The aim of the course is for students to acquire knowledge regarding the behavior of materials in exploitation (i.e. under conditions of creep, fatigue, residual stresses and corrosion), their reliability during exploitation, as well as factors determining their reliability. The basic goal of the course is for students to recognize the complexity of the relation material – working parameters – working environment with all consequences that can follow, causes of fractures in constructions and loss of reliability in use. They should also be able to understand the precautions necessary for achieveing reliability during use.

Upon the successful completion of the course, students are able to: - relate the acquired knowledge in the field of material science and damage mechanisms; - solve specific problems in the fields of detecting and recognizing damages in metallic structures and their influence on reliability of structure; - determine the potential causes of damage and perceive possibilities of there modelling, as well as possibilities of modelling the reliability of constructions with damage; - perceive the eventual possibilities for preventing the occurrence of damage; - define the testing programme for detecting damages in mechanical structures; - relate the acquired knowledge to other fields, with practical applications.

Big failures and construction fractures worldwide. Tetrahedron material/construction – working environment – working parameters – reliability. Reliability. Fundamentals of theory of creep, resistance of materials to creep, relevant factors, mechanisms of developing damage under creep conditions, material degradation, development of pores, cracks, crack propagation and fractures. Fatigue, relevant factors especially concerning materials and material faults, nucleation of cracks, their propagation in different environments and fractures. Residual stresses and their significance, types of residual stresses and their influence on material properties, techniques for measuring and procedures for reducing them. Corrosion, types of corrosion, mechanisms of corrosion, corriosion damage tendency of materials in different environments and destruction due to corrosion and combined mechanisms. Methods for assessing lifetime and increasing reliability.

Metallography. Calculating coefficient of stress concentration in presence of defects. Probability of fracture occurrence. Types of fractures. Creep strenght. Degradation in microstructures. Examples of corrosion damage. Analytical diagnostics. Writing of reports. Criteria for replacement and reparation. Technical norms. New steels for high temperatures.

Obtained master degree (M.Sc.) and knowledge about material science.

1. Basic mechanisms of mechanical structures damages (in Serbian), Gordana Bakić, Miloš Đukić, Vera Šijački Žeravčić, University of Belgrade, Faculty of Mechanical Engineering, Belgrade, 2021, ISBN: 978-86-6060-069-3 2. Chadek Ya: The Creep of metal Materials, Moscow, Mir, 1987 3. Ridel H.: Fracture at High Temperature, Berlin, Heidelberg: Springer-Verlag, 1987, ISBN: 978-3-642-82963-5 4. M. G. Fontana, Corrosion engineering, McGraw, Hill International Editions, 1987, ISBN: 0-07-021463-8 5. I. Milne, R.O. Ritchie and B. Karihaloo: Practical failure assessment method, Comprehensive Structural Integrity, Vol 7, Elsevier, 2003, ISBN: 9780080437491 6. D.R.H.Jones, Failure analysis case studies, Elsevier Science, 2001, ISBN: 0080439594

Total assigned hours: 65

New material: 45
Elaboration and examples (recapitulation): 5

Auditory exercises: 0
Laboratory exercises: 0
Calculation tasks: 0
Seminar paper: 0
Project: 0
Consultations: 0
Discussion/workshop: 0
Research study work: 0

Review and grading of calculation tasks: 0
Review and grading of lab reports: 0
Review and grading of seminar papers: 10
Review and grading of the project: 0
Test: 0
Test: 0
Final exam: 5

Activity during lectures: 0
Test/test: 0
Laboratory practice: 20
Calculation tasks: 0
Seminar paper: 40
Project: 0
Final exam: 40
Requirement for taking the exam (required number of points): 0

Basic mechanisms of mechanical structures damages (in Serbian), G. Bakić, M. Đukić, V. Šijački Žeravčić, University of Belgrade, Fac. of Mechanical Engineering, Belgrade, 2021, ISBN:978-86-6060-069-3 ; Milnie, Ritchie et.al: Cyclic Loading and fatigue, Comprehensive Structural Integrity, Vol 4, Elsevier, 2003, ISBN: 0080441556 ; Milnie, Ritchie et.al: Creep and high-temperature failure, Comprehensive Structural Integrity, Vol 5, Elsevier, 2003, ISBN: 0080441548; Corrosion of Thermal Power Plants (in Serbian), Monograph – Fac. of Technology and Metallurgy, Fac. of Mechanical Engineering, Nuclear Institute Vinča, Electric Power Industry of Serbia, 2002.; V. Šijački Žeravčić: Residual stresses (in Serbian) – Monography, Fac. of Mech.Eng. Belgrade, 1999, ISBN: 86-7083-338-7