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積層木質材(Glulam)의 中立軸이 强度的 性質에 미치는 영향
朴憲 건국대학교 1991 學術誌 Vol.35 No.2
In this study, thick 24mm glulam were composed of thick 3,4,6,8mm Larch laminas to study on the erect of location of neutral axis on mechanical properties of the glulam. The elasticity of lamina was estimated by stress wave timer and this estimated elasticity value was used to evaluate the elasticity of glulam. This evaluated elasticity valuers were compared with the elasticity values of glulam in bending. The result obtained can he summarized as follows: 1) The estimated elasticity of glulam by stress wave timer showed much lower value than the elasticity of glulam in bending. 2) The neutral axis exerted no influance on the elasticity of glulam, which moaned that maximum shear strength in the neutral axis showed no influance on elasticity limit. 3) The failure type of glulam was wholly simple tension failure and the horizontal shear failure near neutral axis was not taken place, which was that glue line was complete in bonding and the strength of the lamina was not various but uniform.
목재파아티클과 철선복합보오드의 물리적 및 기술적 성질에 관한 연구
박헌 한국목재공학회 1988 목재공학 Vol.16 No.3
In tendaney of manufacturing beam with laminating particleboard, it was thought that if the properties, especially mechanical properties, of particleboard be reinforced. the mechanical properties of particleboard-laminated beam would be also improved. So in this study the particleboard was reinforced with composing of wood particle and steel wire. This study was carried out to obtain the basic physical and mechanical properties of hoard composed of wood particle and steel wire, especially tensile strength and compressive strength which are the important factors of the laanina of beam, in order to estimate whether the board composed of wood particle and steel wire could be to improve the properties of the particleboard-laminated beam. The results obtained were summarized as follows: 1. The hoard composed of wood particle arid steel wire in accordance with lower board density took better thickness swelling. 2. The board with lower board density was unproved in higher value of tensile strength with more steel wires in prescribed cross section area of the board, for example, the board cf density 0.5 showing 140% improved value. 3. In compressive strength, the board with lower board density was also improved in higher value with more steel wires in prescribed cross section area.
朴憲 건국대학교 부설 중원인문연구소 1987 論文集 Vol.6 No.-
본 硏究에서는 落葉松을 製造한 후 熱水軟化處理 및 非處理한 6㎜ 두께의 落葉松單板을 메란티베니아積層板材와 混合하여 構成方法 16가지로 單板積層材를 製造하고 그에 대한 휨 强度的 性質을 조사하여 그 破壞係數, 彈性係數, 比例限界가지의 일量 및 最高荷重까지의 일 量을 구하여 相互比較하였으며, 그 결과는 다음과 같다. 즉, 落葉松單板과 메란티베니아 積層板材로 混合構成한 單板積層材가 落葉松單板만으로 構成한 單板積層材에 비해 破壞係數의 경우 최고 160%, 彈性係數는 최고 200%의 향상된 값을 보였으며, 도한 比例限界까지의 일 量은 최고 200% 정도의 향상된 값을 나타내었다. 특히 메란티베니아 積層板材가 下部에 構成된 積層材가 인장라미네이션 효과를 보여 우수한 휨 强度的 性質을 나타냈으나 中央에 構成한 경우에는 中央部位에서 발생하는 最大剪斷應力에 脆弱한 면을 보여 强度的 性質이 떨어지는 것을 알 수 있었다. 도한 熱水軟化處理 單板積層材는 非處理單板積層材에 비해 强度積 性質이 낮게 나타났는데, 이는 熱水處理에 의한 강도적 성질의 低下로 판단된다. Half of the 6㎜ thick veneers of Larch(Larix leptolepis Gordon) in this study were treated with hot water of 60℃ for 20 minutes and the other half were not treated. All of these treated and non-treated veneers were made use of into laminated veneer lumbers(LVLs) complexed with meranti veneer-laminated woods in 16manners. The manufactured laminated veneer lumbers(LVLs) were tested in bending, which included modulus of rupture(MOR), modulus of elasticity(MOE), work to proportional limit, and work to maximum load. The results were as follows; 1. The laminated veneer lumbers(LVLs) composed of the veneers of Larch and meranti-veneer-laminated woods were higher by maximum 160% in modulus of rupture than the LVL of only veneers of Larch, higher by maximum 200% in modulus of elasticity, and higher by maximum 200% in work to proportional limit. 2. The LVLs formed with meranti veneer-laminated wood in lower layer showed the tension lamination effect, and so better bending strength. 3. But the LVLs formed with meranti veneer-laminated wood in middle layer showed lower bending strength because the meranti veneer-laminated woods are weak in maximum shear stress in the mid depth of the LVL. 4. The LVLs composed of hot(60℃) water-treated veneers of Larch showed lower strength in bending than those compose of non-treated veneers.