ALTERNATE PLIES AND ADHESIVE BONDS IN THE SPLITTING RESISTANCE OF PLYWOOD

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  • KUWAMURA Hitoshi
    Prof., Dept. of Architecture, School of Engineering, The University of Tokyo, Ph. D.

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  • 合板の割裂強さを担う二軸配向と接着層の役割
  • ゴウハン ノ カツレツ ツヨサ オ ニナウ 2ジクハイコウ ト セッチャクソウ ノ ヤクワリ テッコツ モクシツ コウゾウ ノ ケンキュウ ソノ 8
  • — Study on steel-framed timber structures Part 8 —
  • － 鉄骨木質構造の研究 その８ －

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Abstract

Strengths of plywood subjected to in-plane tension, bending, and interior pressure in a hole were experimentally investigated. The tested plywood is composed of nine plies of lauan veneer, and the plies are bonded together with melamine-urea-formaldehyde cocondensate adhesives. These tests, when the axis of tensile or bending specimen is inclined to the face grain, reveal the reason why plywood is so resistant against splitting failure is owing to the alternate perpendicular plies of veneer as well as the sufficient shear strength of adhesive bond. In such a case, the crack of veneer is interrupted by neighborhood veneer, and then the fracture path is associated with shear failure of the bond. In other words, either tensile or bending strength of such an inclined plywood member is substantially elevated by the shear strength of the bond. For the same reason, the holed plate under interior pressure does not split but experiences compressive yielding only if the edge distance is greater than double the diameter of the hole.

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