Summary
Dynamic methods provide rapid and accurate means to determine Young's modulus, i.e. the modulus of elasticity, of wood. For dry, clear specimens of épicéa commun (Norway spruce, picea excelsa) and sapin pictiné (silver fir, abies amabilis) we present a comparison of results from tests by a resonance flexure method with results obtained from four-point static flexure tests. For a wide range of specimen size the resonance flexure method provides a simpler, more rapidly performed alternative to the classical static flexure method, giving Young's modulus values which are for the spruce and fir specimens of this study, nearly identical to those calculated from the static flexure tests. Results are also presented which show that a resonance longitudinal method yields higher values of Young's modulus and an ultrasonic method yields still higher values. We provide also a comparison of the four test methods applied to isotropic materials.
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Arima, T.; Nakamura, N.; Maruyawa, N.; Hayamura, S. 1991: Classification of logs based on sound analysis and its application in product processing. Proc. Int. Timber Eng. Conf., London 2: 266–2,2.273
Bordonne, P. A. 1989: Module dynamique et frottement intérieur dans le bois mesures sur poutres flottantes en vibrations naturelles. Doctoral thesis, l'Institut National Polytechnique de Lorraine, Nancy
Brenndorfer, D. 1972: Nondestructive testing of wood with acoustic vibrations. Industria Lemn. 6: 234–240
Bucur, V. 1985: Ultrasonic velocity, stiffness matrix and elastic constants of wood. CAS Journal 44: 23–28
Chantre, G. 1989: Liaison entre rigidité et densité du bois a l'intérieur du cerne. DEA Etude (Masters Thesis) INRA, Nancy
Chui, Y. H. 1991: Simultaneous evaluation of bending and shear moduli of wood and the influence of knots on these parameters. Wood Sci. Technol 25: 125–134
Curie, P. 1989: Essais comparatif pour la mesure du module d'élasticité. Provisional report of the Centre Technique Forestier Tropical, Nogent-sur Marne
Dunlop, J. I. 1980: Testing of particleboard by acoustic techniques. Wood Sci. Technol 14: 69–78
Dunlop, J. I. 1978: Damping loss in wood at midkilohertz frequencies. Wood Sci. Technol. 12: 49–62
Ferry, J. D., Viscoelastic Properties of Polymers, John Wiley & Sons, New York, 1961, p. 420
Gerhards, C. 1982: Longitudinal stress waves for lumber stress grading: factors affecting applications. States of art. Forest Prod. J. 32(2): 20–35
Haines, D. W. 1979: On musical instrument wood, CAS Newsletter 31: 23–32
Haines, D. W. 1980: On musical instrument wood — Part II, surface finishes, plywood, light and water exposure. CAS Newsletter 3: 19–23
Hearmon, R. F. S. 1948: Elasticity of wood and plywood Forest Prod. Res. Spec. Rep. No. 7. His Majesty's Stationery Office, London, 87 pp
Hearmon, R. F. S. 1965: The assessment of wood properties by vibrations and high frequency acoustic waves. Proc. 2nd Symp. on the NDT of wood, Washington State University, 49–65
Kolsky, H.; Stress Waves in Solids, Dover, New York, 1963, p. 121
Moore, G. R.; Kline, D. E.; Blankerhorn, P. R. 1983: Dynamic mechanical properties of epoxy poplar composite materials. Wood Fiber Sci. 15(4): 358–375
Morse, P.; Vibration and Sound, 2nd edition, McGraw-Hill, New York, 1948
Radu, A.; Brenndorfer, D. 1976: Zur zerstorungsfreien prufung des solzed durch schwingungsversuche. Holz als Rohund-Werkstoff 34(6): 219–222
Sinclair, A. N.; Farshad, M. 1987: A comparison of three methods for determining elastic constants of wood. Journal of Testing and Evaluation JTEVA 15(2): 77–86
Sobue, N.; Iwasaki, Y. 1981a: Effect of veneer construction on anisotropy of dynamic viscoelasticity of plywood. Mokuzai Gakkaishi 27(6): 457–462
Sobue, N.; Iwasaki, Y. 1981b: Effect of adhesive on dynamic viscoelasticity of laminated lumber of two-ply sawn laminae. Mokuzai Gakkaishi 27(7): 597–601
Sobue, N. 1983: Prediction of dynamic Young's modulus and loss tangent of plywood in bending. Mokuzai Gakkaishi 29(1): 14–19
Sobue, N. 1986a: Measurement of Young's modulus by the transient longitudinal vibration of wooden beams using a FFT spectrum analyser. Mokuzai Gakkaishi 32(9): 744–747
Sobue, N. 1986b: Instantaneous measurement of elastic constants by analysis of the tap tone of wood. Application to flexural vibration of beams. Mokuzai Gakkaishi 32(4): 274–279
Sobue, N. 1988: Simultaneous determination of Young's modulus and shear modulus of structural lumber by complex vibrations of bending and twisting. Mokuzai Gakkaishi 34(8): 652–657
Timoshenko, S., Vibration Problems in Engineering, 3rd edition, D. Van Nostrand, New York, 1955
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The authors wish to thank Pierre Michel and André Perrin for preparing the test specimens and components of the test apparatus for this study
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Haines, D.W., Leban, JM. & Herbé, C. Determination of Young's modulus for spruce, fir and isotropic materials by the resonance flexure method with comparisons to static flexure and other dynamic methods. Wood Sci.Technol. 30, 253–263 (1996). https://doi.org/10.1007/BF00229348
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DOI: https://doi.org/10.1007/BF00229348