Ing Ind - Inf (Mag.)(ord. 270) - LC (485) MECHANICAL ENGINEERING - INGEGNERIA MECCANICA
051584 - LIGHTWEIGHT DESIGN OF SMART MECHANICAL SYSTEMS
Current and future trends in the design of mechanical structures are focused on mass reduction and systems integration. In this perspective, the course aims to enable students, by giving the proper theoretical and practical information, to face these problems. In particular the students will learn the fundamentals of FEM theory and will be guided in the application of FEM by means of commercial software applications. Practical design applications will be a relevant part of the course.
Risultati di apprendimento attesi
The students will learn the fundamentals of the teory of FEM (DD1) and this will enable them to apply commercial softwares to practical design applications (DD2) with the capability to critically judge the results of the simulations (DD3). A technical report describing the practical design applications will be issued by the students to develop communication skills (DD4).
The students will learn to deal with advanced FEM applications including contact problems and non linear materials. Composite materials will be also considered.
The first part of the course is devoted to the study of the Finite Element Method as a tool for mechanical design. The course starts from the basics principles of the method and covers some advanced topics such as contact, non linear and stability analysis. State of the art commercial software will be used.
Lightweight materials, such as composite and rubber like materials, will be discussed in the second part of the course. Finite elements analysis and structural optimization of such materials will be presented by practical examples.
Design of smart structures for diagnostic and load sensing will be considered with reference to metallic and composite materials. Practical applications will be shown.
In the last part, the course will focus on the life cycle analysis of the components and the corresponding design techniques.
Practical lessons and seminars will be proposed to show the practical application of the theoretical concepts discussed in class.
A –Finite Element Method – basics: Definition of the method and hypothesis. Understanding of the results. Element formulations and properties. 1-D, 2-D and 3-D problems. Solution techniques.
B –Finite Element Method - advanced: Geometric nonlinearity, contacts, non linear materials (hyperelasticity, plasticity, damping, viscoelasticity), instabilities (buckling).
C -Optimal design: Principles of Multi-Objective Design, formulation of the problem, variable and objective definition, solution of a multi-objective problem. Topological structural optimization. Application.
D -Advanced materials: Basic properties of composites and other non metallic materials. Finite element implementation and optimization of structures in composite materials.
E –Smart structures: Principle and implementation. Structures for diagnostic and load sensing. Examples.
F –Life cycle assessment: Design principles. Life cycle design. Eco-design.
The topics typically studied in the courses of Machine Design 1 and 2 will be a prerequisite. They include the knowledge of the kinematics and statics of structures, stress and strains analysuis, beam theory, fatigue in monoaxial and multiaxial conditions.
Modalità di valutazione
The exam consists of an oral discussion. A report of the practical applications developped during the course has to be produced to participate in the oral exam: it will demonstrate the capability of the students to write a technical report and it will provide a basis for the discussion that will be developed in the oral exam.
The oral exam will focus both the theoretical aspects, learned with the lectures, and the capability of critical application.
Course noteshttps://beep.metid.polimi.it/R.D. Cook, Finite Element Modeling for Stress Analysis, Editore: John Wiley and Sons, Anno edizione: 1995, ISBN: 0471107743
O.C. Zienkiewicz, R.L. Taylor, The finite element method. The basis, Editore: Butterworth-Heinemann, Anno edizione: 2005, ISBN: 9780080472775
Mastinu, Gobbi, Miano, Optimal Design of Complex Mechanical Systems, Editore: Springer, Anno edizione: 2006, ISBN: 978-3-540-34355-4
D. Hull, An introduction of composites materials, Editore: Cambridge University Press, Anno edizione: 1996
Tipo Forma Didattica
Ore di attività svolte in aula
Ore di studio autonome
Laboratorio Di Progetto
Informazioni in lingua inglese a supporto dell'internazionalizzazione
Insegnamento erogato in lingua
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