636-3004/03 – Damage Processes of Materials (DPMn)
| Gurantor department | Department of Material Engineering | Credits | 6 |
| Subject guarantor | prof. Ing. Bohumír Strnadel, DrSc. | Subject version guarantor | prof. Ing. Bohumír Strnadel, DrSc. |
| Study level | undergraduate or graduate | Requirement | Compulsory |
| Year | 1 | Semester | summer |
| | Study language | Czech |
| Year of introduction | 2019/2020 | Year of cancellation | 2022/2023 |
| Intended for the faculties | USP, HGF, FMT, FEI | Intended for study types | Follow-up Master |
Subject aims expressed by acquired skills and competences
- Identify degradation processes and their causes
- Specify the basic laws that control the degradation processes
- Ability to calculate the lifetime of components
- Establish a critical size for the selected types of defects in materials and methods of stress
- Set a limit for the characteristics of stress conditions
Teaching methods
Lectures
Tutorials
Summary
The lecture introduces students to basic methods of evaluation of degradation processes in structural materials. Analyses of microstructural conditions of brittle and ductile fracture initiation, fatigue damage, creep, corrosion damage, corrosion cracking and principle mechanismus of wear of service surfaces are presented. These analyses are followed by comments of effects of temperature, loading mode and environmental parameters on limited state finished by fracture and loss of general function of material consist in bearing stress-strain field. The whole lecture of initiation and propagation mechanisms of degradation processes is aimed on solution of technical problems how to improve reliability and safety of structural parts.
Compulsory literature:
STRNADEL, B. Degrading processes of materials. Ostrava: VŠB-TU Ostrava, 2015.
KASSNER, M. E.: Fundamentals of Creep in Metals and Alloys, Elsevier Science, 2nd edition, 2012, 295p.
LEE, Y. L., PAN, J., HATHAWAY, R., BARKEY, M.: Fatigue Testing and Analysis, Butterworth-Heinemann, 3rd edition, 2014, 416p.
LAMON, J.: Brittle Fracture and Damage of Brittle Materials and Composites, ISTE Press – Elsevier, 2016, 296p.
SUN, C.T., JIN, Z.: Fracture Mechanics, Academic Press, 1st edition, 2017, 296p.
Recommended literature:
ANDERSON, T.L. Fracture Mechanics, Fundamentals and Applications, 4th ed. New York: CRC Press, 2017. ISBN-13: 978-1-4987-2813-3.
Additional study materials
Way of continuous check of knowledge in the course of semester
Continuous verification of learning outcomes:
full-time study form – 2 x written tests at exercises, 2 x discussion seminar at lectures during the semester;
combined study form – 1 x test during the semester.
Final verification of study results:
written and oral exam - the aspirant draw up a report.
E-learning
Other requirements
There are no further requirements.
Prerequisities
Subject has no prerequisities.
Co-requisities
Subject has no co-requisities.
Subject syllabus:
Lectures:
1. Introductory lecture
2. Changes of structural materials induced degradation process
3. Basic groups of materials and their degradation processes
4. Refraction of congestion during uniaxial and multiaxial stress
5. Terms of brittle fracture of low-energy
6. Conditions of high-energy ductile fracture
7. Mechanisms of initiation and spread of fatigue violation
8. Fatigue damage components when exposed to multiaxial stress
9. Mechanisms of creep damage initiation
10. Fracture during the creep and factors that influence it
11. Mechanisms of stress corrosion cracking and hydrogen embrittlement
12. The basic mechanisms of wear surfaces
13. Combined effects of some degradation processes
14. Consequences effects of degradation processes in the reliability of components
Exercise:
1. Introductory training, requirements, a summary study of literature,
summary of the basic knowledge of physics of metals, continuum mechanics and physics metallurgy required for mastering the subject.
2. Classification of the effects of degradation processes, a general assessment of reduction expected life of components when exposed to degradation processes, examples of reliability evaluation of components.
3. Comparison of the effects of exposure degradation processes in different
groups construction materials in terms of loss of basic functions and material reduction of reliability in practical examples.
4. Worked examples of the limit state quarry material breach Overload in uniaxial and multiaxial stress.
5. Calculations transit temperatures and lower limits of temperature
dependence of fracture toughness for the quantification of safety components against the formation of low-energy fracture.
6. Calculations of strength of structural materials at elevated temperatures and optimization of microstructural parameters.
7. Solution of basic technical tasks during the life of components
time-varying loads and estimates of residual life.
8. Calculations of the components loaded multi-axis time variable stress-
deformation field.
9. Solving basic technical problems of safety and durability of steel structures exposed at elevated temperatures.
10. Solving some problems of functional wear surfaces, particularly adhesion, for selected timing mechanisms volumetric wear. Optimization of pressure
strength and relative speed of functional surfaces.
11. Calculations of heavy-duty components or two or more degradation
processes at the same time, the combined effects of elevated temperature
exposure and cyclic stress on the safety components.
12. Solving some technical problems of reliability of structural materials when exposed to degradation processes associated with optimizing microstructure parameters.
13. Test.
14. Checking test results, credit.
Conditions for subject completion
Occurrence in study plans
Occurrence in special blocks
Assessment of instruction