OVERVIEW

The objective of this course is to provide the concepts, procedures, decision analysis techniques necessary to design machine elements commonly found in mechanical devices.

LEARNING OUTCOMES

The course aims to provide students of the knowledge and understanding of the criteria of structural design of the main mechanical members.

Teaching methods

Classroom lessons

SYLLABUS/CONTENT

1st part – Fundamentals of machine design

Recalls of statics and kinematics of rigid bodies. Tension and strain in solids. Equilibrium of deformable bodies. Loads diagrams. Area of cross sections. Theory of the beams (subjected to tensile, compression, shear, bending, torsion). Effects superposition. Equation of the elastic line. Conventional structural materials (mechanical properties).

2nd part – Criteria of structural design

Static strength of materials. Ideal or equivalent stress. Strength criteria for ductile materials. Strength criteria for brittle materials. Safety condition: Limit stress, Safety factor, Admissible stress.

Notches and their effect. Elastic and experimental stress concentration factor. Safety condition in presence of notches.

Fatigue in metallic materials. Fatigue spectra.

High cycle fatigue: Wöhler curves; Influence of the mean stress; Notches and their influence; Size factor; Surface factor. Safety condition for stresses of constant amplitude. Safety condition for stresses of variable amplitude: Cumulative damage.

Long columns with central loading. Euler column formula.

RECOMMENDED READING/BIBLIOGRAPHY

Reference books:

De Paulis A., Manfredi E., Costruzione di macchine: Criteri di base e applicazioni principali, Pearson Italia - Milano, 2012

Hibbeler R.C., Meccanica dei solidi e delle strutture: teoria ed applicazioni, Pearson Italia - Milano, 2010

Recommended books:

Vergani L., Meccanica dei materiali, Mc-Graw Hill Companies, 2006

Nerli G., Costruzione di macchine, Noccioli Editore - Firenze, 2005

Shigley J.E., Progetto e costruzione di macchine, 2a ed., McGraw-Hill, 2009

Chirone, E., Tornincasa, S., Disegno tecnico industriale, Ed. Il Capitello - Torino, 2011

Exam Board

MARGHERITA MONTI (President)

FRANCESCO CRENNA

GIOVANNI BERSELLI

ROBERTO RAZZOLI (President Substitute)

Teaching methods

Classroom lessons

LESSONS START

september 25th 2020

Exam description

Written and oral examination. The written test regards the solution of one exercise. The oral examination consists of two questions on theory. A positive evaluation of the written test is necessary condition to access the oral examination.

Exam schedule