Fractography (FSI-WFR)

Academic year 2021/2022
Supervisor: doc. Ing. Libor Pantělejev, Ph.D.  
Supervising institute: ÚMVI all courses guaranted by this institute
Teaching language: Czech
Aims of the course unit:
The course focuses on the explanation of the causes of machine-part failures, failure micromechanisms, methods of macrofractographic and microfractographic studies, classification and description of fracture appearance with the aim of making students familiar with the potentials of applying fractography to the solution of practical production problems, breakdowns and their causes, optimisation of materials selection, etc.
Learning outcomes and competences:
The knowledge of failure micromechanisms and methods of studying them. Understanding the relations between the properties of materials, the causes of their failures, and ways of preventing failures. The application of fractography as an important tool in solving production problems and breakdowns.
Prerequisites:
The basic knowledge in the field of materials engineering, with emphasis on the relations between the real structure and performance of materials. In-depth knowledge of limit states, in particular the problems of testing mechanical properties and failure mechanisms. The knowledge of the following experimental methods is also assumed: metallography, scanning electron microscopy, X-ray spectral microanalysis (EDS and WDS), Auger spectroscopy.
Course contents:
Failure causes and effects. Methods of fractographic analysis. Systematization of the concepts. Fracture micromechanisms. Cleavage and ductile fractures. Quasi-cleavage. Fatigue fractures. Creep fractures. Specific types of fracture. Examples of fractures occurring in operation, and procedures used in their examination.
Teaching methods and criteria:
The course is taught through lectures explaining the basic principles and theory of the discipline. Teaching is suplemented by practical laboratory work.
Assesment methods and criteria linked to learning outcomes:
Graded course-unit credit in the form of presenting an assigned or chosen problem before the group of fellow-students.
Controlled participation in lessons:
Compulsory attendance at exercises. Absence from exercises is dealt with by assigning a topic for a written presentation (usually selected papers from literature).
Type of course unit:
    Lecture  13 × 2 hrs. optionally                  
    Laboratory exercise  13 × 1 hrs. compulsory                  
Course curriculum:
    Lecture 1. Fracture causes and results.
2. Methods of fractographic analysis.
3. Methods of fractographic analysis.
4. Systematisation of fractographic concepts and failure micromechanisms.
5. Systematisation of fractographic concepts and failure micromechanisms.
6. Transcrystalline fractures.
7. Intercrystalline fractures.
8. Fatigue fractures.
9. Creep fractures.
10. Corrosion under stress.
11. Special cases of fractures.
12. Special cases of fractures.
13. Methodology for solving the causes of fractures during operation.
    Laboratory exercise 1. Preparation of fracture surfaces for examination by REM and TEM.
2. TEM - Analysing the replicas from preceding exercises.
3-4. Illustration of fracture surfaces on REM.
5. Writing a test on failure micromechanisms.
6. Examples of fractures occurring during operation, and their examination.
7. Course-unit credit.
Literature - fundamental:
1. Fractography, ASM Handbook, Vol. 12, ASM International, 1987, 517 s., ISBN: 978-0-87170-018-6
2. Failure Analysis and Prevention, ASM Handbook, Vol. 11, ASM International, 2002, 1050 s., ISBN: 0-87170-704-7
3. Fatigue and Fracture, ASM Handbook, Vol. 19, ASM International, 1996, 1057 s., ISBN: 0-87170-385-9
Literature - recommended:
1. Mechanical Testing and Evaluation, ASM Handbook, Vol. 8, ASM International, 2000, 998 s., 978-0-87170-389-7
2. Metallography and Microstructures, ASM Handbook, Vol. 9, ASM International, 1996, 1184 s., ISBN: 978-0-87170-706-2
3. Koutský J., Jandoš F., Karel V.: Fractures in steel parts (in Czech)
The study programmes with the given course:
Programme Study form Branch Spec. Final classification   Course-unit credits     Obligation     Level     Year     Semester  
N-MTI-P full-time study --- no specialisation -- GCr 3 Compulsory 2 2 W