|
|||||
|
|
Identification of anisotropic vibrational properties of Padauk wood with interlocked grain |
|
| Authors: | Iris Brémaud Pierre Cabrolier Joseph Gril Bruno Clair Jean Gérard Kazuya Minato Bernard Thibaut |
| Institution: | 1. Laboratory of Forest Resource Circulating Circles, Graduate School of Life and Environmental Sciences, Kyoto Prefectural University, Kyoto, 606-8522, Japan 2. Laboratoire de Mécanique et Génie Civil, CNRS - Université Montpellier 2, Place E. Bataillon, cc 048, 34095, Montpellier cedex 5, France 3. Tropical and Mediterranean Forest Products, CIRAD, TA B40/16 BP 5035, 34398, Montpellier cedex 5, France 4. UMR Ecologie des Forêts de Guyane, CNRS, BP 316, 97379, Kourou cedex, French Guyana |
| Abstract: | Grain deviations and high extractives content are common features of many tropical woods. This study aimed at clarifying their respective impact on vibrational properties, referring to African Padauk (Pterocarpus soyauxii Taub.), a species selected for its interlocked grain, high extractives content and uses in xylophones. Specimens were cut parallel to the trunk axis (L), and local variations in grain angle (GA), microfibril angle (MFA), specific Young’s modulus (E′ L /ρ, where ρ stands for the density) and damping coefficient (tanδL) were measured. GA dependence was analysed by a mechanical model which allowed to identify the specific Young’s modulus (E′3/ρ) and shear modulus (G′/ρ) along the grain (3) as well as their corresponding damping coefficients (tanδ3, tanδG). This analysis was done for native and then for extracted wood. Interlocked grain resulted in 0–25° GA and in variations of a factor 2 in E′L/ρ and tanδL. Along the grain, Padauk wood was characterized, when compared to typical hardwoods, by a somewhat lower E′3/ρ and elastic anisotropy (E′/G′), due to a wide microfibril angle plus a small weight effect of extracts, and a very low tanδ3 and moderate damping anisotropy (tanδG/tanδ3). Extraction affected mechanical parameters in the order: tanδ3 ≈ tanδG > G′/ρ > > E′3/ρ. That is, extractives’ effects were nearly isotropic on damping but clearly anisotropic on storage moduli. |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ | |