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Dynamic MOE of 55 species using small wood beams

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Abstract

Nondestructive impact-induced resonance vibrations and spectral analysis were used to determine the dynamic modulus of elasticity (MOE) of specimens from 45 hardwood and 10 softwood species. Relationships were obtained between air-dry specimens measuring 20×20×300 mm and small wood beams measuring 20×2×150 mm (nominal) cut from them. Dynamic longitudinal elastic modulus (EL) and wave velocity (VL) in the fiber direction were determined from the larger specimens. These were compared with the dynamic flexural elastic modulus (ECB-cantilever mode) and the dynamic longitudinal elastic modulus (ELB) with the corresponding wave velocity (VBL) measured from the small beams. ECB and ELB were highly related to EL. VLB was similarly related to VL. The methods developed for small wood beams allow rapid evaluation of MOE from the outer wood of standing trees or they can be used for studies involving detailed localized evaluation of elastic wood properties.

Zusammenfassung

Zur Bestimmung des dynamischen MOE wurde die zerstörungsfreie Schwingungs- und Spektralanalyse an 45 Laubholz- und 10 Nadelholzarten verwendet. Dabei ergaben sich Beziehungen zwischen luftgetrockneten Proben mit Abmessungen 20×30×300 mm und kleinen Holzstäben (20×2×150 mm), die daraus entnommen waren. Der dynamische longitudinale E-Modul (EL) sowie die Schallgeschwindigkeit (VL) in Faserrichtung wurden an den größeren Proben bestimmt. Diese Werte wurden verglichen mit dem dynamischen Biegemodul (ECB-Kantilever Modus) und mit dem dynamischen E-Modul (ELB) zusammen mit der entsprechenden Schallgeschwindigkeit VLB, die an kleinen Proben gemessen wurden. ECB und ELB erwiesen sich als streng korreliert mit EL. VLB zeigte einen ähnlichen Zusammenhang mit VL. Die Methoden, die für kleine Holzstäbe entwickelt wurden, erlauben eine schnelle Schätzung des MOE des äußeren Holzes stehender Bäume. Die Methode kann auch benutzt werden, um detaillierte lokale Werte der elastischen Holzeigenschaften zu gewinnen.

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Acknowledgements

The author wishes to thank Ms Jenny Carr for performing some dynamic measurements, Dr Silvia Pongracic and George Freischmidt for helpful suggestions.

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  1. CSIRO Forestry and Forest Products, Private Bag 10 South Clayton, 3169, Melbourne, Victoria, Australia

    J. Ilic

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  1. J. Ilic
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Ilic, J. Dynamic MOE of 55 species using small wood beams. Holz Roh Werkst 61, 167–172 (2003). https://doi.org/10.1007/s00107-003-0367-8

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  • DOI: https://doi.org/10.1007/s00107-003-0367-8

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