DESIGN AGAINST FATIGUE
DAF, E111069, 1+1, a, ex, 2 credits
TARGET
- Educate the basics of design and calculation of mechanical parts and structures against fatigue damage and fracture.
- Educate the basic theory of the Finite Element Method, modeling and calculation of simple machine parts
CONTENT:
FEM:- Minimum of potential energy approach in structural/continuum mechanics. Examples of rods and beams.
- Essentials of matrix algebra and matrix formulation of simple bar structure. Finite element formulation of the structure.
- General finite element method. Discretization of 2D continuum, element and global operators, mechanical and thermal loads.
- Finite element discretization of 2D and 3D continuum, axisymmetric structures.
- Utilization of FEA in modeling of parts and assemblies of structures.
Lecturer: Doc. M. Španiel:
Fatigue:- Static and cyclic characterization of materials, hysteresis loop.
- Fatigue stress-life curves, fatigue strain-life curves, mean stress effect – Haigh’s and Smith’s diagrams.
- Stress concentration, notch factor, cracks and stress intensity factor, other fatigue degradation factors.
- Design of machine parts for unlimited life, safety factor, probability of fracture.
- Decomposition of stochastic process, Rain-flow method, loading histograms (loading spectra), experimental verification of fatigue life.
- Fatigue damage, accumulation of damage, linear and nonlinear damage hypothesis (Miner’s rule, Corten-Dolan, SWT – parameter)
- Approaches for fatigue life prediction. Design of machine parts for limited life, safety factor, probability of fracture.
- Basic of fracture mechanics and crack growth under cyclic loading.
- Suresh, S.: Fatigue of Materials. Cambridge Univ. Press, 2nd ed., 1998. ISBN 0 521 57046 8
- Stephens, R.I-Fatemi, A.- Stephens R.R. and Fuchs, H.O: Metal fatigue in engineering, Wiley-Interscience, 2nd ed., 2000, ISBN:978-0471510598
- Bathe, K. J.:Finite Element Procedures, Prentice Hall, New Jersey, 1996
- Zienkiewicz, O.C.-Taylor, R.L.: The Finite Element Method. Fifth Edition, Butterworth-Heinemann, 2000, ISBN:0 7506 5049 4