logo-polimi
Loading...
Risorse bibliografiche
Risorsa bibliografica obbligatoria
Risorsa bibliografica facoltativa
Scheda Riassuntiva
Anno Accademico 2019/2020
Scuola Scuola di Ingegneria Industriale e dell'Informazione
Insegnamento 097485 - MACHINE DESIGN
Docente Manes Andrea
Cfu 5.00 Tipo insegnamento Monodisciplinare

Corso di Studi Codice Piano di Studio preventivamente approvato Da (compreso) A (escluso) Insegnamento
Ing Ind - Inf (1 liv.)(ord. 270) - MI (363) INGEGNERIA BIOMEDICA*AZZZZ097485 - MACHINE DESIGN
Ing Ind - Inf (Mag.)(ord. 270) - BV (478) NUCLEAR ENGINEERING - INGEGNERIA NUCLEARE*AZZZZ097485 - MACHINE DESIGN
Ing Ind - Inf (Mag.)(ord. 270) - MI (422) INGEGNERIA DELLA PREVENZIONE E DELLA SICUREZZA NELL'INDUSTRIA DI PROCESSO*AZZZZ097485 - MACHINE DESIGN
Ing Ind - Inf (Mag.)(ord. 270) - MI (471) BIOMEDICAL ENGINEERING - INGEGNERIA BIOMEDICA*AZZZZ097485 - MACHINE DESIGN
Ing Ind - Inf (Mag.)(ord. 270) - MI (473) AUTOMATION AND CONTROL ENGINEERING - INGEGNERIA DELL'AUTOMAZIONE*AZZZZ097485 - MACHINE DESIGN
Ing Ind - Inf (Mag.)(ord. 270) - MI (491) MATERIALS ENGINEERING AND NANOTECHNOLOGY - INGEGNERIA DEI MATERIALI E DELLE NANOTECNOLOGIE*AZZZZ097485 - MACHINE DESIGN

Obiettivi dell'insegnamento

The main objective of the course is to provide the students with the necessary tools for the design and assessment of machine components, both under static and fatigue loading. The basics of mechanical design are illustrated in order to include capability to develop simplified structural models, basic theory of elasticity, design methods for static and fatigue loads (multiaxial and variable amplitude loading) and tools for assessing the influence of defects on static and fatigue strength. 


Risultati di apprendimento attesi

Once the students has passed the exam, the students will:

  1. possess the knowledge of the main tools (analytic approach) and methods for modelling structural behaviour of simple machine components/systems;
  2. understand assumptions and limitations of the beforementioned tools and methods;
  3. perform design and assessment of machine components/systems subjected to static and fatigue loading;
  4. analyse and critically discuss the results.

Thanks to the practices that are focussed on case studies (basic optimization technique, bolted and welding joints, basic of gears, pressure vessels, power transmission shafts, static design of a prothesis) the students will improve the skills necessary for practical design applications. Moreover, the theoretical concepts and the case studies will provide together a more general capability to approach an engineering solution of simple problems related to structural design in several fields. These competences are therefore of benefit for a wide range of study courses.  


Argomenti trattati

The course is organized in lectures and tutorials. Theoretical concepts will be applied during application in order to show an engineering approach to the design and assessment of actual and relevant components.

Internal forces: definition of slender members, definition of internal forces and equations of equilibrium, reticular structures;

Axial and bending problem in beams: hypotheses and basic assumptions for the Euler-Bernoulli beam; state of stress due to normal force and bending moment;

Shear in beams: relationship between bending moment and shear force; shear stress distribution in case of solid section; torsion in beam: distribution of torsional stresses for a circular solid beam;

State of stress: definition of equilibrium for deformable bodies; Cauchy tetrahedron; principal stresses and directions; stress invariants; hydrostatic stress tensor and stress deviator tensor; Mohr’s circles for plane stress; three-dimensional description of Mohr’s circles;

Material behaviour: tensile test devices and specimens; engineering stress-strain curve; true stress-strain curve; ductile and brittle failure mechanisms; ideal material models;

Influence of notch for ductile and brittle materials: phenomenological aspects; definition of Kt and Ks parameters.

Stress-strain relations: general expression of the elastic tensor; elastic tensor for isotropic materials; derivation of the generalised Hooke’s law; stress-strain relationships for plane stress and plane strain.

Failure criteria for isotropic materials: Galileo-Leibniz-Rankine-Navier criterion for brittle materials; Guest-Saint Venant-Tresca criterion for ductile materials; Huber-Hencky-von Mises criterion for ductile materials; general considerations about the definition of the safety factor;

Fatigue: fatigue phenomena; fatigue testing; definition of fatigue cycles; Wöhler diagram; finite and infinite life regime; relationship between fatigue limit and tensile strength; influence of mean stress with Haigh diagrams; notch effect on fatigue; influence of surface finishing; size effect and influence of stress gradient; damage accumulation with Miner-Palmgren rule; Gough-Pollard and Sines criteria for multi-axial loading condition.

 


Prerequisiti

Who is going to attend the course is expected to have rooted bases in mathematics, physics.


Modalità di valutazione

The exam is based on a written test followed by oral one. Written exam is compulsory and cover all the topics of the course. Oral exam is voluntary and possible only in case written exam has been positively passed; oral exam can modify the score of +- 3 points and have to be carried out in the same exam session of the written one. The written test will include the solution of numerical exercises, aimed at assessing the capability of application of the design tools to practical cases and questions aimed at assessing the knowledge of the theoretical topics included in the program. The oral test will prove also the capability of critically discuss the design tools and their limits and or applicability conditions. Practical exercises can be also requested during oral exam.


Bibliografia
Risorsa bibliografica facoltativaNorman E. Dowling, Mechanical Behavior of Materials, ISBN: 978-0131395060
Risorsa bibliografica obbligatoriaLecture notes by the teacher (english) Beep
Risorsa bibliografica obbligatoriaAA. VV, Costruzione di Macchine, Editore: McGraw Hill
Note:

(italian language)


Forme didattiche
Tipo Forma Didattica Ore di attività svolte in aula
(hh:mm)
Ore di studio autonome
(hh:mm)
Lezione
30:00
45:00
Esercitazione
20:00
30:00
Laboratorio Informatico
0:00
0:00
Laboratorio Sperimentale
0:00
0:00
Laboratorio Di Progetto
0:00
0:00
Totale 50:00 75:00

Informazioni in lingua inglese a supporto dell'internazionalizzazione
Insegnamento erogato in lingua Inglese
Disponibilità di materiale didattico/slides in lingua inglese
Disponibilità di libri di testo/bibliografia in lingua inglese
Possibilità di sostenere l'esame in lingua inglese
Disponibilità di supporto didattico in lingua inglese
schedaincarico v. 1.6.1 / 1.6.1
Area Servizi ICT
28/01/2020