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Material testing and degradation mechanisms

* Exchange students do not have to consider this information when selecting suitable courses for an exchange stay.

Course Unit Code636-2015/01
Number of ECTS Credits Allocated4 ECTS credits
Type of Course Unit *Choice-compulsory type A
Level of Course Unit *First Cycle
Year of Study *Third Year
Semester when the Course Unit is deliveredWinter Semester
Mode of DeliveryFace-to-face
Language of InstructionCzech
Prerequisites and Co-Requisites Course succeeds to compulsory courses of previous semester
Name of Lecturer(s)Personal IDName
LAS40doc. Ing. Stanislav Lasek, Ph.D.
STR50prof. Ing. Bohumír Strnadel, DrSc.
Summary
Basic mechanical tests of engineering materials in relationship with the action of various degradation processes. Principal kinds of engineering materials failure. Testing of mechanical overloading in the case of ductile fracture. Principles and testing of resistance to fatigue failure, creep, corrosion, stress corrosion cracking and to basic mechanisms of wear of functional surfaces. Methods of evaluation of experimental results and their interpretation.
Learning Outcomes of the Course Unit
Student will be able:
- to characterize principal methods of materials testing to evaluate materials properties;
- to describe the most important mechanisms of material degradation;
- to choose appropriate methods to evaluate resistance of materials to degradation processes.
Course Contents
1. Importance of material testing. Tensile test, evaluation of principal characteristics; hardness testing.
2. Methods of toughness evaluation. Definition of toughness; influence of loading rate; influence of stress concentration; notch toughness test; temperature dependence of toughness, relation to the structure.
3. Material degradation during service. Principles of degradation, high/low energy fractures. Mechanism of ductile fracture, mechanisms of brittle fracture.
4. Fracture mechanics. Basic principles, elastic solution – Griffith’s relation; elastic-plastic solution – Griffith-Orowan’s relation; stress intensity factor; fracture toughness.
5. Fatigue of materials. Cyclic stress and strain; initiation and growth of fatigue cracks; life curves; factors influencing resistance to fatigue; methods of evaluation of resistance to fatigue damage.
6. Corrosion degradation of materials. Electrochemical corrosion; anodic/catodic reactions; Pourbaix’s diagrams; Faraday’s law, corrosion rate; passivity of metals; local corrosion; methods of evaluation of materials resistance to corrosion.
7. Creep degradation of materials. Influence of stress and temperature; the most important creep mechanisms; Larson-Miller parameter; methods of evaluation and extrapolation of experimental data.
8. Wear of materials. Adhesive, abrasive, erosive wear; main parameters; materials testing.
9. Radiation degradation of materials. Radiation strengthening/embrittlement; photo degradation of polymers.
10. Non-destructive material testing.
Recommended or Required Reading
Required Reading:
[1] CALLISTER D. W., Materials Science and Engineering. An Introduction. University Iowa, John Wiley Sons, 2007,721.
[1] STRNADEL, B. Nauka o mateiálu II. Degradační procesy a design konstrukčních materialů. ES VŠB-TU Ostrava, 2008, 280 s.
[2] KOUTSKÝ J., Degradační procesy a predikce životnosti. ZU Plzeň (skripta), 1995, 167 s.
Recommended Reading:
[1] FELBECK, D. K., ATKINS A.G.: Strength and Fracture of Engineering Materials. Prentice Hall, Englewood, 1984, 542 s.
[1] POKLUDA J. aj. Mechanické vlastnosti a struktura pevných látek. PC-DIR, Brno, 1994, 385 s.
[2] HERNAS A. a kol., Žárupevné oceli a slitiny. VŠB-TU Ostrava, 2009, 389 s.
Planned learning activities and teaching methods
Lectures, Seminars, Tutorials, Experimental work in labs
Assesment methods and criteria
Task TitleTask TypeMaximum Number of Points
(Act. for Subtasks)
Minimum Number of Points for Task Passing
Credit and ExaminationCredit and Examination100 (100)51
        CreditCredit30 15
        ExaminationExamination70 36