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Prediction of the mechanical properties of lumber by stress-wave velocity and Pilodyn penetration of 36-year-old Japanese larch trees

Prognose der mechanischen Eigenschaften von Schnittholz aus 36 Jahre alten japanischen Lärchen mittels des Stress-Wave- und des Pilodynverfahrens

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Abstract

The objective of this study was to obtain basic knowledge for the prediction of the mechanical properties of Japanese larch lumber (Larix kaempferi) on the basis of tree properties, such as the stress-wave velocity (SWV) and Pilodyn penetration value (Py). The values of the correlation coefficient between the SWV of a standing tree and the dynamic Young’s modulus (DMOE) of logs, which were obtained at various heights, gradually decreased with an increase in the log sampling height, indicating that the SWV of a tree is affected by wood properties at the measuring position. A significant correlation between the SWV of trees and the average modulus of elasticity (MOE) of lumber was found (r =0.834). A significant negative correlation between the Py of a tree and the average modulus of rupture (MOR) of lumber was also found (r=-0.859). A high coefficient of determination for an obtained regression curve was found when both the SWV and Py of a tree were used for evaluating the average MOE or MOR of lumber. These results indicate that the average MOE and MOR of lumber can be predicted by using the SWV and Py of the Japanese larch tree.

Zusammenfassung

Ziel dieser Studie war es, Informationen zur Prognose der mechanischen Eigenschaften von japanischem Lärchenschnittholz (Larix kaempferi) anhand der Ausbreitungsgeschwindigkeit von Spannungswellen (SWV) und der Pilodyn-Eindringtiefe (Py) am stehenden Baum zu gewinnen. Die Korrelationskoeffizienten zwischen der SWV am stehenden Baum und dem dynamischen Elastizitätsmodul (DMOE) von Stammabschnitten nahmen mit zunehmender Entnahmehöhe der Stammabschnitte ab. Daraus geht hervor, dass die am Baum bestimmte SWV von den Holzeigenschaften an der Messstelle beeinflusst wird. Es ergab sich eine signifikante Korrelation zwischen der am Baum bestimmten SWV und dem mittleren Elastizitätsmodul (MOE) von Schnittholz (r=0,834), sowie eine signifikante negative Korrelation zwischen der Pilodyn-Eindringtiefe (Py) am Baum und der mittleren Biegefestigkeit (MOR) des Schnittholzes (r=-0,859). Eine Regressionsrechnung mit den beiden am Baum bestimmten Größen SWV und Py zur Bestimmung des mittleren Elastizitätsmoduls und der Biegefestigkeit von Schnittholz ergab in beiden Fällen ein hohes Bestimmtheitsmaß. Diese Ergebnisse zeigen, dass der mittlere Elastizitätsmodul und die Biegefestigkeit von Schnittholz aus japanischen Lärchen mittels des Stress-Wave- und des Pilodynverfahrens vorhergesagt werden können.

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Authors and Affiliations

  1. Faculty of Agriculture, Utsunomiya University, 321-8505, Utsunomiya, Japan

    Futoshi Ishiguri, Ryusei Matsui, Kazuya Iizuka, Shinso Yokota & Nobuo Yoshizawa

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  1. Futoshi Ishiguri
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  2. Ryusei Matsui
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  3. Kazuya Iizuka
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  4. Shinso Yokota
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  5. Nobuo Yoshizawa
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Correspondence to Futoshi Ishiguri.

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Ishiguri, F., Matsui, R., Iizuka, K. et al. Prediction of the mechanical properties of lumber by stress-wave velocity and Pilodyn penetration of 36-year-old Japanese larch trees . Holz Roh Werkst 66, 275–280 (2008). https://doi.org/10.1007/s00107-008-0251-7

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  • DOI: https://doi.org/10.1007/s00107-008-0251-7

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