Comparative Analysis of Stiffness of Some Commercially Available Timbers in Awka Anambra State, Nigeria Using Cantilever
C. C. Onuchukwu *
Department of Industrial Physics, Chukwuemeka Odumegwu Ojukwu University, Anambra State, Nigeria.
I. A. Ezenwa
Department of Industrial Physics, Chukwuemeka Odumegwu Ojukwu University, Anambra State, Nigeria.
N. L. Okoli
Department of Physics, Legacy University Okija, Anambra State, Nigeria.
*Author to whom correspondence should be addressed.
Abstract
We studied the physical properties of some commercially available wood in Nigeria. The wood samples include Gmelina, Mahogany (Khayalvorensis), Black Oak, Iroko (Melicea Excels), Afara, Bamboo (Bambusoideae), Achi, Bitterkola, Ubia and Mba. The wood sample were initially machined and trimmed to about in width and about thickness. The wood samples were then soaked in water in an air-tight container for four weeks (these were taken as the wet wood sample). The weights of the wood samples were determined with a digital weighing balance; the lengths were measured with a meter rule. The width and the thickness were measured using a Vernier caliper and micrometer screw gauge respectively. The wood sample were then subjected to a simple cantilever test to determine their Young Modulus which is a measure of the stiffness of the wood. The wood sample were then dried in open air (but not directly under the sun) for eight weeks (these were taken as the dry wood sample) and the experiment repeated. The results of the test showed that stiffness of a wood depends on its specie and hence different wood species have different stiffness characteristics. Iroko wood have the highest Young Modulus when dried while Melina wood is stronger when wet than when dry. The result obtained in this study has provided qualitative/quantitative information on the physical properties of these selected wood species which can be used in determining their applications for either building, construction or for any other purposes such as the in the making of furniture.
Keywords: Nigeria timber species, physical properties, mechanical properties, characterization, structural applications
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References
Jimoh AA, Aina ST. Statistical analysis of properties of timber species for structural use. Journal of EEA. 2017a;35:8 – 16.
Jimoh AA, Aina ST. Characterization and grading of two selected timber species grown in Kwara State Nigeria. Nigerian Journal of Technology (NIJOTECH). 2017b;36(4):1002 – 1009.
Jamala GY, Olubunmi SO, Mada DA, Abraham P. Physical and mechanical properties of selected wood species in tropical rainforest ecosystem, Ondo State, Nigeria. Journal of Agriculture and Veterinary Science. 2013;5(3):29 – 33.
Winandy JE. Effects of long-term elevated temperature on CCA-treated Southern Pine lumber. Forest Products Journal. 1994;44(6):49–55.
Christoforo AL, Mello da Silva SA, Panzera TH, Lahr FAR. Estimative of Wooden Toughness by the Apparent Density and Bending Strength. International Journal of Materials Engineering. 2014;4(2):49-55.
Kollmann FFP, Côté AJ. Principles of wood science and technology: Solid wood 1. Springer Berlin Heidelberg, ISBN 3540042970, 9783540042976. 1984;592.
Alteyrac J, Cloudier A, Ung CH, Zhang SY. Mechanical properties in relation to selected wood characteristics of black spruce Wood and Fiber Science. 2006; 38(2):229-237.
Grvc V, Horáček P. Variability in density of spruce (Picea abies [L.] Karst.) wood with the presence of reaction wood. Journal of Forest Science. 2007;53(3):129-137
Chauhan SS, Walker JCF. Variation in acoustic velocity and density with age and their interrelationships in Radiata Pine - Forest Ecology and Management – Elsevier Acoustic velocity by the Fakopp time of flight (ToF) tool was used to estimate outer wood stiffness of trees within stands and between stands of different age classes; 2006.
General Technical Report, FPL-GTR-190, USDA Forest Service, Forest Products Laboratory, Madison WI, American Chemical Society, Washington, DC, White RH, Dietenberger MA. (2010) Fire safety of wood construction. 2010;531–574.
Forest Products Laboratory. Wood Handbook – Wood as an Engineering Material. General Technical report FPL – GTR – 190. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest products Laboratory. 2010;508.
Bowyer JL, Shmulsky R, Haygreen JG. Forest Product and Wood Science: An Introduction, Blackwell Publishing, 2121 State, Avenue, Ames, Iowa, USA; 2003. (www. blackwell-professional. com)
Simpson W, TenWolde A. Wood handbook: wood as an engineering material. Madison, WI: USDA Forest Service, Forest Products Laboratory, 1999. General technical report FPL; GTR-113. 1999;3.1-3.24.
Zobel BJ, van Buijtenen JP. Wood Variation and Wood Properties, Springer Series in Wood Science book series (SSWOO); 1989a. DOI: 10.1007/978-3-642-74069-5_1
Zobel BJ, van Buijtenen JP. Variation within and among trees. Springer Series in Wood Science book series (SSWOO); 1989b. DOI: 10.1007/978-3-642-74069-5_3