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Effects of moisture content on elastic constants of fir wood

Authors
  • Yilmaz Aydin, T.1
  • Ozveren, A.1
  • 1 Applied Sciences University of Isparta, Department of Forest Industrial Engineering, Faculty of Forestry, Isparta, Turkey , Isparta (Turkey)
Type
Published Article
Journal
European Journal of Wood and Wood Products
Publisher
Springer Berlin Heidelberg
Publication Date
Oct 19, 2018
Volume
77
Issue
1
Pages
63–70
Identifiers
DOI: 10.1007/s00107-018-1363-3
Source
Springer Nature
License
Yellow

Abstract

In this study, the effect of moisture on elastic properties of fir wood (Abies cilicica Carr.) was investigated. Three moduli of elasticity in principal directions (EL, ER, ET), six Poisson’s ratios (υLR, υLT, υRT, υTR, υRL, υTL) and three shear moduli (GLR, GRT, GLT) were determined using compression tests. Compression strength in principal directions was also determined. Clear and small wood specimens were conditioned at 20 °C and 45, 65 and 85% relative humidity. Stress–strain curves of the samples were obtained using bi-axial extensometer in order to calculate elastic constants. Test results indicated that moisture content significantly reduced the measured properties except for Poisson’s ratio. The elastic modulus in the three principal directions is significantly different. Well-known order of EL > ER > ET for elasticity, and L > T > R for compression strength is valid. Shear modulus obeys the GLR > GLT > GRT rule. The results of this study can provide sufficient data for modeling of the elements or system’s behavior under load using fir wood.

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