Determining shear modulus of thin wood composite materials using a cantilever beam vibration method

Published Date
15 September 2016, Vol.121:285–289, doi:10.1016/j.conbuildmat.2016.06.007

Author 

Cheng Guan ^a

Houjiang Zhang ^a,,

John F. Hunt ^b

Haicheng Yan ^a

aSchool of Technology, Beijing Forestry University, Beijing 100083, China

bUSDA Forest Products Laboratory, 1 Gifford Pinchot Drive, WI 53726-2398, USA

Received 30 January 2016. Revised 6 May 2016. Accepted 1 June 2016. Available online 6 June 2016.

Highlights

• A cantilever beam vibration method.
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  In-plane shear modulus.
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  Medium density fiberboard (MDF), particleboard (PB) and wood fiber plastic (WFP).
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  There exists a significant linear correlation between in-plane shear modulus and bending modulus of elasticity.

Abstract

Shear modulus (G) of thin wood composite materials is one of several important indicators that characterizes mechanical properties. However, there is not an easy method to obtain this value. This study presents the use of a newly developed cantilever beam free vibration test apparatus to detect in-plane G of thin wood composite materials by measuring the first order free vibration cantilever specimens and its logarithmic decrement of vibration. Six sets of commercially purchased thin wood composite materials having three different fiber types were tested. A significant linear correlation was found between in-plane G and bending modulus of elasticity (MOE) from cantilever-beam free vibration test and MOE was shown to be approximately two times of in-plane G. This was in full agreement with previous findings by other researchers. The study demonstrated that the cantilever beam free vibration method could be widely used to obtain in-plane G easily for thin wood composite materials.

Keywords

Thin wood composite materials

Cantilever beam free vibration

In-plane shear modulus

Modulus of elasticity

Logarithmic decrement

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  Corresponding author.
  
  

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