Course detail
Limit States of Materials and Structures
FSI-6MS Acad. year: 2020/2021 Winter semester
Designing machines, vehicles, and structures that are safe, reliable, and economical requires both efficient use of materials and assurance that structural failure will not occur. It is therefore appropriate for undergraduate engineering majors to study the mechanical behaviour of materials, specifically such topics as deformation, fracture, and fatigue. This course reviews also micromechanics and micromechanical aspects of brittle fracture, fatigue failure and creep rupture. Fracture mechanics. Application of fracture mechanics for integrity assessment of machine parts and structures with cracks under static, cyclic and creep loading. The influence of size effect and loading conditions on fracture toughness of materials.
Language of instruction
Czech
Number of ECTS credits
4
Supervisor
Learning outcomes of the course unit
The course enables the students to get an overview of the principle, way of measurement, as well as practical application of mechanical characteristics of engineering materials.
Prerequisites
Introductory university course in math, chemistry, physics and material science.
Planned learning activities and teaching methods
The course is taught through lectures explaining the basic principles and theory of the discipline. Teaching is suplemented by practical laboratory work.
Assesment methods and criteria linked to learning outcomes
The course-unit credit is awarded on condition of meeting the following requirements: participation in all exercises, elaborating protocols according the teacher’s instructions.
The graded course-unit credit is awarded upon the following conditions: participation on all exercises, elaboration of protocols according to the teacher’s instructions and passing through a test succesfuly. Test consists of two parts: (i)theoretical item, (ii) an examples solved during the exercises. In this part of the test is allowed to use the notes from the lectures, as well as protocols of exercises.
Examination: The exam consists of two parts: (i) written and (ii) oral. In the written part of the exam the student elaborates three questions: (i) theoretical item, (ii) an example solved during the exercises. In this part of the exam is allowed to use the notes from the lectures, as well as protocols of exercises. In the oral part the student explains the theoretical item and describes the way of solving the examples, including relationships and assumptions he/she has utilized.
Aims
The course is focused on the methods for securing the integrity of mechanical equipment and design. Methods consist of two parts: (i) calculation as such, and (ii) the estimation the material resistance against failure. The aim of this course is to explain the principle of evaluation of material resistance against failure by means of basic material characteristics (yield stress, fracture toughness, or time to rupture curve).
This subject is included into study plan of 3rd year of general bachelor's study as a compulsory-optional one. It is recommended as a prerequisite of branches M-ADI, M-FLI, M-IMB, M-MTI, M-MET or M-PRI.
Specification of controlled education, way of implementation and compensation for absences
The exercises are compulsory and the absence from these exercises must be properly excused. In case of absence the student is required to elaborate a protocol in order to prove that he/she understands the topic.
The study programmes with the given course
Programme B3S-P: Engineering, Bachelor's
branch B-KSB: Quality, Reliability and Safety, compulsory-optional
Programme B3S-P: Engineering, Bachelor's
branch B-STI: Fundamentals of Mechanical Engineering, compulsory-optional
Type of course unit
Lecture
26 hours, optionally
Teacher / Lecturer
Syllabus
Historical perspective (the Liberty ships, the Comet aircraft, recent trends in fracture research)
Elastic deformation (bonding and structure in materials, trends in elastic modulus values)
Plastic deformation (discussion of plastic deformation)
Plastic deformation (engineering stress-strain properties)
Time-dependent behaviour (creep and damping)
Fracture of flawed bodies – fracture toughness values KIc and Gc
Extensions of fracture mechanics beyond linear elasticity – fracture toughness values JIc and CTOD
Brittle fracture of steel – transition temperatures approach
Brittle fracture of steel – fracture toughness approach
Fatigue of materials – introduction and stress-based approach
Fracture behaviour ceramic and polymers
Damage tolerance methodology
Workshop
Laboratory exercise
26 hours, compulsory
Teacher / Lecturer
Syllabus
1 Introduction, laboratories exkursion, Internet – search for standards, material characteristics and scientific papers
2 Elastic deformation – discussion and examples
3 and 4 Plastic deformation – discussion and examples
5 and 6 Transition fracture behaviour of steel – discussion and examples
7 and 8 Fracture mechanic – discussion and examples
9 Fatigue of metals – discussion and examples
10 Creep and creep fracture – discussion and examples
11 Case studies – metals
12 Case studies – plasts, ceramics
13 Case studies and credit