Influence of wood grain variations on some physical and mechanical properties of laminated veneer lumber

Elif Duran; Vedat Çavuş

Article Details

Influence of wood grain variations on some physical and mechanical properties of laminated veneer lumber

Authors:

Elif Duran | Vedat Çavuş

Publisher:

Isparta University of Applied Sciences

Main Topics:

Ahşap İşleme

Journal:

Turkish Journal of Forestry Vol.26 Issue 1, pp.65-76

Document Type:

Article

Publication Date:

3/2025

Document Language:

Turkish

Document ID (Org No.):

2001344382

pISSN:

2149-3898

Keywords:

Abstract:

 Laminated veneer lumber is a composite of layers of wood veneers and glues. Laminated veneer lumber, which is a building material, is formed by gluing the veneers obtained by peeling method by aligning them parallel to each other in the fiber direction. In this study, some physical and mechanical properties of laminated veneer lumber produced with Eastern Beech Fagus orientalis L. and the fiber orientation was changed at different angles in certain layers were investigated. Polyurethane glue was preferred in this study. For the experiments, 1 control group and 2 experimental groups were prepared. The laminated veneer lumber was produced in 11 layers. In the manufacturing of the test specimens, the fiber orientation of the laminated veneer lumber was produced as Control, 0900 and 090450 to coincide with the tensile direction opposite to the compression direction. The specimens were tested for physical properties such as air and oven dry density, water absorption and thickness swelling, and mechanical properties such as flexural strength, flexural modulus of elasticity, dynamic flexural strength, Janka hardness, screw holding capacity and tensile shear strength. It was found that fiber orientation causes a decrease in the physical and mechanical properties of laminated veneer lumber. It was determined that for the control, 0900 and 090450 test specimen groups; 3.8, 32.4, 15.42, 26.08, 9.67 and 9.31 decrease occurred in bending resistance values, modulus of elasticity in bending values, dynamic bending resistance values, respectively. For the control, 0900 and 090450 test specimen groups; 2.48, 14.44, 40, 31.52, 4.21, 28.13, 4.21 and 28.13 decrease in static hardness values, tensile-shear resistance, and screw holding capacity, respectively.

 Laminated veneer lumber is a composite of layers of wood veneers and glues. Laminated veneer lumber, which is a building material, is formed by gluing the veneers obtained by peeling method by aligning them parallel to each other in the fiber direction. In this study, some physical and mechanical properties of laminated veneer lumber produced with Eastern Beech Fagus orientalis L. and the fiber orientation was changed at different angles in certain layers were investigated. Polyurethane glue was preferred in this study. For the experiments, 1 control group and 2 experimental groups were prepared. The laminated veneer lumber was produced in 11 layers. In the manufacturing of the test specimens, the fiber orientation of the laminated veneer lumber was produced as Control, 0900 and 090450 to coincide with the tensile direction opposite to the compression direction. The specimens were tested for physical properties such as air and oven dry density, water absorption and thickness swelling, and mechanical properties such as flexural strength, flexural modulus of elasticity, dynamic flexural strength, Janka hardness, screw holding capacity and tensile shear strength. It was found that fiber orientation causes a decrease in the physical and mechanical properties of laminated veneer lumber. It was determined that for the control, 0900 and 090450 test specimen groups; 3.8, 32.4, 15.42, 26.08, 9.67 and 9.31 decrease occurred in bending resistance values, modulus of elasticity in bending values, dynamic bending resistance values, respectively. For the control, 0900 and 090450 test specimen groups; 2.48, 14.44, 40, 31.52, 4.21, 28.13, 4.21 and 28.13 decrease in static hardness values, tensile-shear resistance, and screw holding capacity, respectively.

 Laminated veneer lumber is a composite of layers of wood veneers and glues. Laminated veneer lumber, which is a building material, is formed by gluing the veneers obtained by peeling method by aligning them parallel to each other in the fiber direction. In this study, some physical and mechanical properties of laminated veneer lumber produced with Eastern Beech Fagus orientalis L. and the fiber orientation was changed at different angles in certain layers were investigated. Polyurethane glue was preferred in this study. For the experiments, 1 control group and 2 experimental groups were prepared. The laminated veneer lumber was produced in 11 layers. In the manufacturing of the test specimens, the fiber orientation of the laminated veneer lumber was produced as Control, 0900 and 090450 to coincide with the tensile direction opposite to the compression direction. The specimens were tested for physical properties such as air and oven dry density, water absorption and thickness swelling, and mechanical properties such as flexural strength, flexural modulus of elasticity, dynamic flexural strength, Janka hardness, screw holding capacity and tensile shear strength. It was found that fiber orientation causes a decrease in the physical and mechanical properties of laminated veneer lumber. It was determined that for the control, 0900 and 090450 test specimen groups; 3.8, 32.4, 15.42, 26.08, 9.67 and 9.31 decrease occurred in bending resistance values, modulus of elasticity in bending values, dynamic bending resistance values, respectively. For the control, 0900 and 090450 test specimen groups; 2.48, 14.44, 40, 31.52, 4.21, 28.13, 4.21 and 28.13 decrease in static hardness values, tensile-shear resistance, and screw holding capacity, respectively.

 Tabakalı kaplama kereste TAK, odun kaplamalarının ve tutkalların katmanlarını oluşturduğu kompozitlerdir. Bir yapı malzemesi olan TAK, soyma yöntemi ile elde edilen kaplamaların lif yönünde birbirlerine paralel olarak sıralanarak yapıştırılmasıyla oluşur. Bu çalışmada Doğu Kayını Fagus orientalis L. ile üretilmiş ve belirli katmanlarda lif yönü farklı açılarla değiştirilmiş TAKın bazı fiziksel ve mekanik özellikleri araştırılmıştır. Bu çalışmada poliüretan tutkalı tercih edilmiştir. Denemeler için 1 adet kontrol grubu ve 2 adet deney grubu oluşturulmuş, TAK 11 tabakalı olarak üretilmiştir. Deney numunelerin üretiminde basma yönünün karşında bulunan çekme yönüne denk gelecek şekilde TAKın lif yönü değişikliği kontrol, 0900 ve 090450 olacak şekilde deney numuneleri üretilmiştir. Üretilen deney numunelerinin fiziksel özelliklerden hava ve fırın kurusu yoğunluk, su alma ve kalınlıkça artış denemeleri ile mekanik özelliklerden eğilme direnci, eğilmede elastikiyet modülü, dinamik eğilme direnci, Janka , vida tutma kapasitesi ile çekme-makaslama direnci tespit edilmiştir. Lif yönü değişikliğinin TAKın fiziksel ve mekanik özelliklerinde azalmaya neden olduğu tespit edilmiştir. Kontrol, 0900 ve 090450 deney numune gurupları için sırasıyla; Eğilme direnci değerlerinde, 3,8, 32,4, eğilmede elastikiyet modülü değerlerinde 15,42, 26,08, dinamik eğilme direnci değerlerinde 9,80 oranında azalma meydana geldiği tespit edilmiştir. Kontrol, 0900 ve 090450 deney numune gurupları için sırasıyla; statik sertlik değerlerindeki 2,48, 14,44, çekme-makaslama direnci 40, 31,52 ve vida tutma kapasitesi 4,21 28,13 oranında azalma meydana geldiği tespit edilmiştir.

Article Details

Influence of wood grain variations on some physical and mechanical properties of laminated veneer lumber

Authors:

Elif Duran | Vedat Çavuş

Publisher:

Isparta University of Applied Sciences

Main Topics:

Ahşap İşleme

Journal:

Turkish Journal of Forestry Vol.26 Issue 1, pp.65-76

Document Type:

Article

Publication Date:

3/2025

Document Language:

Turkish

Document ID (Org No.):

2001344382

pISSN:

2149-3898

Laminated veneer lumber

Physical properties

Mechanical properties

Grain orientation

Polyurethane adhesiveTabakalı kaplama kereste

Fiziksel özellikler

Mekanik özellikler

Lif yönü

Poliüretan tutkal

Issues

Article Details

Authors: Elif Duran | Vedat Çavuş

Publisher: Isparta University of Applied Sciences

Main Topics: Ahşap İşleme

Journal: Turkish Journal of Forestry Vol.26 Issue 1, pp.65-76

Document Type: Article

Publication Date: 3/2025

Document Language: Turkish

Document ID (Org No.): 2001344382

pISSN: 2149-3898

Issues

Authors:

Elif Duran | Vedat Çavuş

Publisher:

Isparta University of Applied Sciences

Main Topics:

Ahşap İşleme

Journal:

Turkish Journal of Forestry Vol.26 Issue 1, pp.65-76

Document Type:

Article

Publication Date:

3/2025

Document Language:

Turkish

Document ID (Org No.):

2001344382

pISSN:

2149-3898