Yazar "Yapici, Fatih" seçeneğine göre listele
Listeleniyor 1 - 17 / 17
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe COMPARISION OF THE MULTIPLE REGRESSION, ANN, AND ANFIS MODELS FOR PREDICTION OF MOE VALUE OF OSB PANELS(Slovak Forest Products Research Inst, 2016) Yapici, Fatih; Senyer, Nurettin; Esen, RasitThis research investigates the prediction of modulus of elasticity (MOE) properties, which is the most important properties in many applications, of the oriented strand board (OSB) produced under different conditions (pressing time, pressing pressure, pressing temperature and adhesive ratios) by multiple regression, artificial neural network (ANN) and adaptive Neurofuzzy inference system (ANFIS). Software computing techniques are now being used instead of statistical methods. It was found that the constructed ANFIS exhibited a higher performance than multiple regression and ANN for predicting MOE.Software computing techniques are very useful for precision industrial applications and, also determining which method gives the highest accurate result.Öğe 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, RaifIn 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.Öğe Determination of Static Fatigue Performance of Upholstery Foams(Kastamonu Univ, Orman Fak, 2012) Gok, Ayse; Yapici, Fatih; Gulsoy, Sezgin Koray; Kurt, Seref; Altun, Suat; Kilinc, Izham; Korkmaz, MustafaIn this study, change of hardness value of polyurethane foam used in furniture upholster was investigated. The dimension of test samples was determined that based on the surface of one seat 45x45x10 cm. The change of hardness value of test samples was determined after testing of fatigue performance applied to7000 times at 50, 70, 90 and 120 kg. Density value of test samples was determined. Result shown that the high density foam was affected less then low density foam during the fatique performance.Öğe Dimensional Stability of Uludag Fir Wood Treated with Liquid Nitrogen after the Steam Test(Kastamonu Univ, Orman Fak, 2012) Kurt, Seref; Ozcan, Suleyman; Yapici, Fatih; Likos, ErkanIn this study, the effect of liquid nitrogen on dimensional stability of Uludag fir (Abies bornmulleriana Mattf) wood after exposing to the steam test was determined. Test samples were treated with liquid nitrogen (LN) for 1, 4 and 10 hours. Subsequently both samples treated with liquid nitrogen and control samples were conditioned to 12 % MC. Dimensional stability of Uludag fir wood was measured after exposing to steam for 2, 6, 12, 24, 48, and 96 hours according to the procedure of TS EN 317. Consequently, different values of dimensional stability of specimens treated with liquid nitrogen were observed.Öğe THE EFFECT OF EDGE BANDING THICKNESS OF SOME TREES ON WITHDRAWAL STRENGTH OF BEECH DOWEL PINS IN COMPOSITE MATERIAL(Slovak Forest Products Research Inst, 2011) Yapici, Fatih; Likos, Erkan; Esen, RasitComposite materials and wooden dowels are being used increasingly in the construction of furniture frames and inner decoration. Yet there is little information available concerning the withdrawal strength of various fasteners, and, in particular, dowels in composite materials edged solid wood edge bandings. The aim of this study was to determine the withdrawal strengths of 6, 8, 10 mm diameter dowels produced from beech with respect to edge of a medium-density fiberboard (MDF) or particleboard (PB) edged with 5, 10 and 15 mm thickness of solid wood edge banding of scotch pine, oriental beech and lime tree, bonded with hot-melt, poly (vinyl acetate) (PVAc) and Desmodur-VTKA (D-VTKA), a polyurethane based one-component adhesive. The effects of edge banding thickness, dimension of dowels, type of composite materials and type of adhesives used for edge banding on the withdrawal strength were determined. The highest (6.68 N.mm(-2)) withdrawal strength was obtained in beech dowels with 8 mm diameter for MDF with 5 mm thickness of solid wood edge banding of bonded beech with D-VTKA adhesive.Öğe THE EFFECT OF GRAIN ANGLE AND SPECIES ON THERMAL CONDUCTIVITY OF SOME SELECTED WOOD SPECIES(North Carolina State Univ Dept Wood & Paper Sci, 2011) Yapici, Fatih; Ozcifci, Ayhan; Esen, Rasit; Kurt, SerefIn this study the thermal conductivity of different wood materials was determined. For this purpose, Scots pine (Pinus sylvestris L.), Uludag fir (Abies Bornmulleriana Matff), Oriental beech (Fagus orientalis L), Oak (Quercus robur L.), and Chestnut of Anatolia (Castanea sativa Mill.) woods were used. In the test, the thermal conductivity of the woods was measured according to procedure of ASTM C 1113-99 standards. The lowest thermal conductivity was obtained in the perpendicular direction of Scots pine samples as 0.156 Kcal/mh degrees C. The highest thermal conductivity was obtained from perpendicular direction of samples in Oriental beech as 0.331 Kcal/mh degrees C.Öğe THE EFFECTS OF ADHESIVE RATIO AND PRESSURE TIME ON SOME PROPERTIES OF ORIENTED STRAND BOARD(North Carolina State Univ Dept Wood & Paper Sci, 2011) Gunduz, Gokhan; Yapici, Fatih; Ozcifci, Ayhan; Kalaycioglu, HulyaThis study was carried out to determine the effects of adhesive ratio and pressure time on thickness swelling (TS), internal bond (IB), modulus of rupture (MOR), and modulus of elasticity (MOE) properties of oriented strand board (OSB). For this purpose, 80 mm long strands made of Scots pine (Pinus sylvestris L.) were bonded with phenol-formaldehyde resin at three different ratios (3, 4.5, and 6%) to produce three-layer cross-aligned OSBs. Strands used for the production of OSB panels were made up 40% of core layer and 60% of outer layers. The panels were pressed for three different press times, from 3, 5, to 7 minutes, under 0.4 MPa pressure, aiming for a target density of 0.70 g/cm3. TS, IB, MOR, and MOE properties of OSB panels were evaluated according to the standards (TSE EN 117-319-310). Results showed that MOR and MOE values were changed in the ranges 25.31 to 42.27 N/mm(2), and 2848.90 to 6545.63 N/mm(2), respectively. Also, the results showed that as adhesive ratio and pressure time increased, the TS, MOR, and MOE values increased too.Öğe The Effects of Fire Retardants Paint on Combustion Properties of Fir Wood(Kastamonu Univ, Orman Fak, 2012) Ozcan, Cemal; Esen, Rasit; Likos, Erkan; Kurt, Seref; Yapici, FatihThe effects of fire retardants paint on combustion properties of fir (Abies bornmulleriana M.) were examined. For this purpose, fire retardants paint were applied on the surface of test sample according to company's suggestions. The combustion test was performed according to the ASTM-E 69 standard. The mass reduction, release of gasses (CO, NO, O-2), and temperature differences of samples were determined for each 30 seconds during combustion. It was observed that the highest mass reduction occurred in fir wood with fire retardant paint.Öğe Effects of machining method and grain orientation on the bonding strength of some wood species(Elsevier Science Sa, 2008) Ozcifci, Ayhan; Yapici, FatihThis study was conducted to determine the effects of various machining methods and grain orientation on bonding strength of some wood species. For this purpose, Oriental beech (Fagus orientalis Lipsky.), Oak (Quercus robur), Scotch pine (Pinus sylvestris L.), Poplar (Populus tremula L.) and Uludag fir (Abies bornmulleriana Matff.) were used as raw materials. Phenol-formaldehyde (PF), poly (vinyl-acetate) (PVAc), polyurethane based Desmodur-VTKA (D-VTKA) and urea-formaldehyde (UF) adhesives were applied to one surface of the test samples. Bonding strength tests (based on TS EN 205) were applied on the connection surface. The test samples were machined with circular saw, band saw and thickness planer. The results indicated that the highest bonding strength was obtained from Oriental beech wood samples bonded with PVAc adhesive (14.83 N/mm(2)), while Poplar samples bonded with D-VTKA had the lowest values (2.99 N/mm(2)). In addition, the machined surface of the tangential direction had higher bonding strength than that of the radial direction. (C) 2007 Elsevier B.V. All rights reserved.Öğe GLOSSINESS, COLOR STABILITY, AND SURFACE ROUGHNESS OF WOOD TREATED WITH SOME BLEACHING CHEMICALS(State Forest Products Research Inst, 2009) Ozcifci, Ayhan; Yapici, Fatih; Altun, Suat; Toker, Hilmi; Baysal, Ergun; Senel, Ahmet; Simsek, HakanThe aim of this study was to determine the effects of different bleaching chemicals and their treatment time on glossiness, color stability, and surface roughness of wood. Spruce (Picea orientalis L.) and oak (Quercus sessiliflora Salisb.) wood specimens were bleached with aqueous solutions of 25% hydrogen peroxide (H(2)O(2)), 25% ammonia (NH(3)), and their mixture (1:1;volume:volume) for 10, 20, and 30 minutes immersing. Glossiness of wood specimens parallel and perpendicular to grain values were measured with Glossmeter at 60-degree incident angle. Color measurements and surface roughness were wade according to ISO 7724 - 2, and ISO 4287 standards, respectively. Results showed that the highest glossiness decrease (0.99) was observed in oak wood treated with ammonia solution perpendicular to grain for 20 min. immersing. The highest total color chance (18.88) was observed in oak wood treated with ammonia solution for 30 minutes immersing. All bleaching solutions increased the surface roughness of wood specimens.Öğe IMPACTS OF IMPREGNATION CHEMICALS ON FINISHING PROCESS AND COMBUSTION PROPERTIES OF ORIENTAL BEECH (FAGUS ORIENTALIS L.) WOOD(North Carolina State Univ Dept Wood & Paper Sci, 2011) Yapici, Fatih; Uysal, Burhanettin; Kurt, Seref; Esen, Rasit; Ozcan, CemalEffects of the impregnation materials borax, boric acid, and Tanalith-E on combustion properties of Oriental beech (Fagus orientalis Lipsky) were investigated. The immersion method was used for long-term impregnation (24 h). After the impregnation process, polyurethane as well as synthetic, acid hardening, and water-based varnishes were applied on the wood sample surfaces according to company's suggests. The combustion test was performed according to the ASTM-E 69 standard. The mass reduction, release of gasses (CO, NO, O-2), and the temperature differences of samples were determined for each 30 seconds during combustion. It was shown that the most mass reduction occurred when both polyurethane varnish and boric acid were applied.Öğe AN INVESTIGATION ON COMPRESSION PARALLEL TO GRAIN VALUES OF WOOD IMPREGNATED WITH SOME BORON COMPOUNDS(Slovak Forest Products Research Inst, 2008) Toker, Hilmi; Baysal, Ergun; Ozcifci, Ayhan; Altinok, Mustafa; Sonmez, Abdullah; Yapici, Fatih; Altun, SuatThis study was carried out to determine compression strength parallel to grain of wood impregnated with some boron compounds. Sodium perborate (SP) boric acid, (BA), and borax (BX) were Used as boron compounds. Wood specimens were prepared from Calabrian pine (Pinus brutia Ten.) and beech (Fagus orientalis L.) wood. Before compression test parallel to grain, wood specimens were impregnated with aqueous solutions (1, 2, 3, 4, 5, and 6 %) of boron compounds according to ASTM D 1413(1976). Results showed that compression strength parallel to grain values of wood specimens treated with boron compounds were lower compared to untreated control specimens. Borate treatments reduced compression strength parallel to grain of wood in significant level compared to untreated control. The compression strength parallel to grain values of wood specimens were the highest for untreated control specimen followed by BA, BX, and SP treated wood specimens, respectively. In general, our results showed that the higher concentration levels of boron compounds, the lower compression strength parallel to grain values of wood resulted.Öğe Modeling of Compressive Strength Parallel to Grain of Heat Treated Scotch Pine (Pinus sylvestris L.) Wood by Using Artificial Neural Network(Zagreb Univ, Fac Forestry, 2015) Yapici, Fatih; Esen, Rasit; Erkaymaz, Okan; Bas, HasanIn this study, the compressive strength of heat treated Scotch Pine was modeled using artificial neural network. The compressive strength (CS) value parallel to grain was determined after exposing the wood to heat treatment at temperature of 130, 145, 160, 175, 190 and 205 degrees C for 3, 6, 9, 12 hours. The experimental data was evaluated by using multiple variance analysis. Secondly, the effect of heat treatment on the CS of samples was modeled by using artificial neural network (ANN).Öğe Prediction of Modulus of Rupture and Modulus of Elasticity of Heat Treated Anatolian Chestnut (Castanea Sativa) Wood by Fuzzy Logic Classifier(Zagreb Univ, Fac Forestry, 2012) Yapici, Fatih; Ulucan, DundarIn this study test samples prepared from Anatolian chestnut (Castanea saliva) wood were first exposed to heat treatment at 130, 145, 160, 175, 190 and 205 degrees C for 3, 6, 9 and 12 hours. Then the values of the samples of the modulus of rupture (MOR) and modulus of elasticity (MOE) were determined and evaluated by multiple variance analysis. The aim of this study was to establish the effects of heat treatment on the MOR and MOE values of wood samples by using fuzzy logic classifier Secondly, input and output values and rule base of the fuzzy logic classifier model were built by using the results obtained from the experiment. The developed fuzzy classifier model could predict the MOR and MOE values of test samples at the accuracy levels of 92.64 % and 90.35 %, respectively The model could be especially employed in manufacturing stages of timber industryÖğe Prediction of Withdrawal Strength of Nail of Uludag Fir Wood by Using Artificial Neural Network (ANNs)(Kastamonu Univ, Orman Fak, 2012) Yapici, Fatih; Esen, Rasit; Kurt, Seref; Likos, Erkan; Erkaymaz, OkanIn this study, the effects of type of nails material and grain angle of wood on the withdrawal strength of nail have been researched. For this purpose specimens were firstly cut in different sections from Uludag Fir (Abies bornmulleriana M.) wood. The tests of static nail strength were carried out according to the standards of TS EN 13446. Secondly, an artificial neural network system was built by using data obtained in an experimental study for the prediction of withdrawal nail strength. The comparison between the experimental data and predicted data was also carried out.Öğe Some combustion parameters of wood impregnated with borates(Forest Products Soc, 2009) Toker, Hilmi; Baysal, Ergun; Ozcifci, Ayhan; Simsek, Hakan; Altun, Suat; Yapici, Fatih; Goktas, OsmanThis study was conducted to determine some of the combustion parameters of Calabrian pine and Oriental beech treated with borates. Average mass loss and temperature values of Calabrian pine and Oriental beech wood were determined according to ASTM E-69. Boric acid, borax, and sodium perborate were used as borates. Before the combustion test, wood specimens were impregnated with aqueous solutions (1%, 2%, 3%, 4%, 5%, and 6%) of borates according to ASTM D1413-76. These results showed that mass loss and temperature values of both wood specimens treated with borates were lower compared to the untreated control specimens. Higher concentration levels of borates resulted in lower mass loss and temperature values of the wood.Öğe Structural performance of the finger-jointed strength of some wood species with different joint configurations(Elsevier Sci Ltd, 2008) Ozcifci, Ayhan; Yapici, FatihThis study was conducted to evaluate the effects of adhesive type, wood species, and finger joint configurations on structural performance of the finger joint. The wood species studied were oriental beech (Fagus orientalis lipsky.), oak (Quercus robur), Scots pine (Pinus sylvestris lipsky.), poplar (Populus tremula lipsk.) and Uludag fir (Abies bormulleriana Matff.) and adhesives were poly(vinyl acetate) (PVAc), Desmodur-VTKA (D-VTKA). However, there is little information available concerning the bending strength and modulus of elasticity for finger joints in these field. In this study, it was aimed to determine the bending strength and modulus of elasticity for finger joints. For this purpose, samples were tested according to the TS EN 310 standard. It was observed that the highest bending strength and modulus of elasticity were obtained in beech control (solid wood) samples. As for the finger joints, after the control samples, the highest bending strength value (57.4 N/mm(2)) was obtained from Oriental beech wood samples having a 21 mm finger length and bonded with PVAc adhesive, the highest modulus of elasticity (8885.3 N/mm(2)) was obtained from beech wood samples having a 21 mm finger length and bonded with PVAc adhesive. As a result of the effects of finger joints on bending strength and modulus elasticity test, if the length of finger joints increases up to 21 mm, the properties of bending strength increase. (C) 2007 Elsevier Ltd. All rights reserved.
