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Journal of Wood Science

Official Journal of the Japan Wood Research Society

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Mechanical characterization of juvenile European aspen (Populus tremula) and hybrid aspen (Populus tremula × Populus tremuloides) using full-field strain measurements

Journal of Wood Science volume 54, pages 349–355 (2008)Cite this article

Abstract

Functional analysis of genes and proteins involved in wood formation and fiber properties often involves phenotyping saplings of transgenic trees. The objective of the present study was to develop a tensile test method for small green samples from saplings, and to compare mechanical properties of juvenile European aspen (Populus tremula) and hybrid aspen (Populus tremula × tremuloides). Small microtomed sections were manufactured and successfully tested in tension parallel to fiber orientation. Strain was determined by digital speckle photography. Results showed significantly lower values for juvenile hybrid aspen in both Young’s modulus and tensile strength parallel to the grain. Average Young’s moduli spanned the ranges of 5.9–6.6 and 4.8–6.0 GPa for European aspen and hybrid aspen, respectively. Tensile strength was in the range of 45–49 MPa for European aspen and 32–45 MPa for hybrid aspen. The average density (oven-dry) was 284 kg/m3 for European aspen and 221 kg/m3 for hybrid aspen. Differences in mechanical properties correlated with differences in density.

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Authors and Affiliations

  1. Department of Fiber and Polymer Technology, Royal Institute of Technology, Teknikringen 56, SE-100 44, Stockholm, Sweden

    Ingela Bjurhager & Lars A. Berglund

  2. Department of Wood Science, Swedish University of Agricultural Sciences (SLU), SE-750 07, Uppsala, Sweden

    Stig L. Bardage

  3. Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences (SLU), SE-901 83, Umeå, Sweden

    Björn Sundberg

Authors
  1. Ingela Bjurhager
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  2. Lars A. Berglund
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  3. Stig L. Bardage
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  4. Björn Sundberg
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Additional information

Part of this article was presented at the 3rd International Symposium on Wood Machining, May 21–23, 2007, Lausanne, Switzerland

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Bjurhager, I., Berglund, L.A., Bardage, S.L. et al. Mechanical characterization of juvenile European aspen (Populus tremula) and hybrid aspen (Populus tremula × Populus tremuloides) using full-field strain measurements. J Wood Sci 54, 349–355 (2008). https://doi.org/10.1007/s10086-008-0960-x

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  • DOI: https://doi.org/10.1007/s10086-008-0960-x

Key words

  • Hybrid aspen
  • Juvenile
  • Populus tremula × tremuloides
  • Tensile strength
  • Young’s modulus