10-07-2012, 12:29 PM
AE2302 AIRCRAFT STRUCTURES-II
[attachment=27339]
Function of Aircraft Structures
Resists applied loads (Aerodynamic loads acting on the wing structure)
Provides the aerodynamic shape
Protects the contents from the environment
Definitions
Primary structure:
A critical load-bearing structure on an aircraft. If this structure is severely damaged, the aircraft cannot fly.
Secondary structure:
Structural elements mainly to provide enhanced
aerodynamics. Fairings, for instance, are found
where the wing meets the body or at various
locations on the leading or trailing edge of the
wing.
Semi-monocoque Structures:
Constructions with stiffening members that may also be required to diffuse concentrated loads into the cover.
More efficient type of construction that permits much thinner covering shell.
Simplifications
The behavior of these structural elements is often idealized to simplify the analysis of the assembled component
Several longitudinal may be lumped into a single effective
longitudinal to shorten computations.
The webs (skin and spar webs) carry only shearing stresses.
The longitudinal elements carry only axial stress.
The transverse frames and ribs are rigid within their own planes, so that the cross section is maintained unchanged during loading.
[attachment=27339]
Function of Aircraft Structures
Resists applied loads (Aerodynamic loads acting on the wing structure)
Provides the aerodynamic shape
Protects the contents from the environment
Definitions
Primary structure:
A critical load-bearing structure on an aircraft. If this structure is severely damaged, the aircraft cannot fly.
Secondary structure:
Structural elements mainly to provide enhanced
aerodynamics. Fairings, for instance, are found
where the wing meets the body or at various
locations on the leading or trailing edge of the
wing.
Semi-monocoque Structures:
Constructions with stiffening members that may also be required to diffuse concentrated loads into the cover.
More efficient type of construction that permits much thinner covering shell.
Simplifications
The behavior of these structural elements is often idealized to simplify the analysis of the assembled component
Several longitudinal may be lumped into a single effective
longitudinal to shorten computations.
The webs (skin and spar webs) carry only shearing stresses.
The longitudinal elements carry only axial stress.
The transverse frames and ribs are rigid within their own planes, so that the cross section is maintained unchanged during loading.