Question: (a) Evaluate the shape facture e B for stiffness-limited design in bending of a square box section of outer edge-length h=20 mm and wall thickness

(a) Evaluate the shape facture e B for stiffness-limited design in bending of a square box section of outer edge-length h=20 mm and wall thickness t=1 mm. Is this shape more efficient than one made of the same material in the form of a tube of diameter 2r=20 mm and wall thickness t = 1.28 mm (giving it the same mass per unit length, m/L)? Treat both as thin-walled shapes. (b) Make the same comparison for the shape factor f B for strength-limited design

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