
- Tribological system and processes. Principles and regimes of lubrication.
- Properties of solids and lubricants. Lubricants rheology.
- Lubricant types. Liquid lubricants and lubricant additives. Greases and solid lubricants.
- Contact mechanics. Hertzian theory. Measurements of surface topography. Contact between rough surfaces.
- Hydrodynamic lubrication. Reynolds Equation. Plain bearings. Hydrostatic lubrication.
- Elastohydrodynamic and mixed lubrication. Numerical modelling. Molecular dynamic simulation.
- Tribology of compliant contacts.
- Boundary lubrication and boundary films.
- Tribology of thin layers, films and coatings. Dry lubrication.
- Friction, wear and tribotesting.
- Wear analysis.
- Tribological analysis of selected machine parts.
    Laboratory exercise

- Measurement of surface topography.
- Measurement of fluids viscosity.
- Measurement of hardness and load capacity of static point contact.
- Measurement of pressure field in hydrodynamically lubricated contact.
- Measurement of film thickness distribution in elastohydrodynamic contact.
- Measurement of Stribeck and traction curves.
- Measurement of wear rate.
- Tribology of wheel-rail contact.
    Computer-assisted exercise

- Viscosity, modelling of rheology and shear stress in lubricants.
- Hertzian contact problem. Load-carrying capacity of static contact. Contact stiffness.
- Hydrostatic and hydrodynamic lubrication.
- Regimes of lubrication, film thickness and film parameter prediction.
- Real contact area. Flash temperature.
- Fluid film friction.
- Wear rate. Coefficient of abrasive wear.
Literature - fundamental:
1. STACHOWIAK, G. W. a A. W. BATCHELOR. Engineering tribology. Fourth edition. Oxford: Elsevier/Butterworth-Heinemann, 2014. [cit. 2019-08-30] ISBN 0123970474. [Online] Dostupná z: https://app.knovel.com/hotlink/toc/id:kpETE00005/engineering-tribology/engineering-tribology
Literature - recommended:
1. STOLARSKI, T. A. Tribology in machine design. Oxford: Heinemann Newnes, 1990. [cit. 2019-08-30] ISBN 0434918261. [Online] Dostupná z: https://app.knovel.com/hotlink/toc/id:kpTMD00001/tribology-in-machine/tribology-in-machine
2. SZERI, A. Z. Fluid film lubrication. 2nd ed. New York: Cambridge University Press, 2011. [cit. 2019-08-30] ISBN 0521898234. [Online] Dostupná z: https://app.knovel.com/hotlink/toc/id:kpFFLE000F/fluid-film-lubrication/fluid-film-lubrication
The study programmes with the given course:
Programme Study form Branch Spec. Final classification   Course-unit credits     Obligation     Level     Year     Semester  
CŽV full-time study CZV Bases of Mechanical Engineering -- Cr,Ex 4 Compulsory 1 1 S
N-KSI-P full-time study --- no specialisation -- Cr,Ex 4 Compulsory 2 1 S