Assume a 0.05 in thick [15/ - 154]s simply supported angle-ply laminated plate made from a material.

Assume a 0.05 in thick [15/ − 154]s simply supported
angle-ply laminated plate made from a material with a ply thickness of tply =
0.005 in and a density of ρ = 0.05 lb/in3. For this material, we know

Determine the frequency of free vibration ω11 and plot
it along with the ω11 for a steel plate (E = 30 × 106 psi, ν = 0.33
ρ = 0.28 lb/in3 ), assuming the planform dimensions of the plate are
within the range 0.5 ≤ a/b ≤ 5, where b = 12.