The calculation formulae ralating the stress in bending of the laminated wood-beam were checked by tests and verified their appricability to the plywood.
The anisotropic properties of strength of the plywood can be represented by the ratios of A_E=E₉₀/E₀, B_E=E_B90/E_B0 and N_R=R₉₀/R₀ where E₀, E_B0 and R₀ denote respectively the elastic moduli in edgewise tension or compression, the elastic moduli in bending and modulus of rupture in bending of plywood parallel to the face grain, and E₉₀, E_B90 and R₉₀ denote those values of plywood perpendicular to the face grain. These values in the cases of 3-ply, 5-ply and 7-ply plywood of LAUAN which are constructed from single species and have symmetetrical construction to their core are evaluated by the computed results using the basic strength of veneer, and the anisotropic properties of them are discussed.

View full abstract