2022/23 Taught Postgraduate Module Catalogue
JALJ0004 Technical Diagnostics
10 creditsClass Size: 20
Module manager: Professor Mitjin 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 SciencesThis module is not approved as an Elective
Objectives
GoalsThe course goal is to acquaint the students with the fundamentals of the study of the contact between two elastic or plastic bodies in relative motion, the distribution of force, temperature and contact stresses both on and under the surface; for the case of one-way and reciprocal sliding, and for rolling. Furthermore, the students learn about the effects of friction and thermoelastic study of contacts, including the determination of critical points for the formation of damages, as well as about the process of improvement of tribological properties of contact surfaces using suitable contact surface finishing techniques, focused on the preparation of substrate for the deposition of surface layers, the properties of surface layers, the layered surface mechanics, the selection of contact surface finishing process, as well as some practical applications of contact mechanics in mechanical engineering.
Learning outcomes
Knowledge and understanding
The students obtain the knowledge about the stress-strain field in the contact of two bodies in relative motion, about the effects of friction, load state and surface roughness on the size and position of maximum stresses, and about the processes for the improvement of contact surface resistance. They understand the process of damage formation and the selection of a proper surface finishing technique with regard to the contact stress-strain analysis and the effect of finishing parameters on the mechanical and tribological properties of contact surfaces.
Usage
The knowledge attained enables the students to select the proper surface finishing method and to design components with improved surface resistance and optimal tribological properties for the given contact conditions.
Reflection
The theoretical knowledge assimilated 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.
Transferrable skills related to more than one course
Using domestic and foreign literature, collecting and interpreting data, using information and communication technology and other didactic aids, using different procedures, reporting (oral and in writing), problem identification and solving, critical analysis, synthesis, writing reports, reflection on the literature read, teamwork, social skills, and so forth.
Skills outcomes
Competences
- The student will master the fundamentals of contact analysis in one-way and reciprocal sliding and rolling
- They will learn to determine the critical points for the formation of damages on and under the contact surface
- They will master the planning process for the improvement of resistance and tribological properties of contact surfaces, as well as the procedure for the selection of contact surface finishing process and parameters with regard to the stress-strain state
They will understand the importance of proper surface preparation, treatment and modification in ensuring the optimal contact properties
Syllabus
- Contact between two surfaces; Elastic contact between two curved surfaces: geometry, forces, velocities and stress-strain field; The influence of load on the contact stresses: line, semi-elliptical, inverse semi-elliptical and arbitrary continuous contact pressure distribution, normal and tangential load; Hertzian contact theory: contact between single- and multi-layer surfaces; Stress analysis of contact in motion: one-way sliding, reciprocal sliding, micro and macro slip, rolling; Elastic-plastic contact: elastic deformation, plastic deformation, the influence of tangential load, surface load-carrying capacity; Contact between rough surfaces: the influence of micro- and macro-roughness on the distribution of stress-strain field; Thermoelastic contact, thermal instability of contact; Interactions between surface and surroundings, surface energy
- Contact surface characterization; Microscopy; Surface film analysis techniques EDS, X-Ray, IR, XPS, Auger,...; profilometry and topography, surface load-carrying capacity; Contact surface hardness and elasticity; Residual stresses in surface layers, Surface layer adhesion
Improving the tribological properties of contact surfaces; contact surface texturing: the methods of texturing and the effects thereof on the tribological properties; Overview of contact surface finishing processes: tribological properties, advantages, disadvantages and limitations; Protective surface layers: types and tribological properties, diamond and diamond-like coatings, multicomponent and multilayer coatings; preparing contact surfaces for finishing; the influence of hardness, roughness, residual stresses, surface finishing method and contact conditions; Stress-strain analysis and the tribological response of finished contact surfaces; The criteria and procedure for selecting the contact surface texturing and/or finishing, examples of applications in mechanical engineering.
Teaching methods
| Delivery type | Number | Length hours | Student hours |
| Lecture | 45 | 1.00 | 45.00 |
| Tutorial | 30 | 1.00 | 30.00 |
| Private study hours | 25.00 | ||
| Total Contact hours | 75.00 | ||
| Total hours (100hr per 10 credits) | 100.00 | ||
Private study
Directed reading in support of lectures and tutorialsPreparation for practical/tutorial reports
Revision for final examination
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 | |
The methodology for the determination of the final grade for this module considers the student's success in the planned forms of knowledge testing and is determined for each study year individually in the course execution plan. Methods of assessment and grading scale are defined in Section 6.3 of the Consortium Agreement for the master study program Tribology of surfaces and interfaces.
Reading list
There is no reading list for this moduleLast updated: 29/04/2022 15:31:27
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