636-0924/02 – Degradation Processes of Structural Materials (DPKM)
Gurantor department | Department of Material Engineering | Credits | 10 |
Subject guarantor | prof. Ing. Bohumír Strnadel, DrSc. | Subject version guarantor | prof. Ing. Bohumír Strnadel, DrSc. |
Study level | postgraduate | Requirement | Choice-compulsory |
Year | | Semester | winter + summer |
| | Study language | Czech |
Year of introduction | 2011/2012 | Year of cancellation | 2022/2023 |
Intended for the faculties | FMT | Intended for study types | Doctoral |
Subject aims expressed by acquired skills and competences
Identify degradation processes and their causes
Specify the basic laws that control the degradation processes
Select t the suitable material with high resistivity of degradation process
Ability to calculate the lifetime of components
Establish a critical crack size for the selected types of materials and loading
Set a limit for the characteristics of stress conditions
Teaching methods
Lectures
Individual consultations
Summary
The lecture presents methods of evaluating degradation processes in structural materials. Attention is focused primarily on the analysis of microstructural conditions for the initiation of brittle and ductile fracture, fatigue damage, creep, corrosion damage, stress corrosion cracking, and basic mechanisms of wear on functional surfaces. This analysis is followed by an explanation of the influence of temperature, loading mode and environmental parameters on the initiation of limit states - leading to fracture and the loss of the basic material function, i.e. transfer of the stress-strain field. Methods for evaluating these degradation processes are applied to metals, ceramic materials, polymers and basic types of composite materials. Particular attention is focused on the influence of the size and shape of structural components on the initiation of limit states and methods for assessing the resistance of structural components exposed to the negative effects of degradation processes. The lecture concludes with a presentation of methods for risk estimation of structures – both during the design stage and as part of operational decision-making during service life.
Compulsory literature:
T.L. ANDERSON: Fracture Mechanics, Fundamentals and Applications, CRC Press, NY 1995, 688 s.
F. ELLYIN: Fatigue Damage, crack growth and life predicttion, Champan and Hall, London 1997, 469s.
Recommended literature:
J. ČADEK: Creep in metallic materials, Academia Praha 1988, 376 s.
Way of continuous check of knowledge in the course of semester
E-learning
Other requirements
There are no further special requirements.
Prerequisities
Subject has no prerequisities.
Co-requisities
Subject has no co-requisities.
Subject syllabus:
1. Introduction – basic relations between structure and mechanical properties
2. Changes of structural materials induced by degradation process
3. Basic groups of materials and their degradation processes
4. Fracture by overloading during uniaxial and multiaxial stress
5. Terms of low-energy brittle fracture
6. Conditions of high-energy ductile fracture
7. Mechanisms of initiation and spread of fatigue violation
8. Fatigue damage of components 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 on surfaces
13. Combined effects of some degradation processes
14. Consequences effects of degradation processes in the reliability of components
Conditions for subject completion
Occurrence in study plans
Occurrence in special blocks
Assessment of instruction