積層材の含水率変化によって生じる内部応力の解析

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  • 積層材の含水率変化によって生じる内部応力の解析(林学部門)
  • セキソウザイ ノ ガンスイリツ ヘンカ ニ ヨッテ ショウジル ナイブ オウリ
  • Analysis of internal stress in laminated wood resulting from moisture content change (Forestry)

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Internal stress in two-ply laminated wood resulting from difference of swelling coefficient between two laminae after moisture content change was calculated in plate stress condition by the finite element method. Following conditions were assumed : Cross sections of two laminae used for each laminated wood were tangential and radial of Quercus crispula B1. respectively, and both were rectangular or triangular. Internal stress in laminated wood after 5% increase of moisture content was calculated elastically. The results were as follows : In the case of the laminated wood composed of the rectangular laminae, the maximum compressive stress of about 45kg/(cm)^2 parallel to glue line in the tangential lamina and the maximum tensile stress of about 50kg/(cm)^2 in the same direction in the radial lamina were produced along glue line. And, the maximum tensile stress of about 50kg/(cm)^2 perpendicular to glue line in the tangential lamina and the maximum shear stress of about 20kg/(cm)^2 in both laminae were produced near corners of laminae along glue line. In the case of the laminated wood composed of the triangular laminae, both the maximum tensile stress perpendicular to glue line and the maximum shear stress were about 10kg/(cm)^2.

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