A Composite Beam Is Made Up of a 200 Mm $\left(E_{c}=14 \mathrm{GPa}\right)$

question 16

Short Answer

A composite beam is made up of a 200 mm ⫻ 300 mm core $\left(E_{c}=14 \mathrm{GPa}\right)$ and an exterior cover sheet (300 mm ⫻ 12 mm, $\left.E_{c}=100 \mathrm{GPa}\right)$ on each side. Allowable stresses in core and exterior sheets are 9.5 MPa and 140 MPa, respectively. The ratio of the maximum
Permissible bending moment about the z axis to that about the y axis is
Most nearly: (A) $0.5$
(B) $0.7$
(C) $1.2$
(D) $1.5$

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