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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