Radial variations of vibrational properties of three tropical woods |
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| Authors: | Tian Zhang Shu-Lin Bai Sandrine Bardet Tancrède Alméras Bernard Thibaut Jacques Beauchêne |
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| Institution: | 1.Department of Advanced Materials and Nanotechnology, College of Engineering,Peking University,Beijing,China;2.Laboratoire de Mécanique et Génie Civil (LMGC),Montpellier,France;3.CIRAD, UMR Ecofog,Kourou Cedex, Guyane Fran?aise,France |
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| Abstract: | The radial trends of vibrational properties, represented by the specific dynamic modulus (E′/ρ) and damping coefficient (tan δ), were investigated for three tropical rainforest hardwood species (Simarouba amara, Carapa procera, and Symphonia globulifera) using free-free flexural vibration tests. The microfibril angle (MFA) was estimated using X-ray diffraction. Consistent
patterns of radial variations were observed for all studied properties. E′/ρ was found to decrease from pith to bark, which was strongly related to the increasing pith-bark trend of MFA. The variation
of tan δ along the radius could be partly explained by MFA and partly by the gradient of extractives due to heartwood formation. The
coupling effect of MFA and extractives could be separated through analysis of the log(tan δ) versus log(E′/ρ) diagram. For the species studied, the extractive content putatively associated with heartwood formation generally tends
to decrease the wood damping coefficient. However, this weakening effect of extractives was not observed for the inner part
of the heartwood, suggesting that the mechanical action of extractives was reduced during their chemical ageing. |
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