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1 Department of Advanced Materials and Nanotechnology 2 LMGC - Laboratoire de Mécanique et Génie Civil 3 MAB - Mécanique de l-Arbre et du Bois LMGC - Laboratoire de Mécanique et Génie Civil 4 ECOFOG - Ecologie des forêts de Guyane

Abstract : Radial trends of vibrational properties, including the specific dynamic modulus E-r and damping coefficient tand, were investigated for 3 tropical rainforest hardwood species, Simarouba amara, Carapa procera and Symphonia globulifera by free-free flexural vibration test. The microfibril angle MFA was estimated through X-Ray diffraction. Consistent patterns of radial variations were observed for all studied properties. E-r was found to decrease from pith to bark, which is strongly related to the increasing pith-bark trend of MFA. The variation of tand along the radius can 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 the analysis of logtand - logE-r diagram. For the studied species, the extractive content putatively associated to heartwood formation generally tends to decrease the wood damping coefficient. However, this weakening effect of extractives was not observed for inner part of the heartwood, suggesting the mechanical action of extractives was reduced during their chemical ageing.

Keywords : tropical woods vibrational properties dynamic modulus damping coefficient microfibril angle extractives wood ageing





Autor: Tian Zhang - Shu-Lin Bai - Sandrine Bardet - Tancrède Alméras - Bernard Thibaut - Jacques Beauchêne -

Fuente: https://hal.archives-ouvertes.fr/



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