Discussion
Match each section type in List I with its shear or torsion characteristic in List II.
List I
A. Open channel
B. Single-cell closed box
C. Thin angle
D. Multi-cell box
List II
1. Constant shear flow given by torque over twice the area
2. Shear centre outside the section
3. Cells coupled by a common rate of twist
4. Shear centre at the intersection of the leg centrelines
Select the correct match.
Answer: B
The four cases cover most of what airframe work meets. Note how differently the shear centre behaves: outside the material for a channel, at the leg junction for an angle, and at the centroid for a doubly symmetric box.
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