In the shear flow analysis of an aircraft fuselage section modeled with idealized booms and thin skins, which assumption is made regarding normal stress distribution?

(A) Direct (bending) stresses are carried entirely by the concentrated booms, while skins carry only shear flow

(B) Skins carry all normal bending stresses, while booms carry pure torsion

(C) Both booms and skins carry zero shear stress

(D) Poisson ratio is strictly zero in all structural members

Answer Key:

A

### Solution: The classical boom-skin idealization assumes that concentrated booms carry all direct axial and bending stresses, while the thin skin panels carry only shear flow. Correct: A.

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