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European Journal of Wood and Wood Products
Published in: European Journal of Wood and Wood Products 6/2003

01-12-2003 | Original Article

Prediction of MOE of eucalypt wood from microfibril angle and density

Authors: J. L. Yang, R. Evans

Published in: European Journal of Wood and Wood Products | Issue 6/2003

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Abstract

Small clear specimens of 30×30×450 mm were prepared from plantation-grown Eucalyptus globulus, E. nitens and E. regnans that were between 15 and 31 years of age. Their modulus of elasticity (MOE) and modulus of rupture (MOR) were determined using static central-point-loading bending tests. Their microfibril angle (MFA) and density were determined using SilviScan on strip samples removed from the intact portion of the specimens after the bending tests. It was found that MFA alone accounted for 87 percent of the variation in MOE, while density alone accounted for 81 percent. Together, MFA and density (as Density/MFA) accounted for 92 percent of the variation in MOE. The MFA “impact diminishing” point1 appears to be 16 degrees for the wood material of three eucalypt species in this study. Density alone accounted for 80 percent of the variation in MOR, whereas MFA had little independent influence on MOR.
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Footnotes
1
A MFA value beyond which an increase in MFA results in little further decrease in MOE.
 
2
Other forms of equations, e.g. polynomial and log relationships, could also well predict measured MOE as found in this study.
 
Literature
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Dickson RL, Walker JCF (1997) Selecting wood quality characteristics for pines. In: Proceedings of CTIA/IUFRO International Wood Quality Workshop “Timber Management Toward Wood Quality and End-Product Value”, Quebec City, Canada, 18–22 August 1997
Evans R, Ilic J (2001) Rapid prediction of wood stiffness from microfibril angle and density. For Prod J 51(3):53–57
Evans R, Ilic J, Matheson AC (2000) Rapid estimation of solid wood stiffness using SilivScan. In: Proceedings of 26th For. Prod. Res. Conf., CSIRO Forestry and Forest Products, Clayton, Australia, pp 49–50
Hirakawa Y, Yamashita K, Fujisawa Y, Nakada R, Kijidani Y (1997) The effects of S2 microfibril angles and density on MOE in sugi tree logs. Proceedings (ed. Butterfield, B.G.) IAWA/IUFRO International Workshop on the Significance of Microfibril Angle to Wood Quality, Westport, New Zealand, November 1997, pp 312–322
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Metadata
Title
Prediction of MOE of eucalypt wood from microfibril angle and density
Authors
J. L. Yang
R. Evans
Publication date
01-12-2003
Publisher
Springer-Verlag
Published in
European Journal of Wood and Wood Products / Issue 6/2003
Print ISSN: 0018-3768
Electronic ISSN: 1436-736X
DOI
https://doi.org/10.1007/s00107-003-0424-3

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