Some Anisotropic Properties on the Strength of the Plywood

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  • 合板の強度的異方性について
  • ゴウハン ノ キョウドテキ イホウセイ ニ ツイテ

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The calculation formulae ralating the stress in bending of the laminated wood-beam were checked by tests and verified their appricability to the plywood.<br>The anisotropic properties of strength of the plywood can be represented by the ratios of AE=E90/E0, BE=EB90/EB0 and NR=R90/R0 where E0, EB0 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, EB90 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.

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