Aerospace Structures
Lecture notes
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Chapter 0. Presentation of the subject
Introduction to the subject. (PDF)
Hypotheses, Previous knowledge, Objectives and skills, Description of contents, Bibliography.
Chapter 1. Structural description of the aircraft
Presentation Guide to Chapter 1. (PDF)
Topic 1.1. Loads on structural components. (PDF)
Structure definition, structural requirements, phases of structural design, types of structural analysis, Loads classification, load models.
Topic 1.2.Structural components of aircraft. (PDF)
Wing functions, wing elements, fuselage functions, fuselage types, fuselage elements, Cutout, Stabilizers structure.
Topic 1.3. Structures in the aeronautical sector. (PDF)
Truss structures, method of resolution, frame structures, method of resolution, lattice structures
Chapter 2. Bending, shear and torsion of thin-walled beams
Presentation Guide to Chapter 2. (PDF)
Topic 2.1.Bending and shear of open and closed, thin-walled beams (I). (PDF)
Kinematics, normal stresses, shear stress field on open sections, stress field on single-cell closed sections.
Topic 2.2. Bending and shear of open and closed, thin-walled beams (II). (PDF)
Concept of shear centre, alternate method to calculate shear stress, stress field on multiple cell sections, combined open and closed section.
Topic 2.3. Torsion on thin-walled beams. (PDF)
Stress field on open sections with one and several branches, stress field on single-cell closed sections, stress field on multiple cell sections.
Chapter 3. Thin plate theory
Presentation Guide to Chapter 3. (PDF)
Topic 3.1. Bending of thin plates. (PDF)
Definitions, Hypotheses, Equilibrium equations, Compatibility equations, Boundary conditions
Topic 3.2. Circular plates. (PDF)
Bending equations in polar coordinate system, internal forces in polar coordinate system, solution of the differential equation, boundary conditions.
Topic 3.3. Shells of revolution. (PDF)
General definition, differences between plates and shells, advantages of shell structures, Kirchhoff-Love hypothesis, membrane theory, basic geometrical relations, internal forces and equilibrium equations, strains and displacements.
Chapter 4. Composite and sandwich structures
Presentation Guide to Chapter 4. (PDF)
Topic 4.1. Laminate theory. (PDF)
Laminate definition, anisotropic behaviour, lamina stiffness matrix, hypotheses, laminate kinematics, internal forces, laminate stiffness matrix, laminate configurations, laminate equivalent constants.
Topic 4.2. Failure criteria. (PDF)
Failure mechanisms, global failure criteria, intralaminar failure criteria, delamination criteria.
Topic 4.3. Composite Beams. (PDF)
Analysis of beams, stresses in solid beams, displacements in solid beams, stresses in thin-walled beams, displacements in thin-walled beams.
Topic 4.4. Sandwich structures. (PDF)
Sandwich definition, sandwich advantages, hypotheses, stress field in sandwich beams, strains in sandwich beams, displacements.