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Transverse compression behavior of Douglas-fir (Pseudotsuga menziesii) in saturated steam environment

Querdruckverhalten von Douglasie (Pseudotsuga menziesii) unter Sattdampfbedingungen

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Abstract

The transverse compression behavior of Douglas-fir wood (Pseudotsuga menziesii) at high temperature (170 °C) and saturated steam conditions was studied and compared with previously reported compression behavior of hybrid poplar (Populus deltoides × Populus trichocarpa). The effect of the compression on the stress–strain response, non-linear strain function, and relative density change was examined by a modified Hooke’s law based on the load-compression behavior of flexible foams. Transverse compressive loading followed a typical stress–strain curve of wood. The compressive modulus of Douglas-fir was higher than hybrid poplar. The yield stress of Douglas-fir specimens was higher than yield stress of hybrid poplar specimens, while densification stress of both wood species was the same. The comparison of the non-linear strain function of Douglas-fir and hybrid poplar specimens revealed significant differences. The observed differences are assumed to be due to different cellular structure and chemical composition of softwoods versus hardwoods.

Zusammenfassung

In dieser Studie wurde das Querdruckverhalten von Douglasienholz (Pseudotsuga menziesii) bei hoher Temperatur (170 °C) und unter Sattdampfbedingungen untersucht und mit dem früher untersuchtem Querdruckverhalten der Hybridpappel (Populus deltoides × Populus trichocarpa) verglichen. Der Einfluss des Drucks auf das Spannungs-Stauchungs-Verhalten, die nichtlineare Dehnungsfunktion und die relative Dichteänderung wurde mittels eines modifizierten Hookeschen Gesetzes basierend auf dem Verformungsverhalten von Weichschaumstoffen untersucht. Die Querdruckbelastung folgte dem typischen Verlauf eines Spannungs-Stauchungs-Diagramms von Holz. Der Druckmodul von Douglasie war höher als der von Hybridpappel. Die Fließgrenze von Douglasienprüfkörpern war höher als die von Hybridpappelprüfkörpern, wohingegen die Spannung an der Verdichtungsgrenze bei beiden Holzarten gleich war. Die nichtlineare Dehnungsfunktion von Douglasien- und Hybridpappelprüfkörpern unterschied sich signifikant. Es wird angenommen, dass die Gründe für diese Unterschiede in der unterschiedlichen Zellstruktur und der chemischen Zusammensetzung von Nadelholz und Laubholz liegen.

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Acknowledgments

The project was supported by the National Research Initiative of the USDA Cooperative State Research, Education and Extension Service, grant number 2006-35504-17444 and USDA Wood Utilization Research Center Special Grant number 2008-34158-19302.

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Authors and Affiliations

  1. Andrej Marušič Institute, University of Primorska, Muzejski trg 2, 6000, Koper, Slovenia

    Andreja Kutnar

  2. ILTRA d.o.o., Celovska cesta 268, 1000, Ljubljana, Slovenia

    Andreja Kutnar

  3. Department of Wood Science and Engineering, Oregon State University, 119 Richardson Hall, Corvallis, OR, USA

    Frederick A. Kamke

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  1. Andreja Kutnar
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  2. Frederick A. Kamke
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Correspondence to Andreja Kutnar.

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Kutnar, A., Kamke, F.A. Transverse compression behavior of Douglas-fir (Pseudotsuga menziesii) in saturated steam environment. Eur. J. Wood Prod. 71, 443–449 (2013). https://doi.org/10.1007/s00107-013-0698-z

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  • DOI: https://doi.org/10.1007/s00107-013-0698-z

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