I would like to determine the maximum load $($kg$)$ that can be supported by a plywood countertop $1\mathrm{.}21$m long and $0\mathrm{.}4$m wide, with a thickness of $18$mm$.$ I have tried using Roark's formulas for stress and strain in plates $-$ Chapter $11($Table $11\mathrm{.}4)$but the answer came wrong as those formulas are for isotropic materials, not anisotropic like plywood. I would like to know the equivalent equation$/$s for anisotropic materials and to also have the max load that can be supported by my plywood please. The plywood is fixed to a frame on its short edges and is free on the long edges. I have managed to find all mechanical values such as the bending strength, modulus of elasticity in different directions etc, as attached so it is just the equation i need! PLEASE HELP!!! :) Also please give me the references for equations that you use.