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Open AccessArticle

Influence of Fiber Deviation on Strength of Thin Birch (Betula pendula Roth.) Veneers

1
Institute of Wood Technology and Renewable Materials, Department of Material Science and Process Engineering, University of Natural Resources and Life Sciences Vienna, Austria (BOKU), Konrad Lorenz Strasse 24, 3430 Tulln a.d. Donau, Austria
2
Department of Materials Science, University Leoben, Jahnstrasse 12, 8700 Leoben, Austria
*
Author to whom correspondence should be addressed.
Materials 2020, 13(7), 1484; https://doi.org/10.3390/ma13071484
Received: 27 February 2020 / Revised: 18 March 2020 / Accepted: 23 March 2020 / Published: 25 March 2020
(This article belongs to the Section Biomaterials)
The currently pursued implementation of wood into novel high performance applications such as automotive parts require knowledge about the material behaviour including ultimate strength. Previous research has shown that fiber deviation seems to be the dominating factor influencing the strength of thin veneers. This study aims to further investigate and quantify the influence of fiber deviation in two dimension and different hierarchical levels on the tensile strength of thin birch veneers. The fiber deviation in- and out-of-plane as well as the micro fibril angle were assessed by means of wide-angle X-ray scattering. Tensile strength was determined in laboratory experiments. Results show a high variability for in-plane fiber deviation mainly constituted by knots and other growth influencing factors. Pearson correlations between strength and fiber deviation ranged from −0.594 up to −0.852. Best correlation (r = −0.852) was achieved for maximum in-plane fiber deviation directly followed by a combined angle of in- and out-of-plane fiber deviation (r = −0.846). Based on the results it was shown that fiber deviation in- and out-of-plane is the dominating factor influencing ultimate tensile strength of thin birch veneers. Further research in regard to non-destructive strength prediction is necessary. View Full-Text
Keywords: fiber-load angle; high performance composites; micro fibril angle; non-destructive testing; tensile strength; wide-angle X-ray scattering fiber-load angle; high performance composites; micro fibril angle; non-destructive testing; tensile strength; wide-angle X-ray scattering
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MDPI and ACS Style

Pramreiter, M.; Bodner, S.C.; Keckes, J.; Stadlmann, A.; Kumpenza, C.; Müller, U. Influence of Fiber Deviation on Strength of Thin Birch (Betula pendula Roth.) Veneers. Materials 2020, 13, 1484.

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