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    Determination of modulus of rupture and modulus of elasticity on flakeboard with fuzzy logic classifier
    (Elsevier Sci Ltd, 2009) Yapici, Fatih; Ozcifci, Ayhan; Akbulut, Turgay; Bayir, Raif
    In this study, a model based on fuzzy logic classifier was created in order to determine the values of modulus of elasticity (MOE) and modulus of rupture (MOR) of flakeboards. MOR and MOE are the most important mechanical features of wood-composite panels. The most appropriate mixture ratios to be used in production of wood based boards were determined experimentally. These experiments are very expensive for the manufacturers and require time. For this purpose, MOE and MOR values were measured depending on flakes mixture ratios of manufactured boards. Using these values, input and output values and rule base of fuzzy logic classifier were created. With the fuzzy logic classifier model prepared in Matlab Simulink, MOR and MOE values for flakes mixture ratios were predicted. It was observed that the fuzzy logic classifier predicted MOR and MOE values with 95-97% accuracy. With this system, for the manufacture of wood-composite materials, the most appropriate chip mixture amount required by the manufacturer could be determined. (C) 2008 Elsevier Ltd. All rights reserved.
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    Laminated veneer lumber from Rowan (Sorbus aucuparia Lipsky)
    (Academic Journals, 2009) Kol, Hamiyet Sahin; Keskin, Hakan; Korkut, Sueleyman; Akbulut, Turgay
    This study was designed to determine some physical and mechanical properties and surface roughness of laminated veneer lumber (LVL) made from Sorbus aucuparia Lipsky wood which has no detailed research in the literature. The sample trees were taken from the Kure district in Kastamonu, Turkey. The 12 ply LVLs manufactured from 1.6 mm thick rotary peeled veneers and bonded with urea formaldehyde adhesive. Conventional methods followed and the test procedures were performed on small clean specimens. Also, this study involves the comparison of the mechanical properties of LVL made from S. aucuparia Lipsky wood to those of conventional LVLs. It was found that air-dry density, thickness swelling, thermal conductivity, MOR and MOE, compression strength, surface hardness, shear strength and surface roughness (Ra) were 0.737 g/cm(3), 3.63%, 0.2259 W/m-K, 80.6 N/mm(2), 6985.6 N/mm(2), 58.36 N/mm(2), 29.15 N/mm(2), 5.28 N/mm(2) and 5.13 mu m respectively. When S. aucuparia L. wood is used to produce LVL for use in the furniture industry, the resulting physical and mechanical property values are sufficient to produce an acceptable product. Also, it appears to be a suitable alternative to currently used alnus spp. and fagus spp. according to usage area.