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Questions and Answers
What is the function of a wing spar?
What is the function of a wing spar?
To provide structural support and resist bending in the wing.
Which members are considered internal stiffening members?
Which members are considered internal stiffening members?
- Wing/Tail ribs
- Fuselage frames
- Spars
- All of the above (correct)
Column buckling was first studied by Euler in 1744.
Column buckling was first studied by Euler in 1744.
True (A)
The critical buckling load $$ is given by the formula $ = \frac{\pi^2 EI}{l^2}$.
The critical buckling load $$ is given by the formula $ = \frac{\pi^2 EI}{l^2}$.
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What is the primary cause of out-of-plane deformation in a member under compressive loads?
What is the primary cause of out-of-plane deformation in a member under compressive loads?
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What happens when the compressive force causes a column to buckle?
What happens when the compressive force causes a column to buckle?
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Match the following concepts with their descriptions:
Match the following concepts with their descriptions:
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Study Notes
Wing Spar Function
- Provides structural support for the aircraft wing, transferring loads from the wing surface to the fuselage.
Internal Stiffening Members
- Spars: These are the primary load-carrying members in a wing, running along the length of the wing.
- Stringers: These are longitudinal members that run along the length of the wing skin, providing additional stiffness and helping to distribute load.
- Ribs: Transverse members that provide support for the wing skin and help to maintain its shape.
Column Buckling
- Euler's Formula: The critical buckling load, Pcr, is given by the formula: Pcr = π²EI/l², where:
- E: Modulus of elasticity of the material.
- I: Area moment of inertia of the cross-section.
- l: Length of the column.
- Primary Cause of Out-of-Plane Deformation: A compressive force applied to a slender column can cause it to buckle, which is a sudden out-of-plane deformation due to lateral instability.
- Effect of Buckling: When the compressive force exceeds the critical buckling load, the column loses its ability to resist further compression and undergoes a sudden collapse.
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