Course: Fatigue of Structures and Materials

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Course title Fatigue of Structures and Materials
Course code KMP/DPZ
Organizational form of instruction Lecture + Lesson
Level of course Master
Year of study not specified
Semester Summer
Number of ECTS credits 5
Language of instruction Czech, English
Status of course Compulsory
Form of instruction Face-to-face
Work placements Course does not contain work placement
Recommended optional programme components None
Course availability The course is available to visiting students
  • Votrubec Vlastimil, Ing. Ph.D.
  • Petríková Iva, doc. Ing. Ph.D.
Course content
1. Introduction to fatigue of structures and materials. Types of limit states. Mechanisms of fatigue damage of materials. Fatigue design criteria - infinite-life, safe-life, fail-safe, damage tolerant. 2. Material properties of quasi-static and cyclic loading, hysteresis loop, cyclic stress-strain curve, Ramberg-Osgood approximation. 3.S - N curve (W?hler curve). Effects on fatigue strength: shape effect, size, surface quality, stress gradient, temperature, frequency. 4. Effect of mean stress, Haigh diagram, Smith diagram, equivalent stress (amplitude) of oscillation. 5. Effect of notches in the area of high-cycle fatigue. Stress concentration factor, notch factor. Methods for the determinations of stress concentrations. 6. Manson-Coffin curve - determination, display, parameters, description. Stress concentration at notches in the area of low cycle fatigue, coefficients of stress and strain concentration, Neuber rule, Glink rule, determination of fatigue strength coefficient and deformation in the notches. 7. Classification (distribution) of oscillatory loads, stochastic load. Methods of stochastic process sorting - one-parametric and multiparametric methods, rain-flow methods and others. 8. Design for unlimited lifetime: nominal approaches. Design for a limited lifetime: nominal stress approach. Factors of safety (reliability). Probability of failure. 9. Basic principles of prediction of lifetime according to local elastic stresses. Approach according to local plastic stresses and deformations, damaging parameters, calculation procedure. 10. Introduction to linear fracture mechanics - principles, Stress concetration factor K, fracture toughness. 11. Non-linear fracture mechanics. Plastic zone at the front of the crack, Correction K. 12. Statistical procedures for evaluation of fatigue tests, single-and multi-level tests, parameters regression. 13.-14. Application examples.

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Recommended literature
  • JÁGROVÁ, Jitka a Lukáš ČAPEK. Liberec: Technická univerzita v Liberci, 2017. ISBN 978-80-7494-366-9..
  • SCHIJVE, Jaap. Fatigue of structures and materials. 2nd ed. S.l.: Springer, 2009. ISBN 978-1-4020-6807-2..
  • STEPHENS, R. I, Ali FATEMI, Robert S. STEPHENS a H.O. FUCHS. Metal fatigue in engineering. Second edition. New York: Wiley-Interscience, 2001. ISBN 0-471-51059-9..

Study plans that include the course
Faculty Study plan (Version) Category of Branch/Specialization Recommended year of study Recommended semester