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Some orthotropic mechanical properties of Sessile oak (Quercus petrea) as influenced by moisture content

Ergün Güntekin, Tuğba Yılmaz Aydın, Peter Niemz
1.518 384


In this study, the influence of moisture content on some orthotropic mechanical properties of sessile oak which is one of the most important wood species grown in Turkey and common in the furniture industry have been investigated. The properties studied include Young’s modulus, Poisson’s ratios and compression strength of oak wood in three anatomical directions. These properties are important input parameters for three dimensional modeling of mechanical behavior in advanced computer programs such as finite elements. The samples which were approximately 20 x 20 x 60 mm in dimensions were conditioned at 20 °C and 50, 65, 85, 95 % relative humidity conditions for 6-8 weeks and subjected to compression tests in order to determine elastic and strength properties. Results indicate that properties investigated significantly differ among all anatomical directions. Young’s modulus ranged from 10305 to 6984 N/mm2 in L direction, from 2032 to 1132 N/mm2 in R direction and from 1208 to 715 in T direction. Compression strength varied between 48.5 and 25.5 N/mm2 in L direction, 16.45 and 9.60 MPa in R direction, and 10.2 and 7.1 in T direction. Poisson’s ratios are found to be in between 0.061 and 0.7. Results indicated that all properties of the samples tested were strongly affected by moisture content. 

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Berkel, A. (1970). Ağaç Malzeme Teknolojisi. İ.Ü. Orman Fakültesi Yayınları, İstanbul.

Bodig, J., Jayne, B. A. (1993). Mechanics of Wood and Wood Composites. Malabar, USA: Krieger Publishing Company, 1993.

Dinwoodie, J.M. (2000). Timber: Its Nature and Behavior. E & FN Spon, London.

Dündar, T., (2002). Demirköy yöresi ıstranca meşelerinin (Quercus hartwissiana stev.) mekanik özellikleri. İstanbul Üniversitesi Orman Fakültesi Dergisi, 51(2), 159-172.

Gerhards, C.C. (1982). Effect of moisture content and temperature on the mechanical properties of wood: An analysis of immediate effects. Wood and Fiber Science 14(1), 4-36.

Güntekin, E., Yılmaz Aydın, T., Niemz, P. 2016. Some orthotropic elastic properties of Fagus orientalis as influenced by moisture content. Wood Research, 61 (1), 95-104.

Hering, S., Keunecke, D., Niemz, P. (2012a). Moisture-dependent orthotropic elasticity of beech wood. Wood Sci. Technol,.45, 927 – 938.

Hering, S., Saft, S., Resch, E., Niemz, P., Kaliske, M. (2012b). Characterization of moisture-dependent plasticity of beech wood and its application to a multi-surface plasticity model. Holzforschung, 66, 373–380.

Jeong, G.Y., Hindman, D.P., Zink-Sharp, A., 2010. Orthotropic properties of loblolly pine (Pinus taeda) strands. J Mater Sci (45), 5820–5830.

Keskin, H., 2004. Sapsız meşe (Quercus petraea liebl.) ve sarıçam (Pinus sylvestris lipsky) kombinasyonu ile üretilmiş lamine ağaç malzemelerin bazı teknolojik özellikleri ve kullanım imkanları. G.Ü. Fen Bilimleri Dergisi, 17(4), 121-13.

Keunecke, D., Hering, S., Niemz, P. (2008). Three-dimensional elastic behavior of common yew and Norway spruce. Wood Science Technology, 42, 633-647.

McBurney ,R.S., Drow, J.T. (1962). The Elastic Properties Of Wood: Young’s Moduli and Poisson’s Ratios of Douglas-fir and Their Relations to Moisture Content. Report No. 1528-D. U.S. Dept. Of Agriculture, Forest Service, Forest Products Laboratory Madison, Wisconsin.

Mizutani, M., Ando, K., 2015. Influence of a wide range of moisture contents on the Poisson’s ratio of wood. J Wood Science, (61), 81-85.

Munoz, G.R., Gete, A.R., 2011. Relationships between mechanical properties of oak timber (Quercus robur L.). Holzforschung, 65, 749-755.

Panshin, A.J., de Zeeuw, C. (1980). Textbook of Wood Technology. McGraw-Hill, Inc. New York.

Ozyhar, T., Hering, S., Niemz, P. (2013a). Moisture-dependent orthotropic tension compression asymmetry of wood. Holzforschung; 67(4), 395–404.

Ozyhar, T., Hering, S., Niemz, P. (2013b). Viscoelastic characterization of wood: Time dependence of the orthotropic compliance in tension and compression. Journal of Rheology. (57), 699-715.

Perçin, O., Sofuoğlu. S.D., Uzun, O., (2015). Effect of boron impregnation and heat threatment on some mechanical properties of oak (Quercus petrea liebl.) wood. Bioresources, 10(3), 3963-3978.

Ross, R.J., 2010. Wood Handbook: Wood as an Engineering Material. General Technical Report. FPL-GTR 190, U.S. Department of Agriculture, Forest Service, Forest Products Laboratory, Madison, WI.




ISSN: 2147-7493