Identification of anisotropic vibrational properties of Padauk wood with interlocked grain

Brémaud, Iris; Cabrolier, Pierre; Gril, Joseph; Clair, Bruno; Gérard, Jean; Minato, Kazuya; Thibaut, Bernard

doi:10.1007/s00226-010-0348-0

Cited by 18 publications

(16 citation statements)

References 19 publications

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“…Acoustic measurements based on the free resonant frequencies of the sample are commonly used for measuring the viscoelastic properties of wood but usually for only one direction with samples having a high aspect ratio (Brancheriau and Baillères 2002;Brémaud et al 2010;Obataya et al 2000;Yoshihara 2012). Reducing the aspect ratio of the sample leads to Resonant Ultrasound Spectroscopy (RUS) methods that could offer a good alternative because the determination of the full stiffness tensor could be obtained from only one sample thanks to the measurement of its free resonant frequencies.…”

Section: Introductionmentioning

confidence: 99%

Elastic characterization of wood by Resonant Ultrasound Spectroscopy (RUS): a comprehensive study

et al. 2017

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The main principle of Resonant Ultrasound Spectroscopy (RUS) measurement method is to excite a sample and to deduce its elastic constants from its free mechanical resonant frequencies. The goal of this paper is to propose an applica-tion of RUS in the case of wood cubic samples by: (1) using frequencies and mode shapes (or vibration patterns) of the free resonant modes in an iterative numerical procedure to solve the inverse problem for identifying components of the stiffness tensor of the sample's material, (2) finding the limits and optimizing the robustness of the identification procedure in the case of wood and (3) applying it to a large density range of wood samples. Specific continuous waves have been used as excita-tion signal in order to experimentally determine the free resonant frequencies and mode shapes of the sample in a faster way by means of Scanning Doppler Vibrom-eter measurements. Afterward, the stiffness tensor was derived by solving iteratively an inverse problem. The gain of using the mode shapes in the inverse identification procedure is demonstrated to be particularly necessary for wood, especially for pair-ing each measured frequency with its corresponding theoretically predicted one, as viscoelastic damping causes the resonant peaks to overlap and/or disappear. A sen-sitivity analysis of each elastic constant on the measured resonant frequencies has thus been performed. It shows that, in its current state of development, not all of the

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Section: Introductionmentioning

confidence: 99%

Elastic characterization of wood by Resonant Ultrasound Spectroscopy (RUS): a comprehensive study

et al. 2017

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“…On the other hand, vibrational properties are very sensitive to chemical variations and/or modifications within the cell wall, which can also modulate their anisotropy (Obataya et al 2000). Some extractives naturally present in wood can modify damping by as much as a factor of 2 and can have smaller but anisotropic effects on moduli (Brémaud et al 2010b;Minato et al 2010;Yano et al 1995).…”

Section: Introductionmentioning

confidence: 99%

Anisotropy of wood vibrational properties: dependence on grain angle and review of literature data

2010

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The anisotropy of vibrational properties influences the acoustic behaviour of wooden pieces and their dependence on grain angle (GA). As most pieces of wood include some GA, either for technological reasons or due to grain deviations inside trunks, predicting its repercussions would be useful. This paper aims at evaluating the variability in the anisotropy of wood vibrational properties and analysing resulting trends as a function of orientation. GA dependence is described by a model based on transformation formulas applied to complex compliances, and literature data on anisotropic vibrational properties are reviewed. Ranges of variability, as well as representative sets of viscoelastic anisotropic parameters, are defined for mean hardwoods and softwoods and for contrasted wood types. GAdependence calculations are in close agreement with published experimental results and allow comparing the sensitivity of different woods to GA. Calculated trends in damping coefficient (tand) and in specific modulus of elasticity (E 0 /q) allow reconstructing the general tand-E 0 /q statistical relationships previously reported. Trends for woods with different mechanical parameters merge into a single curve if anisotropic ratios (both elastic and of damping) are correlated between them, and with axial properties, as is indicated by the collected data. On the other hand, varying damping coefficient independently results in parallel curves, which coincide

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“…This theory explains that reaction wood, or wood with high growth stresses which was caused by the angled grain-which includes the wood with wavy grain-will form cells with larger MFA. However, besides theoretical considerations, there is still very little experimental evidence of potential correlations between MFA and grain angle: some was found in a case of interlocked grain (Brémaud et al 2010), but not reproduced in interlocked grain of other species (Cabrolier 2007). (Table 5 and 6), which is higher than the individual effects of MFA or of grain angle on these properties.…”

Section: Discussionmentioning

confidence: 99%

Relationships between anatomical and vibrational properties of wavy sycamore maple

Alkadri¹,

Carlier²,

Wahyudi³

et al. 2018

IAWA Journal

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Sycamore maple (Acer pseudoplatanus L.) is a wood species particularly known for its wavy grain figure and its high-value utilization among luthiers and craftsmen for making musical instruments or furniture. In this study, the anatomical and physical-acoustical characteristics of its wood, taken from different trees with various surface figure, were characterized. Vibrational mechanical measurements were conducted taking into account radial and longitudinal directions and local variations, waviness' parameters were quantified on split blocks, and anatomical properties such as microfibril angle and rays' dimensions were measured using light microscopy. Results provide a complete dataset on the properties of sycamore maple showing a gradient of wavy figure. Through statistical analysis, it can be concluded that there exist significant correlations between the measured parameters, particularly between waviness and microfibril angle, and between these anatomical features and the specific modulus of elasticity and damping by internal friction of the wood in longitudinal direction. Anisotropy was found to be very low but was not satisfactorily explained by the studied anatomical features. Prospects for future studies on wavy figure are introduced.

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Identification of anisotropic vibrational properties of Padauk wood with interlocked grain

Cited by 18 publications

References 19 publications

Elastic characterization of wood by Resonant Ultrasound Spectroscopy (RUS): a comprehensive study

Elastic characterization of wood by Resonant Ultrasound Spectroscopy (RUS): a comprehensive study

Anisotropy of wood vibrational properties: dependence on grain angle and review of literature data

Relationships between anatomical and vibrational properties of wavy sycamore maple

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