Aircraft Structure

• Introduction Different structural components of aircraft and their configuration, Types of loads acting on aircraft structure, V-n diagram and Gust envelope, Properties and selection of aircraft materials, Honeycomb structures, Use of thin-walled cross-sections in aircraft structural components.
• Composite Materials Composition and Types of composite materials, Effective modulus of composite laminates, Applications of composites.

Theory of Elasticity Stresses on inclined plane subjected to tri-axial loading, 3-D principal stresses and strains, Stress-displacement relations, Strain compatibility, Equilibrium equations, Generalized Hooke’s law, Types of materials based on elastic symmetry: anisotropic, orthotropic and isotropic materials. Plane stress and plane strain conditions, governing equations for plane elasticity, Compatibility relation in terms of stress components, Airy’s stress function, Solution of plane elasticity problems using Airy’s stress function.

• Torsion St.Venant’s torsion theory, Warping in shafts of circular and non-circular cross-sections, Difference between polar moment of inertia and torsional rigidity, Prandtl’s stress function, Torsion of open and closed thin-walled sections, Torsion of multi-cell closed sections, Torsional shear flow.
• Unsymmetrical Bending Euler-Bernoulli beam equation for unidirectional and bidirectional bending, Timoshenko beam equation, Deflection of cantilever beam using Euler-Bernoulli and Timoshenko beam theory, Bending of unsymmetrical cross-sections, Structural idealization.

• Flexural Shear Stress Transverse shear stress in solid cross-sections, Transverse shear stress and shear flow in general symmetric and unsymmetrical thin-walled sections, Location of shear center in open and closed cross-sections, Shear flow in multi-cell thin-walled sections, Combined torsional and flexural shear flow.
• Buckling of Columns and Plates Derivation of governing equation for column buckling, Euler’s and Rankine’s buckling load, Effect of end conditions on column buckling, buckling of thin plates.

• Vibration Basic concepts of vibration, Types of vibration, General governing equation for vibration, Un-damped and Damped free vibration, Forced vibration, Logarithmic decrement, Torsional vibrations, Vibration of Two Degree of Freedom System, Coordinate coupling, Semi-definite systems
• Vibration of Continuous Systems Torsional vibration of shaft, longitudinal vibration of bars and lateral vibration of beams.