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    BENDING CHARACTERISTICS OF LAMINATED WOOD COMPOSITES CONSTRUCTED WITH BLACK PINE WOOD AND ARAMID FIBER REINFORCED FABRIC
    (Slovak Forest Products Research Inst, 2021) Karaman, Abdurrahman; Yildirim, Mehmet Nuri; Tor, Onder
    The aim of this study was to determine the 4-point bending strength and modulus of elasticity in bending of Black pine wood laminated materials reinforced with aramid fiber was bonded using epoxy or polyurethane glues separately. The samples were prepared in accordance with the TS 5497 EN 408 (2006). The results of the study determined that the highest value for static bending strength was found in the laminated wood samples (83.94 N.mm(-2)) that were prepared using inter-layer aramid fiber reinforced polymer (AFRP) and epoxy glue. The highest value of modulus of elasticity in bending was found in the samples prepared with inter-layer epoxy and AFRP (10311.62 N.mm(-2)). It was observed that the samples parallel to the glue line of the laminated material showed higher performance compared to those perpendicular to the glue line. The data obtained as a result of this study demonstrated that aramid fiber reinforced Black pine wood laminated materials can be used in the building industry as building materials.
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    The Bending Moment Resistance of Corner Joints Reinforced with Glass Fiber Polymer
    (Kastamonu Univ, Orman Fak, 2018) Yildirim, Mehmet Nuri; Tor, Onder; Karaman, Abdurrahman
    Aim of study: This study aimed to determine the effects of glass fiber reinforced polymer (GFRP) and adhesive type on the diagonal compression and tensile strength in L-type corner joints connected by a wood biscuit. Material and Methods: Medium density fiberboard coated with melamine plate (MDF-Lam), wood biscuit with a size number of 20 as the joining member, GFRP for strengthening purposes, and epoxy adhesive, polyvinyl acetate (PVAc-D4), polyurethane (PU-D4) as adhesives were used. The diagonal compression and tension tests were carried out under static load according to ASTM-D1037 standards. Main results: Results indicated that using GFRP significantly increased the diagonal compression and tensile strength of L-type corner joints connected by a wood biscuit. Highlights: It is recommended to use the combination of GFRP and epoxy adhesive to have better compression and tensile strength in the corner joints made of MDF-Lam.
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    The effects of different variables on the direct screw withdrawal strength in plywood
    (Kastamonu Univ, 2017) Yorur, Huseyin; Tor, Onder; Gunay, Muhammed Nuri; Birinci, Emre
    Aim of study: The purpose of this study was to investigate the effect of the pilot-hole, screw type, screwing direction, water soak and adhesive on the screw withdrawal strength in plywood. Material and Methods: Testing blocks were cut from 18-mm-thick beech plywood and were sized to 50 mm x 50 mm according to TS EN 13446 standards. Polyvinyl acetate (PVAc) and polyurethane (PU) as adhesives were injected into predrilled holes (80% of the screw major diameter). Two types of screws (3.5 mm and 4 mm in diameter) were inserted in perpendicular (face) and parallel (edge) to the surface of blocks. Half of the blocks were immersed in water for 2 hours before the screw withdrawal test. The results were analyzed and interpreted by statistical analysis. Main results: The results indicated that the screw withdrawal strength perpendicular to the surface is higher than that the one parallel to the surface. The testing blocks with PU specimens in pilot-hole showed higher screw withdrawal strength than the blocks with PVAc. The screw withdrawal strength was lower when blocks were immersed in water. It was also found that the screw withdrawal strength increases, as the screw major diameter increases. Research highlights: It was concluded that applying PU in pilot-holes before driving screw into plywood significantly affected screw withdrawal performance.
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    EFFECTS OF FACTORS ON DIRECT SCREW WITHDRAWAL RESISTANCE IN MEDIUM DENSITY FIBERBOARD AND PARTICLE-BOARD
    (Univ Bio-Bio, 2020) Yorur, Huseyin; Birinci, Emre; Gunay, M. Nuri; Tor, Onder
    An increase in demand on solid wood that is insufficient supply to meet in the world necessarily directed to other engineering materials that could be an alternative to the solid wood. In this context, instead of using solid wood in furniture and construction industry, wood-based panels such as medium density fiberboard (MDF) and particleboard (PB) have become widely used as construction material. Limited research has been done in the field of fastener performance as mechanical properties with different parameters in the joints constructed with these panels. Therefore, in this study. the parameters of screw type, pilot hole, screw orientation, water treatment and adhesives were investigated in MDF and PB. The results indicated that the highest direct screw withdrawal (DSW) resistance was observed in the test blocks applied with PU and the lowest DSW resistance was in the test blocks without a pilot hole drilled in both materials. In addition, MDF in general had better DSW resistance than PB in almost all combinations of the parameters. The treatment of water into MDF and PB test blocks negatively affects the DSW resistance. The DSW resistance in the face orientation was found to be higher than the corresponding ones in the side orientation in both materials.