Discussion
Match each effect in List I with the assumption of simple bending theory it violates in List II.
List I
A. Shear lag in a wide flange
B. Non-zero product of inertia
C. A buckled compression panel
D. Two bonded materials
List II
1. Bending occurs about a principal axis
2. Plane sections remain plane
3. A single homogeneous material throughout
4. The whole section remains fully effective
Select the correct match.
Answer: A
Each of the four complications that airframe work runs into corresponds to one of the assumptions behind the elementary formula. Recognising which assumption has broken tells you immediately which correction to reach for.
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