Figure shows the cross section of a single cell, thin walled(adsbygoogle = window.adsbygoogle || []).push({});

beam with the horizontal axis of symmetry. The direct stresses are carried

by the booms B1 to B4, while the walls are effective only in carrying shear

stresses. Assuming that the basic theory of bending is applicable, calculate

the position of the shear center S. The shear modulus G is the same for all walls.

Cell Area = 135000 mm^2

Boom Areas B1 = B4 = 450 mm^2, B2 = B3 = 550 mm^2

Wall Length(mm) Thickness(mm)

12,34 500 0.8

23 580 1.0

41 200 1.2

Ans: 197.2 mm from vertical through booms 2 and 3.

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# Aircraft structure (thin walled closed section beam)

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