Ing Ind - Inf (Mag.)(ord. 270) - BV (469) AERONAUTICAL ENGINEERING - INGEGNERIA AERONAUTICA

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099255 - AEROSPACE STRUCTURES

Obiettivi dell'insegnamento

Specific formative objectives

The course illustrates the fundamental concepts of structural analysis as applied to aerospace structures and provides a picture of the different problems involved in the analysis and design of aerospace structures. Typical models and techniques employed in the design of aircraft and space constructions are described. The modeling of thin-walled beams and plate-like constructions is discussed along with different solutions strategies for evaluating their linear static response, including the Finite Element method. Since buckling phenomena are of particular interest in aerospace structures part of the course is devoted to the stability of elastic equilibrium.

The student should develop the skills necessary to: perform preliminary analyses of typical aerospace structural configurations using models of increasing complexity; critically choose the methods of analysis and assess the quality of the results.

Risultati di apprendimento attesi

After succeeding this course, the student should have:

learned the typical configurations of aerospace structures

understood the role played by different structural members

mastered the theoretical aspects of structural models and classical analysis techniques

and be capable of:

performing preliminary calculations for the linear stress analysis of aerospace structures

using and developing some numerical tools for analyzing the linear response of truss-, beam- and plate-like structures

critically evaluating the adequacy of the analysis tools (structural models and solution strategies) in relation to the problem at hand

critically assessing the results of a structural analysis

writing technical relations and discussing verbally results and analysis techniques

Argomenti trattati

1. Aerospace structures: Introduction. Overview of spacecraft and aircraft structures.

2. Continuum mechanics: General formulation of continuum mechanics. Stress and strain measures. Balance equations. Elastic problem for small strain and displacements. Variational principles.

3. Beams in aerospace structures: Beam models.

3. Stressed skin constructions: Aerospace beams, monocoque and semi-monocoque schemes. Ribs and frames. Simplified structural analysis of junctions; types of structural connections.

4. Plates: Kirchhoff and Mindlin plate theories and their extension to composite materials. Evaluation of stresses and strains for isotropic and composite elements. Sandwich structures.

5. Finite element method: Ritz's method and residual weighted methods: applications to one- and two-dimensional structures.

The Finite Element Method for the linear structural analysis: residual vector; stiffness matrix; loads and boundary conditions; properties and convergence of the solution.

6. Instability: Stability of elastic equilibrium, bifurcations, limit points. Buckling criteria. Approximate and exact solutions for the buckling of beams, plates and shells. Imperfection sensitivity.

Prerequisiti

Principles of structural analysis, strenght of materials, matrix algebra.

Modalità di valutazione

Examination consists of

A written test relevant to the exercises that have been presented and solved during the course (max grade: 30/30);

An oral examination relevant to all the contents of the course (+- 5 points wrt. the written test grade).

The oral examination could be taken only if the written test has been passed with a grade greater or equal than 18/30.

The student should be able to solve the exercises by properly setting up the problem, performing numerical calculations and illustrating the choices/assumptions taken throughout the solution of the exercises.

At the spoken exam the student should be able to:

illustrate and critically discuss the topics covered throughout the course;

discuss the solution of simple structural problems;

illustrate and discuss the theory and structure of the numerical tools developed and/or used during the course.

The final grade G is obtained as W-6<G<W+6 here W is the grade of the written test.

Bibliografia

C. T. Sun, Mechanics of Aircraft Structures, Editore: Wiley, Anno edizione: 2006, ISBN: 9780471699668
T.H.G. Megson, Aircraft Structures for Engineering Students, Editore: Elsevier, Anno edizione: 2012, ISBN: 0080969062
T. J. R. Hughes, The Finite Element Method: Linear Static and Dynamic Finite Element Analysis, Editore: Dover, Anno edizione: 2000, ISBN: 978-0486411811
T. Belytschko, W. K. Liu and B. Moran, Nonlinear Finite Elements for Continua and Structures, Editore: Wiley, Anno edizione: 2000, ISBN: 978-0-471-98774-1
O. A. Bauchau and J. I. Craig, Structural Analysis: With Applications to Aerospace Structures, Editore: Springer, Anno edizione: 2009, ISBN: 978-90-481-2516-6

Forme didattiche

Tipo Forma Didattica

Ore di attività svolte in aula

(hh:mm)

Ore di studio autonome

(hh:mm)

Lezione

60:00

90:00

Esercitazione

30:00

45:00

Laboratorio Informatico

10:00

15:00

Laboratorio Sperimentale

0:00

0:00

Laboratorio Di Progetto

0:00

0:00

Totale

100:00

150:00

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