Teacher

prof. Francesco DE BONA

Credits

6 CFU

Language

Italian

Objectives

Providing basic tools to:

• perform the design of machine components;
• understand models and solutions usually applied by mechanical engineers to the static and fatigue analysis of mechanical structures;
• perform stress and deflection analysis of structural elements by means of numerical and experimental approaches.

Acquired skills

- Being able to select the most suitable approach to perform a structural analysis.
- Performing stress and deflection analysis of a structural mechanical component.
- Providing a diagnosis of the failure modes of a mechanical structure.

Lectures and exercises (topics and specific content)

Introduction: static failure of brittle and ductile materials; safety coefficient (2 hours).
Fatigue: basic concepts; fatigue strength; Woehler curve; failure analysis; parameters affecting fatigue strength; Smith and Goodman diagram; lifetime computation cumulative damage (12 hours).
Notch effect: notched geometries; stresses, theoretical, nominal and actual; notch coefficients (6 hours).
Machine elements: structural analysis on: transmission shafts, ball bearings,  gears, curved beams, springs tubes (16 hours).
Experimental strain analysis: photoelasticity (2 hours).
Numerical methods: introduction to FEM (6 hours).
Exercises: numerical examples (16 hours).

References

- A. Strozzi, Appunti del Corso di Costruzione di Macchine, Pitagora, 1998
- R. C. Juvinall, K.M.Marshek, Fondamenti della Progettazione dei Componenti delle Macchine, Edizioni ETS, Pisa, 1993
- J. E.Shigley, C.R. Mischke, Mechanical Engineering Design, Mc Graw-Hill, 1989
- G. Niemann, Elementi delle Macchine, Springer-Verlag, 1981
- R. J. Roark, W.C.Young, Formulas for Stress and Strain, Int. Student Edition, 1976
- R. E. Peterson, Stress Concentration Factors, J.Wiley &Sons, 1974
- J. A. Collins, Failure of Materials in Mechanical Design, J.Wiley &Sons, 1980
- J. E. Shigley C.R. Mischke D.Budynas Progetto e costruzione di macchine, McGraw Hill 2006

Type of exam

Written and oral

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