Wood as a renewable engineering material has widely been used for structural purpose for decades, but its static bending modulus of elasticity (E b) has not been seriously researched in large-scale relative humidity fluctuant environment. This paper presents an experimental and numerical study for the assessment of E b of Pinus yunnanensis as a function of moisture content and its distribution in high relative humidity environment. For this, a moisture transfer model based on a multi-phase-type approach and a classical theory of laminated plate was used. The experimental results indicated that the predicted E b had good agreement with measured data making it possible for researchers, designers, and industry in the field of wood mechanics and products to directly obtain the wood E b by way of calculation. Furthermore, it was also found that there was a decrease in E b in the short term when the environment relative humidity increased substantially. This phenomenon reminds designers and industry in the field of wood mechanics and products that using so-called E b with equilibrium moisture content as the actual mechanical value of structural-use wood may bear a potential risk.
Wood Science and Technology – Springer Journals
Published: May 16, 2017
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