Aerospace Structures

Sections :

• Loads on Aircraft
  • The different types of loads exerted on an aircraft are briefly explained. These loads include both aerodynamic and manoeuvre loads.
• Function of Structural Components
  • An aircraft is made from many different components. Each component has a specific function but form an integral whole.
• Bending Of Beams With Non-Symmetrical Cross Section
  • Establishment of sign convention for an arbitrary beam section. The Effective Bending Moment and the Effective Shear Forces are defined and derived. An example is given.
• Stress, Strain and Displacement Relationship for Open and Closed Single CellThin-Walled Beams
  • Concept of Shear Flow is introduced. The Shear Centre of an open beam section, twist and
    warping of a closed beam section are explained through an example.
• Torsion of Thin Walled Beam Sections
  • The application of a torque on a closed or open section beam produces warping. This section attempts to illustrate the characteristics of such a distribution by using an open beam section.
• Structural Idealization
  • Idealization of a wing section is performed to calculate the stresses on the stringers and shear on the skin.This can be done using nodes to represent the stringers. Spread sheet examples are given.
• Multicell Beams
  • The wing section can be divided into multiple cells with applied torques. Method of determining Rate of Twist and Shear Flow distribution is shown in an example.
• Tapered Beams
  • A real wing on an aircraft is often swept and tapered. This section shows the method of determining the shear flow on an idealized tapered wing.
• Shear Panels, Ribs & Cut-outs
  • The technique for analysing shear panels and ribs is presented. Also looking at the effect of large cut-outs regions in the skin panels on the overall stress field of the aircraft components
• Structural Constraints
  • Supports prevent a structure from deforming or warping about any axis, thus generating extra loads. Because of the thin nature of aircraft structural components, when bending occurs, the shear strains in the skin are large enough to modify the loads carried by booms
• Aeroelasticity
  • The dynamic effects of the interaction of wing loads and wing elasticity can lead to large deformations. This section shows a simple method of determining the interactions assuming the wing has a very long span with constant cross-section.