653-3004/05 – Damage Processes of Materials (DPMn)

Gurantor departmentDepartment of Materials Engineering and RecyclingCredits6
Subject guarantorprof. Ing. Bohumír Strnadel, DrSc.Subject version guarantorprof. Ing. Bohumír Strnadel, DrSc.
Study levelundergraduate or graduateRequirementCompulsory
Study languageCzech
Year of introduction2022/2023Year of cancellation
Intended for the facultiesFMTIntended for study typesFollow-up Master
Instruction secured by
LoginNameTuitorTeacher giving lectures
STR50 prof. Ing. Bohumír Strnadel, DrSc.
Extent of instruction for forms of study
Form of studyWay of compl.Extent
Full-time Credit and Examination 3+3
Part-time Credit and Examination 18+0

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



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:

. 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. STRNADEL, B. Řešené příklady a technické úlohy z materiálového inženýrství, Ostrava: Ostravské tiskárny, 1998.

Recommended literature:

ANDERSON, T.L. Fracture Mechanics, Fundamentals and Applications, 4th ed. New York: CRC Press, 2017. ISBN-13: 978-1-4987-2813-3.

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.


Other requirements

There are no further requirements.


Subject has no prerequisities.


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

Part-time form (validity from: 2022/2023 Winter semester)
Task nameType of taskMax. number of points
(act. for subtasks)
Min. number of pointsMax. počet pokusů
Credit and Examination Credit and Examination 100 (100) 51
        Credit Credit 30  15
        Examination Examination 70  36 3
Mandatory attendence participation: Elaboration of assigned projects.

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Conditions for subject completion and attendance at the exercises within ISP: Completion of all compulsory tasks within individually agreed deadlines.

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Occurrence in study plans

Academic yearProgrammeBranch/spec.Spec.ZaměřeníFormStudy language Tut. centreYearWSType of duty
2023/2024 (N0719A270004) Materials and technologies for energy industry DTK K Czech Ostrava 1 Compulsory study plan
2023/2024 (N0719A270004) Materials and technologies for energy industry DTK P Czech Ostrava 1 Compulsory study plan
2022/2023 (N0719A270004) Materials and technologies for energy industry DTK P Czech Ostrava 1 Compulsory study plan
2022/2023 (N0719A270004) Materials and technologies for energy industry DTK K Czech Ostrava 1 Compulsory study plan

Occurrence in special blocks

Block nameAcademic yearForm of studyStudy language YearWSType of blockBlock owner

Assessment of instruction

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