Relation Between Static and Dynamic Modulus of Elasticity of Wood
DOI:
https://doi.org/10.37045/aslh-2005-0009Keywords:
modulus of elasticity, static and dynamic determination, creep wood, rugalmassági modulusz, statikus és dinamikus meghatározás, kúszás, faanyagAbstract
Static and dynamic modulus of elasticity (MOE) of spruce lumber were determined under different conditions like cross head speed, bending and longitudinal vibration, and mode numbers. The characteristic time of MOE determination is introduced. Characteristic time is defined as the typical MOE determination time. Shorter characteristic times are shown to result in higher MOE values. An order of magnitude change in characteristic time resulted in a 1.7% change in MOE. We found clear evidence that creep exists on a short time scale.
References
HEARRMON R.F.S., (1966): Vibration testing of wood. Forest Products Journal 16 (8): 29-40.
JUGO, I. – OZARSKA, B. (1996): Nondestructive evaluation of propertes of reconstituted wood products used in Australia. 10th 8th International Symposium on Nondestructive Testing of Wood. Swiss Federal Institute of Technology, Lausanne, Switzerland.
KLIGER, R. – PERSTORPER, M., JOHANSSON G. (1992): Stiffness in structural timber - effect according to position in the stem. Proc. IUFRO S5.02 Timber Engineering Meeting, Laboratorie de Rheologie du Bois de Bordeaux, Bordeaux, France.
NAKAO T. et al. (1995): Experimental study of flexural vibration of wooden beams by Levison beam theory. Journal of Vibration and Acoustics 117: 378-379.
PERSTORPER, M. (1994): Strength and stiffness prediction of timber using conventional and dynamic methodes. Proc. First European Symposium on Nondestructive evaluation of Wood, University of Sopron, Sopron, Hungary.
RAYLEIGH, L. (1945): Theory of Sound. Vol. 1, 2nd edition, Macmillan, New York.
TANAKA, T. – NAGAO, H. – NAKAI, T. (1991): Nondestructive evaluation of bending and tensile strength by longitudinal and transverse vibration of lumber. Proc. 8th International Symposium on Nondestructive Testing of Wood, Conferences and Institutes, Washington State University, Pullman, USA.
TIMOSHENKO S. – YOUNG D.H. (1954): Vibration problems in engineering. 3rd edition, Van Nostrand, New York.
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 2005 Acta Silvatica & Lignaria Hungarica
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
ACTA SILVATICA & LIGNARIA HUNGARICA 