Physical Base of Materials Fracture
FSI-9FZMAcad. year: 2020/2021
Diffences between processes of deformation and fracture, and between resulting mechanical properties of metals, ceramics and polymers, come from their different microstructure. The course includes passages dealing with the microstructure of basic material types and describing individual damage stages leading to the fracture under various external conditions. The emphasize is given on the understanding of physics of micromechanisms operating in the individual fracture processes and on relationships between microstructure and mechanical characteristics of materials. It enables us to make qualified decisions about the suitabillity of a given structural material based on its microstructural and mechanical characteristics and, in particular, to assess the risk of fracture of structural components during their exploitation.
Presentation is made by combination of computer animation and classical methods (overheads and blackboard.
Learning outcomes of the course unit
Graduates accuire knowledge about the microstructure, capabilities and limits of mechanical properties of basic kinds of materials for the purposes of engineering design and technology. They gain a valuable experience with a physical view on the world of engineering materials. Moreover, they would better understand microscopical processes operating during their fracture.
Fundaments of physics, chemistry, mathematics and materials engineering.
Recommended optional programme components
Recommended or required reading
J. Pokluda, F. Kroupa, L. Obdržálek: Mechanické vlastnosti a struktura pevných látek. PC DIR Brno, 1994.
A. Kelly, N. H. Macmillan: Strong Solids. Clarendon Press Oxford 1986. (EN)
P. Kratochvíl, P. Lukáč, B. Sprušil: Úvod do fyziky kovů I. SNTL/ALFA Praha.
J. Menčík: Pevnost a lom skla a keramiky. SNTL Praha 1990
B. Meissner, V. Zilvar: Fyzika polymerů. SNTL/ALFA Praha 1987.
S. Suresh: Fatigue of Materials. Cambridge Univ. Press, 1998. (EN)
J. Pokluda, P. Šandera: Micromechanisms of Fracture and Fatigue: In a Multiscale Context. kniha, Springer, London 2010. (EN)
A. Saxena: Advanced Fracture Mechanics and Structural Integrity, CRC Press 2019 (EN)
Planned learning activities and teaching methods
The course is taught through lectures explaining the basic principles and theory of the discipline.
Assesment methods and criteria linked to learning outcomes
Knowledge of the subject matter at least in the range of the reference No. 1. Examination in the form of the test.
Language of instruction
The aim of the course is to present a physical interpretation of differences between mechanical properties of metals, ceramics and polymers and, in particular, to mention a possibility of quantitative description of some common deformation and fracture micromechanisms. Students are guided to a physical art of thinking about fracture processes in materials.
Specification of controlled education, way of implementation and compensation for absences
The presence on seminars is recommended but not obligatory.
Classification of course in study plans
Type of course unit
20 hours, optionally
Teacher / Lecturer
1. Structure of materials
1.1 Bonds in solids
1.2 Structure of perfect crystals
1.3 Crystal defects
1.4 Structure of polymers
2. Deformation of metals
2.1. Elastic and anelastic deformation
2.2 Plastic deformation
2.3 Theory of strengthening
3. Fracture of metals
3.1 Fundaments of fracture mechanics
3.2 Ductile fracture
3.3 Brittle fracture
3.4 Stress corrosion cracking
3.5 Fatigue fracture
3.6 Creep fracture
4. Deformation and fracture of ceramics
4.1. Deformation of monocrystals
4.2. Deformation of polycrystals
4.3. Strength and fracture toughness
4.4. Fracture after long-term degradation
5. Deformation and fracture of polymers
5.1. Micromechanisms a phenomenology of deformation
5.2. Mechanical properties and fracture of basic polymer types