Nihat Dongel

Gazi University · Department of Wood Products Industrial Engineering

Yapılan çalışmada, dış katmanı meşe ve sarıçam, iç katmanı ise sarıçam ve göknar odunlarından olan farklı kombinasyonlar ile polivinil asetat (PVAc) ve poliüretan (PU) tutkalları kullanılarak üretilen lamine kerestelerinin hava kurusu yoğunluk değerleri, statik eğilme direnci ve eğilmede elastikiyet modülü değerleri, deneysel yöntemlerle incelenmiş...

In this study, the modulus of elasticity and flexural strength properties of laminated wood elements reinforced with steel mesh with different mesh openings were determined. In accordance with the purpose of the study, three- and five-layer laminated elements were produced from scotch pine (Pinus sylvestris L.) wood material, which is widely used i...

This study aimed to determine the effect of different wood flooring layer structures and surface features on water intake, shrinkage, and swelling rates under different relative humidity and water retention conditions. Nine wood flooring sample types were tested: solid wood beech (Fagus orientalis L.) flooring covered with polyurethane varnish, fou...

Doğal kaynaklarımızın hızla tükenmesi ve enerji üretiminin yüksek maliyeti bizi enerji tasarrufu konusunda çok daha duyarlı olmaya itmektedir. Enerji korunumunda ısı yalıtımı, etkin ve ekonomik önlemlerin başında gelmektedir. Bu çalışmada, ahşap ürünlerin ve kaplama malzemelerinin üretilmesinde yaygın olarak kullanılan ahşap ve ahşap esaslı levhala...

Bu çalışmada, ağaçişleri ve mobilya endüstrisi için geliştirilen farklı özelliklerde PVAc esaslı tutkalların yapışma performanslarının belirlenmesi amaçlanmıştır. Bu maksatla, farklı özeliklerde (katı madde miktarı, dolgu malzemesi) üretilen 3 adet PVAc tutkalı, karşılaştırma ve kontrol maksadıyla piyasadan rastgele temin edilen 1 adet PVAc tutkalı...

In scope of the study, behavior of timber-framed shear walls having openings with variable dimensions and locations subjected to reverse cyclic loading is experimentally investigated. Main variables considered in the study are the aspect ratios of timber-framed panel walls, dimensions and locations of the openings on the panel walls, material of th...

Bu çalışmada, ilk uygulamaları Selçuklu ve Osmanlı dönemlerine kadar uzanan ve günümüzde cami mimarisinin kapı, pencere kepengi ve minber gibi önemli ahşap unsurlarının yapımında kullanılan kündekâri tekniğinin mühendislik yaklaşımıyla irdelenmesi amaçlanmaktadır. Bu amaca uygun olarak, geçmiş dönemlerde kündekâri tekniğinde yapılmış ve halihazırda...

In this study, the main entrance door and window shutters of the Murat Pasha Mosque, which is one of the most ancient Ottoman structures of Erzurum and which had been built during 2 nd Selim time, have been investigated. It is aimed to specify the construction techniques, ornament style, type of accessory and the restoration status of the main entr...

In this study, thermal conductivity properties of solid wood and wood-based flooring materials were investigated. For this purpose, total nine kinds of sample consisting of three kinds of solid parquet prepared from wood of yellow pine (Pinus silvestris L.), oriental beech (Fagus orientalis L.), and oak (Quercus petreae L.); three kinds of laminate...

Worldwide furniture production is approximately 473 billion dollar, 173 billion of its exports, while 174 billion dollar has been mentioned in trade in imports. Consumption is 466 billion dollar. A total of 4,475 trillion dollars for production and 4,509 trillion dollars for consumption in the last 10 years have created significant volumes in the w...

This study aims to determine the bonding performance of newly developed PVAc based adhesives for wood products and furniture industry. For this purpose, total 4 types of samples were chosen; 3 types of PVAc adhesives, produced with different properties (solids content, filler material, MFFT value) and a control sample of PVAc adhesive which were ra...

This study aims to determine the bonding strength of laminated wood elements supported with various materials. With this objective, wood paper veneers with the thickness of 2 mm with 9 layers were prepared from Scots pine (Pinus Sylvestris L.) wood, which is used extensively in Turkey, and were glued with PVAc-D3 adhesive by placing 3 types of supp...

zet Bu çalışmada, Sapelli (Entandrophragma cylindricum) odunundan radyal ve teğet kesiş yönünde hazırlanan örneklerin yüzeylerine uygulanan poliüretan, tek bileşenli su bazlı, çift bileşenli su bazlı ve sentetik verniklerin aşınma ve çizilme direncinin belirlenmesi amaçlanmıştır. Aşınma direncinin belirlenmesinde TS EN 15185, çizilme direncinin bel...

Laminated composite wooden construction elements were produced with 7 layers of Scots pine (Pinus sylvestris L.). Fiberglass wire mesh and aluminum wire mesh, which were used as reinforcement materials, were pressed with polyvinyl acetate (PVAc) and polyurethane-type adhesives between each Scots pine layer. The highest bonding strength values were...

In this study, the main entrance door and window shutters of the Murat Pasha Mosque, which is one of the most ancient Ottoman structures of Erzurum and which had been built during 2 nd Selim time, have been investigated. It is aimed to specify the construction techniques, ornament style, type of accessory and the restoration status of the main entr...

This study determines application problems of restoration for wooden structures and puts suggestions for the identified problems. A questionnaire was developed in accordance with the aim of the study to determine of the application problems in the restoration of wooden structures and structural elements in various cities of Turkey. According to...

In the study, it is aimed at determining the performance characteristics of the single dowel, double dowel, and without socket frame corner joints, used in the furniture frame corner cover, subjected to diagonal tension and diagonal compression, and comparing the data gathered through FEM (Finite Element Method). The standard MDF panels overlaid wi...

In this study, the effects of surface roughness of wood material on the adhesion strength of varnish layers have been tested. For this purpose, test samples of beech (Fagus orientalis L.), Scots pine (Pinus sylvestris L.), and cherry (Prunus cerasus) wood species were prepared and sanded with 80, 120, and 180 grit abrasives. The surface roughness v...

Hysteretic responses of timber framed shear walls are experimentally investigated in this study. The variables considered in the study are presence of openings with varying dimensions, presence of horizontal retrofitting elements and aspect ratios of timber framed shear walls. The data obtained from the tests conducted on timber framed shear walls...

This study aims to determine performance characteristics of an H-type socket and dovetail type socket frame corner joints, used in the furniture frame corner cover, subjected to diagonal tension and diagonal compression, and comparing the data gathered through FEM (Finite Element Method). The standard MDF panels overlaid with PVC were used for the...

This study determines application problems of restoration for wooden structures and puts suggestions for the identified problems. A questionnaire was developed in accordance with the aim of the study to determine of the application problems in the restoration of wooden structures and structural elements in various cities of Turkey. According to the...

This study investigated the effects of heat treatment, following optional treatment with synthetic, water-based, and alkyd varnishes, on the pull-off strength of wooden materials sampled from oriental beech (Fagus orientalis L.), oak (Quercus petraea Liebl.), black poplar (Populus nigra L.), pine (Pinus sylvestris L.), and fir (Abies bornmulleriana...

The goal of the performed experiments was to determine the strength, stiffness, and modulus of the elasticity of dowel, mortise and loose-tenon, and mortise and tenon L-type furniture joints under diagonal tension and compression loads. The specimens were constructed from Turkish beech (Fagus orientalis L.), white oak (Quercus alba), and white waln...

This study was performed to determine the effects of varnishing after impregnation with boron compounds on the combustion properties of Scotch pine. For this purpose, test samples prepared from Scotch pine (Pinus sylvestris Lipsky) wood were impregnated according to ASTM-D 1413-99 standard with boric acid (Ba) and borax (Bx) by vacuum technique. Af...

Bu çalışmada, İstanbul’daki Mimar Sinan camilerinde bulunan ve klasik Osmanlı döneminin karakteristik özelliklerini taşıyan ahşap kapı ve pencere iç kepenklerinin malzeme, boyut, süsleme ve yapım tekniği bakımından incelenmesi amaçlanmıştır. Bu amaca uygun olarak geliştirilen envanter formu yardımı ile İstanbul’da bulunan, 1543-1589 yılları arasınd...

Bu çalışmada, Türkiye Mobilya Sektöründe kalite ve standartlaşmanın pazarlamaya etkilerinin belirlenmesi amaçlanmıştır. Bu maksatla araştırmanın amacına uygun olarak geliştirilmiş olan ayrıntılı anket, Ankara, Bursa ve Kayseri illerinde faaliyet gösteren orta ve büyük ölçekli işletmeler arasından tesadüfî yöntemle seçilen 51 mobilya işletmesinin ka...

In this study, Scotch pine (Pious sylvestris L.), Oriental beech (Fagus orientalis L.), Oriental spruce (Picea orientalis L.), Uludag fir (Abies bornmulleriana Mattf), Sessile oak (Quercus petraea Lieble) and Calabrian pine (Pinus brutia Ten) woods were impregnated with 5 %, 7.5 % and 10 % sodium borate solution produced by the National Boron Insti...

The primary purposes of this paper were to provide data and information about the education system in respect to the responsiveness of vocational and technical teacher education in Turkey. The wide extant research literature and a survey of institutional members of the Higher Education Council and Ministry of education on Vocational Education provi...

In this study, Computer Aided Design (CAD) education in the department of Furniture and Design, Technical Education Faculty, Gazi University, raises workforce for furniture industry and interior design sector, was investigated. A research questionnaire was developed and carried out with the students in accordance with the determination of problems,...

In this study, the process of impregnated wood material effect on surface roughness and color change were investigated. Specimens were prepared from Oriental beech (Fagus orientalis L.), Oriental spruce (Picea orientalis L.) Calabrian pine (Pinus brutia Ten) woods with this objective. Examples were impregnated by subjecting to diffusion in the solu...

In this study, the effects of wood species, adhesive types and pressing direction on diagonal tensile strength performance in the wooden window corner joints with single or double mortise and tenon were examined. Specimens of single and double mortise and tenon corner joints were prepared from Scotch pine (Pinus Sylvestris Lipsky) and Uludağ fir (A...

ZET Bu çalışmada, kuru sıcaklığın masif ahşap ve ahşap esaslı döşeme kaplama malzemelerinde parlaklık ve renk değiştirici etkisi araştırılmıştır. Bu maksatla, poliüretan parke verniği ile kaplanmış Doğu kayını (Fagus orientalis L.) masif parke, UV kurumalı poliüretan vernikle kaplanmış lamine parke ve orta katmanı yüksek yoğunlukta liflevha (HDF) o...

This research was carried out in the 64 furniture manufacturing companies with the medium and large scales in the Siteler region of Ankara. This research aims to determine the opinions of customers regarding the interaction of technological products such as cooker, oven, and computer with interior elements manufacturing in the selected furniture co...

In this study, technical properties of solid wood and wood based floor covering materials were investigated. For this aim, totally 9 types samples were prepared from beech (Fagus orientalis L.) solid wood parquet covered with polyurethane varnish, 4 types laminated wood parquets which have different layer materials (solid wood, MDF and plywood) cov...

ZET Kaplama üretimi, ağaç işleri endüstrisinde önemli bir sektör faaliyetidir. Geleneksel üretim teknikleriyle üretilen kaplamalarda renk, desen, doku ve ölçü seçenekleri sınırlıdır. Geniş mekanlarda yapılan dekorasyon uygulamalarında renk, desen ve doku beraberliğinin sağlanmasındaki güçlükler kaplama üretiminde bazı teknik çalışmaların yapılmasın...

In this study, it has been researched to effects of bending resistance the species of wood, glue type and number of layer in laminated wood material, using table,coffee table foots and sitting furniture. For this purpose; it was tested to determine the bending resistance of experimentals prepared from 3, 5 and 7 lahyers materials, which are widely...