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    Author(s): Jiali Jiang; Jianxiong Lu; Zhiyong Cai
    Date: 2012
    Source: BioResources Volume 7, Number 3, 2012; pp. 3585-3596.
    Publication Series: Scientific Journal (JRNL)
    Station: Forest Products Laboratory
    PDF: Download Publication  (1.35 MB)


    The vibrational properties of Chinese fir (Cunninghamia lanceolata) wood were investigated in this study as a function of changes in moisture content (MC) and grain direction. The dynamic modulus of elasticity (DMOE) and logarithmic decrement σ were examined using a cantilever beam vibration testing apparatus. It was observed that DMOE and 6 of wood vaned widely during moisture adsorption and desorption. The DMOE of wood conditioned by the adsorption process showed significant increases during the later stages of conditioning when the MC scarcely changed. However, with the desorption process, the DMOE did not increase as much during the later stages of conditioning, though they increased during the early stages of conditioning when the MC greatly decreased. These results suggest that wood in an unstable state, caused via the existing state of moisture, shows different vibrational behaviors. Furthermore, the parallel to grain direction showed much higher DMOE and lower σ when compared to the perpendicular to grain direction. The variation of vibrational properties between parallel and perpendicular to grain direction under constant MC and during moisture adsorption process could be attributed due to the microscopic, macroscopic molecular, as well as chemical constituents of wood.

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    Jiang, Jiali; Lu, Jianxiong; Cai, Zhiyong. 2014. The vibrational properties of Chinese fir wood during moisture sorption process. BioResources Volume 7, Number 3, 2012; pp. 3585-3596.


    changing process of moisture, Dynamic modulus of elasticity, Logarithmic decrement, Anisotropic characteristics

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