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    Allen Screw Withdrawal Strength of Solid Wood and Laminated Veneer Lumber (LVL)
    (Kastamonu Univ, Orman Fak, 2009) Efe, Hasan; Kasal, Ali; Dizel, Taner; Arslan, Ali Riza; Erdem, Haldun Ender
    In this study, the allen screw holding performances in perpendicular to grain and parallel to grain of laminated veneer lumber (LVL) prepared of different wood species with polyvinylacetate (PVAc) and ure formaldehyde (UF) were investigated by comparing the identical solid wood materials. Specimens were prepared from beech (Fagus orientalis L.), scotch pine (Pinus sylvestris L.), and poplar (Populus nigra) woods which are commonly used in Turkish furniture industry. In the tests, allen screws which were in 5 mm diameter and 70 mm length were utilized. A total of 180 specimens that represented 3 material types, 3 wood species, 2 grain directions and 10 replications for each group were tested under static load for screw withdrawal tests. As a result of the tests, the highest allen screw holding strengths were obtained with solid beech in parallel to grain direction while the lowest results were obtained with solid poplar in perpendicular to grain. As a result of the study; it was concluded that the LVL which provides many technical and economical advantages over solid wood could be utilized as an alternative material in frame furniture, especcially constructed with allen screwed joints.
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    Comparison of mechanical properties of solid wood and laminated veneer lumber fabricated from Turkish beech, Scotch pine, and Lombardy poplar
    (Forest Products Soc, 2009) Erdil, Yusuf Ziya; Kasal, Ali; Zhang, Jilei; Efe, Hasan; Dizel, Taner
    Selected mechanical properties of laminated veneer lumber (LVL) prepared from Turkish beech (Fagus orientalis L.), Scotch pine (Pinus sylvestris L.), and Lombardy poplar (Populus nigra) veneers bonded with polyvinyl acetate and urea-formaldehyde adhesives and solid wood specimens of the same species were tested to evaluate the effects of species, adhesive type, and veneer grain orientation. The mechanical tests evaluated were compression and tensile strengths parallel to the grain, bending strength, modulus of elasticity, cleavage strength perpendicular to the grain, and block shear. Test results showed that the effects of wood species on all of the mechanical properties were statistically significant. Also, adhesive type was found to have a significant effect on the strength properties of the LVL specimens. But, considering the design flexibility with different forms and sizes and the opportunity to better utilize low-quality wood, LVL can be recommended as an alternative to solid wood. Results also showed that LVL could be utilized instead of solid wood material in different areas such as building and furniture constructions because most strength properties of LVL were at least as good as solid wood of the same species.