Öz
Nondestructive methods for wood materials have been gaining importance for the last decades. Many commercial types of grading equipment are available. In this study, dynamic modulus of elasticity for red pine lumber has been measured using MTG Timber Grader. Dynamic modulus of elasticity values are compared with those which were obtained through three point bending tests. Modulus of elasticity values are classified according to TS EN 338. This classification plays an important role for sawn lumbers used in construction. The relationship between visually graded lumber and strength classes has been presented. Test results indicate that Turkish red pine lumbers can be graded according to modulus of elasticity values obtained using nondestructive method.
Keywords: Red pine, Strength classification, Nondestructive testing
Anahtar Kelimeler
Kaynakça
- Baltrusaitis, A., Pranckeviciene, V., 2003. Strength grading of the structural timber. Materials Science (Medziagotyra): 9(3): 284- 287.
- Barrett, J.D., Lam, F., Chen, Y., 2008. Comparison of machine grading methods for Canadian Hemlock. In: Proceedings of 10th WCTE Miyazaki, Japan.
- CEN (2003) EN 338 Structural timber - Strength classes
- CEN (2005) EN 14081-1 ve -2 Timber structures – Strength graded structural timber with rectangular cross section – Part 1: General requirements, Part 2: Machine grading; additional requirements for initial type testing
- Denzler, J.K., 2007. Machine strength grading – an overview over existing machines. The Future of Quality Control for Wood & Wood Products, 14-15 May 2007, Hamburg. COST Action E53
- Divos, F., Kiss, S., 2010. Strength Grading of Structural Lumber by Portable Lumber Grading - effect of knots. The Future of Quality Control for Wood & Wood Products, 4-7th May 2010, Edinburgh The Final Conference of COST Action E53
- Esteban, L.G., Fernandez, F.G., de Palacios, P., 2009. EM prediction in Abies pinsapo Boiss. timber: Application of an artificial neural network using non-destructive testing. Computers and Structures, 87, 1360–1365.
- Galligan, W.L., McDonald, K.A. 2000. Machine grading of lumber: practical concerns for lumber producers (General technical report FPL ; GTR-7):39 p.
- Köhler, J., Sandomeer, M.K., 2007. Modeling the properties of strength graded timber material. COST E 53 Conference – Quality Control for Wood and Wood Products. Warsaw, Poland.
- Rozema, P., 2007. Timber Grader MTG - Brookhuis Micro- Eletronics BV, the Netherlands.
- Steiger, R., Arnold, M. 2009. Strength grading of Norway spruce structural timber: revisiting property relationships used in EN 338 classification system. Wood Science and Technology, 43:259–278.
- TS EN 1927-2., 2009. Qualitative classification of softwood round timber- Part 2: Pines, TSE, Ankara.
- TS EN 338, 2010. Yapı kerestesi – Mukavemet sınıfları, TSE, Ankara.
- Yang, T.H., Wang, S.Y., Lin, C.J., Tsai, M.J., 2008. Evaluation of the mechanical properties of Douglas-fir and Japanese Cedar lumber and its structural glulam by non-destructive techniques. Construction and Building Materials, 22: 487-493.
Öz
Ahşap malzeme için tahribatsız muayene yöntemleri son yıllarda önem kazanmaktadır. Bu yöntemleri kullanan ticari birçok kereste sınıflandırma sistemleri geliştirilmiştir. Bu çalışmada Avrupa da ticari olarak kullanılan MTG kereste sınıflandırma cihazı kullanılarak kızılçam kerestelerinin dinamik elastikiyet modülü (EM) ölçülmüştür. Bu değerler üç nokta testinden elde edilen statik EM değerleri ile karşılaştırılmıştır. Elde edilen EM değerleri kullanılarak keresteler TS EN 338'e göre sınıflandırılmıştır. Yapısal amaçlı kullanılacak kerestelerde bu sınıflandırma işlemi büyük önem taşımaktadır. Görsel olarak ta sınıflandırılan keresteler ile direnç sınıfları arasındaki ilişki de çalışmada ortaya konulmuştur. Çalışma sonuçlarına göre kızılçam kerestesi tahribatsız olarak elde edilen elastikiyet modülüne (EM) göre sınıflandırılabilir.
Anahtar kelimeler: Kızılçam, Direnç sınıflandırması, Tahribatsız muayene
Anahtar Kelimeler
Kaynakça
- Baltrusaitis, A., Pranckeviciene, V., 2003. Strength grading of the structural timber. Materials Science (Medziagotyra): 9(3): 284- 287.
- Barrett, J.D., Lam, F., Chen, Y., 2008. Comparison of machine grading methods for Canadian Hemlock. In: Proceedings of 10th WCTE Miyazaki, Japan.
- CEN (2003) EN 338 Structural timber - Strength classes
- CEN (2005) EN 14081-1 ve -2 Timber structures – Strength graded structural timber with rectangular cross section – Part 1: General requirements, Part 2: Machine grading; additional requirements for initial type testing
- Denzler, J.K., 2007. Machine strength grading – an overview over existing machines. The Future of Quality Control for Wood & Wood Products, 14-15 May 2007, Hamburg. COST Action E53
- Divos, F., Kiss, S., 2010. Strength Grading of Structural Lumber by Portable Lumber Grading - effect of knots. The Future of Quality Control for Wood & Wood Products, 4-7th May 2010, Edinburgh The Final Conference of COST Action E53
- Esteban, L.G., Fernandez, F.G., de Palacios, P., 2009. EM prediction in Abies pinsapo Boiss. timber: Application of an artificial neural network using non-destructive testing. Computers and Structures, 87, 1360–1365.
- Galligan, W.L., McDonald, K.A. 2000. Machine grading of lumber: practical concerns for lumber producers (General technical report FPL ; GTR-7):39 p.
- Köhler, J., Sandomeer, M.K., 2007. Modeling the properties of strength graded timber material. COST E 53 Conference – Quality Control for Wood and Wood Products. Warsaw, Poland.
- Rozema, P., 2007. Timber Grader MTG - Brookhuis Micro- Eletronics BV, the Netherlands.
- Steiger, R., Arnold, M. 2009. Strength grading of Norway spruce structural timber: revisiting property relationships used in EN 338 classification system. Wood Science and Technology, 43:259–278.
- TS EN 1927-2., 2009. Qualitative classification of softwood round timber- Part 2: Pines, TSE, Ankara.
- TS EN 338, 2010. Yapı kerestesi – Mukavemet sınıfları, TSE, Ankara.
- Yang, T.H., Wang, S.Y., Lin, C.J., Tsai, M.J., 2008. Evaluation of the mechanical properties of Douglas-fir and Japanese Cedar lumber and its structural glulam by non-destructive techniques. Construction and Building Materials, 22: 487-493.
Ayrıntılar
| Birincil Dil | Türkçe |
|---|---|
| Bölüm | Orijinal Araştırma Makalesi |
| Yazarlar | |
| Yayımlanma Tarihi | 24 Eylül 2012 |
| Yayımlandığı Sayı | Yıl 2012 Cilt: 13 Sayı: 2 |
