Limit States of Materials and Structures (FSI-6MS-A)

Academic year 2020/2021

Supervisor:	prof. Ing. Ivo Dlouhý, CSc.
Supervising institute:	ÚMVI	all courses guaranted by this institute
Teaching language:	English
Aims of the course unit:
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.
Learning outcomes and competences:
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.
Course contents:
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.
Teaching methods and criteria:
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.
Controlled participation in lessons:
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.
Type of course unit:
Lecture	13 × 2 hrs.	optionally
Laboratory exercise	13 × 2 hrs.	compulsory
Course curriculum:
Lecture	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	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

Literature - fundamental:
1. Anderson T.L:: Fracture Mechanics, Fundamentals and Applications, CRS Press 1995
2. Ashby F.M.- Jones D.R.H.:: Engineering Materials I,II,Pergamon Press 1995
3. Dowling E.N.: : Mechanical Behaviour of Materials,Prentice Hall International Editions 1993
Literature - recommended:
1. Veles P.: : Mechanické vlastnosti a skúšanie kovov,ALFA, SNTL 1985
2. Vlach B.:: Mezní stavy materiálu,http://www.zam.fme.vutbr.cz/~vlach/
3. Strnadel B.:: Řešené příklady a technické úlohy z materiálového inženýrství ,skripta VŠB, dostupné v areálové knihovně