Measurement of dynamic modulus of elasticity and damping ratio of wood-based composites using the cantilever beam vibration technique

Published Date
March 2012, Vol.28(1):831–834, doi:10.1016/j.conbuildmat.2011.09.001

Technical Note

Author 

Zheng Wang ^a,,

Ling Li ^a,b,

Meng Gong ^b,

aCollege of Wood Science and Technology, Nanjing Forestry University, Nanjing, Jiangsu 210037, China

bFaculty of Forestry and Environmental Management, University of New Brunswick, Fredericton, New Brunswick, Canada E3B 5A3

Received 12 November 2010. Revised 20 August 2011. Accepted 1 September 2011. Available online 20 November 2011. 

Abstract

The non-destructive testing technique has been widely used to determine the dynamic mechanical properties of wood and wood-based composites, such as dynamic modulus of elasticity (E_d) and damping ratio (ζ). The cantilever beam vibration method is a cost-efficient and time-saving technique that was employed in this study to measure E_d and ζ values of three commercial wood-based composites, i.e. plywood (PLW), high density fiberboard (HDF), and oriented strand board (OSB). The E_d and ζ values were determined in light of the spectral analysis on the first natural frequency and the first and fifth amplitudes of vibration in the vertical direction, which was triggered by tapping one end of a specimen free of the support. To verify the values, the static bending tests were conducted. It was found that the E_d values of three kinds of wood composites tested were slightly higher than the static modulus of elasticity (E_s). There existed a good linear agreement between E_d and E_s. The ζ value of PLW was the largest among three composites, and the OSB showed the lowest ζ.

Highlights

► A cantilever beam vibration method. ► Dynamic modulus of elasticity (MOE) and damping ratio. ► Plywood (PLW), high density fiberboard (HDF) and oriented strand board (OSB). ► The dynamic MOE of OSB was about 130% and 137% larger than PLW and HDF. ► The damping ratio of PLW was about 9.5% and 77% larger than those of HDF and OSB.

Keywords

M. Material property databases

N. Non-destructive testing

C. Composites

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On-line non-destructive evaluation and control of wood-based panels by vibration analysis

Published Date
20 November 2003, Vol.268(2):403–412, doi:10.1016/S0022-460X(03)00342-0

Letter to the Editor

Author 

F. Bos ^a,

S.Bos Casagrande ^b

aLaboratoire de Réologie du Bois de Bordeaux, Domaine de l’hermitage, 69 route d’Arcachon, 33612 Cestas Gazinet, France

bXYLOMECA, Le Fouquet, 33490 Sainte-Foy La Longue, France

Received 4 November 2002. Accepted 18 February 2003. Available online 13 August 2003. 

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Waves in wood: free vibrations of a wooden pole

Published Date
May 2001, Vol.49(5):1155–1178, doi:10.1016/S0022-5096(00)00068-5

Author 

P.A. Martin ^a,,

J.R. Berger ^b

aDepartment of Mathematical and Computer Sciences, Colorado School of Mines, Golden, CO 80401-1887, USA

bDivision of Engineering, Colorado School of Mines, Golden, CO 80401-1887, USA

Received 26 May 2000. Accepted 1 July 2000. Available online 27 April 2001. 

Abstract

Elastic waves in materials with cylindrical orthotropy are considered, this being a plausible model for a wooden pole. For time-harmonic motions, the problem is reduced to some coupled ordinary differential equations. Previously, these have been solved using the method of Frobenius (power-series expansions). Here, Neumann series (expansions in Bessel functions of various orders) are used, motivated by the known classical solutions for homogeneous isotropic solids. This is shown to give an effective and natural method for wave propagation in cylindrically orthotropic materials. As an example, the frequencies of free vibration of a wooden pole are computed. The problem itself arose from a study of ultrasonic devices as used in the detection of rotten regions inside wooden telegraph (utility) poles and trees; some background to these applications is given.

Keywords

Wood

Cylindrical orthotropy

Wave propagation

Neumann series

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Comments on “On-line non-destructive evaluation and control of wood-based panels by vibration analysis”

Published Date
23 February 2005, Vol.280(3):1154–1156, doi:10.1016/j.jsv.2004.01.045

Discussion

Author 

R.E. Rossi

D.V. Bambill

P.A.A. Laura ^,

Department of Engineering, Institute of Applied Mechanics, Universidad Nacional del Sur, Horneros 160, Av. Alem 1253, 8000-Bahía Blanca, Argentina

Received 10 December 2003. Accepted 28 January 2004. Available online 8 October 2004. 

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Transmission of sonic booms into a rectangular room with a plaster–wood wall using a modal – Interaction model

Published Date
13 November 2009, Vol.327(3):529–556, doi:10.1016/j.jsv.2009.07.010

Author 

Marcel C. Remillieux 

Ricardo A. Burdisso ^,

Georg Reichard 

Mechanical Engineering Department, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA

Received 11 February 2009. Revised 13 July 2009. Accepted 14 July 2009. Available online 7 August 2009. Handling Editor: S. Bolton

Abstract

As a first step in the development of a model for predicting the noise transmission of sonic booms inside buildings, a numerical solution for the transmission of a shock wave with an arbitrary time history into a rectangular room with a plaster–wood wall is investigated. The dynamics of this fluid–structure system, including their interaction, is computed in the time domain using a modal-interaction method. The formulation of the problem, illustrative numerical results, and a parametric study are presented. The experimental effort dedicated to validating the numerical formulation is also presented. A speaker generating sonic booms with various durations is used to structurally load a plaster–wood wall mounted in the opening of a cinderblock room. The measured wall vibration and pressures at several locations inside the room are compared to the numerical predictions, showing a fairly good agreement overall. Results from this study can potentially be used by aircraft designers to minimize the noise impact in residential houses.

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