Scheda programma d'esame
AEROSPACE STRUCTURES
(AEROSPACE STRUCTURES)
LUISA BONI
Anno accademico2018/19
CdSINGEGNERIA AEROSPAZIALE
Codice501II
CFU12
PeriodoAnnuale
LinguaInglese

ModuliSettoreTipoOreDocente/i
AEROSPACE STRUCTURES IING-IND/04LEZIONI60
LUISA BONI unimap
AEROSPACE STRUCTURES IIING-IND/04LEZIONI60
LUISA BONI unimap
Programma non disponibile nella lingua selezionata
Learning outcomes
Knowledge

The student who successfully completes the course will have the ability to compute the distribution of stress for typical aerospace structures (wing-boxes, fuselages) adopting the elementary theory approach and the forces method; will be able to demonstrate a solid knowledge of the buckling behavior of compressed structures; will be aware of the energetic approaches to the study of structural problems; will be aware of the approach to structural problems based on the use of the finite element method.

 

Assessment criteria of knowledge

The evaluation is based primarily on the verification of the basic knowledge necessary for the study of aerospace structures (equilibrium, shear flow and normal stress computation in thin walled structures). The uncertainty of these skills is not allowed. Also the knowledge of buckling phenomena and the knwoledge of methods for the solution of buckling problems represent an important part of the preparation and evaluation of the student. The uncertainty of these skills is not allowed. The examination is based on the solution of exercises and on a subsequent discussion of the results and, if it is necessary, on the discussion of some theoretical aspects.

Methods:

  • Final oral exam.
Skills

Course Contents

 

( PART I ) - Basic Structural Analysis - Statics (October-December)

 

Introduction to structural mechanics.

Beams in bending, shear and torsion.

Principles of aerospace structures construction

Bending, shear and torsion of thin-walled tubes

Stresses in multi-cell tubes

Discrete models of aerospace structures (wing-box, fuselage): elementary theory

Correction of the elementary theory results

Second order approach: shear diffusion and axial constraint effects in the aerospace structures

Matrix method of structural analysis (Force Method and Displacements Method)

 

( PART II ) - Analysis of Aerospace Structures - Statics (February-April)

 

Introduction to the use of PATRAN-NASTRAN codes (computer lab)

Energy methods of structural analysis

Theory of thin plates

Theory of structural instability (buckling of beams, plates and stiffened panels)

Crippling of compressed structures (crippling of beams, plates and stiffened panels)

 

( PART III ) - Introduction to Structural Dynamics (May)

 

Introduction to the use of PATRAN-NASTRAN codes (computer lab)

Notes and exercises on the single-degree-of-freedom system

Analysis of multi-degrees-of-freedom systems

Notes to the dynamics of continuous systems (bending and torsional vibrations of beams)

Modal analysis of structural systems

Notes and exercises on the energy methods for the dynamic analysis of structures

Assessment criteria of skills

Only Erasmus students can subdived the examination phase into two distict parts.  The examination for all the other students consists in a full exam.

For Erasmus students:

Exams for the PART I (January-February)

Exams for the PART II or Full exams (June-July)

Prerequisites

Students should have the ability to use and/or perform the following:

  • Vector and tensor notation
  • Concepts of stress and strain
  • Basics of the elasticity theory
  • Isotropic constitutive relations
  • Classic Beam Theory
Teaching methods

Theoretical lessons and, in the second period, use of personal computer for the preparation of Finite Element models by Nastran-Patran codes. 

Delivery: face to face

Attendance: Advised

Learning activities:

  • attending lectures
  • participation in seminar
  • individual study
  • Laboratory work

 

Teaching methods:

  • Lectures
  • Task-based learning/problem-based learning/inquiry-based learning
  • laboratory

 

Syllabus

The theory of elasticity: two-dimensional problems (stress function method). Elementary theory of thin walled beams (shear, bending and torsion). Study of lumped parameters structures (models of wing-boxes and fuselages). Shear diffusion and warping of thin walled beams. Lumped parameters structures as undetermined systems. Matrix methods: the forces method and the displacement method. Finite Element Analysis. Statics of plates and membranes. Global buckling of compressed beams: bending, torsion, bending and torsion. Buckling of compressed plate. Local buckling of compressed beams. Buckling of compressed stiffened panels. Crippling of both compressed beams and compressed stiffened panels. Dynamic analysis: modal analysis of discrete and continuous systems (cables and beams).

Bibliography

Spacecraft Structures and Mechanisms  T.P. Sarafin, 1995

 

Aircraft Structures for Engineering Students T.H.G. Megson, 1972

 

Theory and Analysis of Flight Structures R.M. Rivello, 1969

 

Theory of Elasticity S.P. Timoshenko, J.N. Goodier, 1970

 

Mechanics of Materials  S.P. Timoshenko, J.M. Gere, 1972

 

Introduction to Structural Dynamics and Aeroelasticity D.H. Hodges, 2002

 

Lectures and Exercises of Aerospace Structure  L. Boni (e-learning)

Recommended reading includes the following works: T.H.G. Megson "Aircraft Structures for Engineering Students" R.M. Rivello "Theory and analysis of flight structures" E. F. Bruhn "Analysis and design of flight vehicle structures" S. P. Timoshenko, J. N. Goodier "Theory of Elasticity" O. A. Bauchau, J. I. Craig "Structural Analysis: with application to aerospace structures"

Work placement

A good skill in the solution of structural problems, using a critical approach and efficient methods for the discretization of problems, allows the student to approach engineering problems not only in the field of aerospace structures.

Ultimo aggiornamento 14/10/2018 11:30