Évaluation de deux méthodes acoustiques de détermination du module d'élasticité de bois de mélèze hybride jeune (Larix × eurolepis Henry) - comparaison avec une méthode normalisée en flexion statique

Marchal, Michèle; Jacques, Dominique

doi:10.1051/forest:19990407

Cited by 11 publications

(12 citation statements)

References 5 publications

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“…The Sylvatest device allows for the measurement of ultrasound wave propagation time (emission frequency 50 kHz) in the longitudinal direction of the specimen [27].…”

Section: Ultrasound Methods By Means Of the Sylvatestmentioning

confidence: 99%

“…The Grindo-Sonic measures Young's modulus by analysing the natural period of the transient vibration which results from a mechanical disturbance of the object tested [27].…”

Section: Resonance Frequency Methods By Means Of the Grindo-sonicmentioning

confidence: 99%

“…It is used to estimate the modulus of elasticity according to the following equation: MOE US = V 2 US ρ 10 -6 [4,5,13,31] where V US is the ultrasound propagation speed in the longitudinal direction, in metres per second (m s -1 ), ρ is the wood density [27], in kilograms per cubic metre (kg m -3 ) and MOE US , the modulus of elasticity in longitudinal direction, in megapascals (MPa).…”

Section: Ultrasound Methods By Means Of the Sylvatestmentioning

confidence: 99%

“…The method measures modulus of elasticity in static bending (MOE 4PT ) as described in the French standard NF B 51-016 [1,27], by means of an "Instron 5582" engine. It is used as the control method.…”

Section: Control Methodsmentioning

confidence: 99%

“…The reading R corresponds to the duration of two specific periods and is expressed in microseconds. The specific frequency (F r in Hz) is given by: [24,27].…”

Section: Resonance Frequency Methods By Means Of the Grindo-sonicmentioning

confidence: 99%

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Relative efficiency of alternative methods to evaluate wood stiffness in the frame of hybrid larch (Larix�נeurolepis Henry) clonal selection

2004

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-This study compares the efficiency of 3 indirect techniques that evaluate Young's modulus all along the sawing leading to the production of normalised specimens of hybrid larch trees from a clonal test. Ultrasonic speed is demonstrated as an interesting method for clone classification regarding Young's modulus in a clonal selection programme, whatever the sawing stage. However, the quality of results is reduced with standing tree measurements. The use of both the Pilodyn and resonance frequency measures is confirmed as a possibility.

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“…The Sylvatest device allows for the measurement of ultrasound wave propagation time (emission frequency 50 kHz) in the longitudinal direction of the specimen [27].…”

Section: Ultrasound Methods By Means Of the Sylvatestmentioning

confidence: 99%

“…The Grindo-Sonic measures Young's modulus by analysing the natural period of the transient vibration which results from a mechanical disturbance of the object tested [27].…”

Section: Resonance Frequency Methods By Means Of the Grindo-sonicmentioning

confidence: 99%

Section: Ultrasound Methods By Means Of the Sylvatestmentioning

confidence: 99%

Section: Control Methodsmentioning

confidence: 99%

“…The reading R corresponds to the duration of two specific periods and is expressed in microseconds. The specific frequency (F r in Hz) is given by: [24,27].…”

Section: Resonance Frequency Methods By Means Of the Grindo-sonicmentioning

confidence: 99%

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Relative efficiency of alternative methods to evaluate wood stiffness in the frame of hybrid larch (Larix�נeurolepis Henry) clonal selection

2004

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Methods for measuring stiffness of young trees

Lindström¹,

Harris²,

Nakada³

2002

Holz als Roh- und Werkstoff

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There is a need to determine stiffness at an early age, to help capture genetic breeding opportunities for better structural lumber. The current study investigates the possibility of selecting Pinus radiata clones with high modulus of elasticity (MOE). Various ways of measuring MOE are examined: traditional static bending, axial compression of bolts, existing sonic methods, as well as a tool specifically configured for resonance on short bolts. Wood characteristics and microfibril angle are measured on discs taken from each tree. Results show a good correlation between acoustic and static measurements of modulus of elasticity. Moreover, the selected seven radiata clones differ in stiffness by a factor of two, and much of this variation seems to relate to differences in microfibril angle. The results validate the assumption that there is potential to improve wood stiffness of radiata pine genetically. This work does not offer definitive solutions but explores a number of approaches that could be utilised as a selection tool in tree breeding for better product performance of radiata lumber. Here, development of methods based on acoustics is shown to assist in the necessary mass screening of clones for stiffness properties. Methoden zum Messen der Steifigkeit von jungen BäumenFür die genetische Züchtung besteht ein Bedarf, schon zu einem frühen Zeitpunkt die Steifigkeit der Bäume zu bestimmen, um höherwertigeres Schnittholz zu erzielen. Die gegenwärtige Untersuchung prüft die Möglichkeit Klone von Pinus radiata mit hohen MOE-Werten zu selektieren. Verschiedene Methoden zur MOE-Messung werden untersucht: konventionelle statische Biegetests, axiale Kompression von Stäben, vorhandene (Ultra)-Schallmethoden, sowie ein spezielles Gerät zum Messen der Resonanz von kurzen Stäben. Holzeigenschaften und Fibrillenwinkel wurden an Scheiben gemessen, die von jedem Baum entnommen wurden. Die Ergebnisse zeigen eine gute Korrelation zwischen akustischen und statischen Messungen des MOE. Die sieben ausgewählten Klone unterschieden sich in ihrer Steifigkeit um den Faktor 2, wobei ein Großteil dieser Variationen mit Unterschieden im Mikrofibrillenwinkel zusammenhängt. Die Ergebnisse bestätigen die Vermutung, daß ein Potential zum Verbessern der Holzfestigkeit durch genetische Methoden bei Pinus radiata vorhanden ist. Diese Arbeit bietet keine definitiven Lösungen. Sie untersucht eine Anzahl von Ansätzen zur Selektion bei der Züchtung im Hinblick auf bessere Schnittholzprodukte. Die entwicklung von akustischen Methoden erwies sich als hilfreich beim notwendigen Massen-Screening der Festigkeitseigenschaften der Klone.

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Cell wall structure and wood properties determined by acoustics?a selective review

Huang

Lindström

Nakada³

et al. 2003

Holz als Roh- und Werkstoff

105

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Évaluation de deux méthodes acoustiques de détermination du module d'élasticité de bois de mélèze hybride jeune (Larix × eurolepis Henry) - comparaison avec une méthode normalisée en flexion statique

Cited by 11 publications

References 5 publications

Relative efficiency of alternative methods to evaluate wood stiffness in the frame of hybrid larch (Larix�נeurolepis Henry) clonal selection

Relative efficiency of alternative methods to evaluate wood stiffness in the frame of hybrid larch (Larix�נeurolepis Henry) clonal selection

Methods for measuring stiffness of young trees

Cell wall structure and wood properties determined by acoustics?a selective review

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