Stiffness moduli of various softwood and hardwood species determined with ultrasound

Keunecke, Daniel; Merz, Tobias M.; Sonderegger, Walter; Schnider, Thomas; Niemz, Peter

doi:10.1080/17480272.2010.534555

Cited by 8 publications

(3 citation statements)

References 3 publications

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“…In general, the results indicated clear differences between the SV along the principal directions (SVL > SVR> SVT). The ratios found in this study were somewhat smaller than those reported by Bucur (2006), Keunecke et al (2011), and Baradit and Niemz (2012). There was a good negative correlation between MC and SV, and the correlations are higher in the perpendicular directions.…”

Section: Resultscontrasting

confidence: 56%

“…According to Bucur (2006), the ultrasonic values of Young's modulus, EL, are slightly higher than the corresponding static measured modulus under compression. It is known that dynamically determined elastic properties are increased by 10% to 20% (or even more, depending on the frequency of ultrasonic waves) compared with statistically calculated values (Keunecke et al 2011).…”

Section: Resultsmentioning

confidence: 99%

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Prediction of Compression Properties in Three Orthotropic Directions for Some Important Turkish Wood Species Using Ultrasound

Güntekin¹,

Aydın²,

Niemz³

2015

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Compression properties in three orthotropic directions for some important Turkish wood species, including Calabrian pine (Pinus brutia Ten.), Taurus cedar (Cedrus libani), Oriental beech (Fagus orientalis), and sessile oak (Quercus petraea), were studied using non-destructive and destructive techniques. The materials used in the study consisted of 720 small clear specimens of nominal dimensions of 20 x 20 x 60 mm. The influence of equilibrium moisture content (EMC) was studied over four batches of 15 specimens each, conditioned for six to eight weeks before testing at a temperature of 20 ± 2 °C and at four different relative humidity conditions (50%, 65%, 85%, and 95%). Time of flight values were measured with a commercial ultrasonic tester. Using the time results from the ultrasound device, the wave velocities (length/time) and Edyn values were calculated. Samples were also tested in uniaxial compression to determine the Young's modulus and compression strength values in three orthotropic directions. The Edyn correlated well with the Young's modulus and compression strength of the specimens; coefficients of determination ranged between 0.75 and 0.96. Moisture content seems to have more influence than density on sound velocities. Results showed that there is a weak and mostly negative correlation between the density of the specimens and the sound velocity values.

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Section: Resultscontrasting

confidence: 56%

Section: Resultsmentioning

confidence: 99%

Prediction of Compression Properties in Three Orthotropic Directions for Some Important Turkish Wood Species Using Ultrasound

Güntekin¹,

Aydın²,

Niemz³

2015

BioResources

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“…The second (or even third) line corresponds to literature data (Arnould et al 2010;Bader et al 2012Bader et al , 2017Bardet and Gril 2002;Brabec et al 2017;Brémaud et al 2013;Bucur and Archer 1984;Bucur 2006;Borst et al 2012;El Mouridi et al 2011;Fang et al 2008;Garab et al 2010;Gindl 2002;Guitard and El Amri 1987;Hering et al 2012;Keunecke et al 2007Keunecke et al , 2008Keunecke et al , 2011Ozyhar et al 2013a, b;Ruelle et al 2007Ruelle et al , 2011Scholz et al 2007;Sliker 1988Sliker , 1989Timell 1986;Forest Products Laboratory 2010;Zhang and Sliker 1991) where a stands for only one reference value available, b for only one reference value available in the green state and -for no data available. Measurements were taken at ≈ 20 • C and 40%RH of the measured modes m to the elastic coefficients X i (e.g., X i = E T or G TL or RT ), as defined in step 5 of the identification procedure a global fit is performed on these five elastic constants.…”

Section: Results On Beechmentioning

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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Zerstörungsfreie/‐arme Prüfmethoden für Bestandsuntersuchungen im Holzbau: Wellenbasierte Methoden – Stand der Technik und Untersuchungsergebnisse

Perria¹,

Böhler²,

Sieder³

2022

Bauphysik Kalender 2022

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Stiffness moduli of various softwood and hardwood species determined with ultrasound

Cited by 8 publications

References 3 publications

Prediction of Compression Properties in Three Orthotropic Directions for Some Important Turkish Wood Species Using Ultrasound

Prediction of Compression Properties in Three Orthotropic Directions for Some Important Turkish Wood Species Using Ultrasound

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

Zerstörungsfreie/‐arme Prüfmethoden für Bestandsuntersuchungen im Holzbau: Wellenbasierte Methoden – Stand der Technik und Untersuchungsergebnisse

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