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A semi-automatic method to determine the wood failure percentage on shear test specimens

  • Tina Künniger
Kurzoriginalia Brief Originals

Abstract

An alternative method to quantitatively determine the wood failure percentage on shear test specimens was developed, experimentally tested and successfully applied to specimens with typical combinations of adhesive types and wood species used by the glulam industry in Switzerland. The method consists of a staining technique for a better differentiation of wood fibers and adhesive, and an image processing procedure for a standardized estimation of the fractured surface ratio covered by wood fibers and adhesive, respectively. The semi-automatic method allows for a more objective determination of wood failure percentage and is suitable for quality control in the glulam industry.

Keywords

Malachite Green Wood Species Perc Color Contrast Glue Line 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

  1. 1.
    EN 301 (2001) Adhesives, phenolic and aminoplastics, for load-bearing timber structures – Classification and performance requirementsGoogle Scholar
  2. 2.
    EN 386 (2001) Glued laminated timber – Performance requirements and minimum production requirementsGoogle Scholar
  3. 3.
    EN 392 (1995) Glued laminated timber – Shear test of glue linesGoogle Scholar
  4. 4.
    Dibuz JJ, Shelton FJ (1967) Glueline Identification. For Prod J 17(10):20–22Google Scholar
  5. 5.
    DatInf Scientific Color (2007) www.datinf.deGoogle Scholar
  6. 6.
    Gibson MD, Krahmer RL (1980) Staining to Make Urea-Formaldehyde Resin Visible on Glued Wood Surfaces. For Prod J 30(1):46–48Google Scholar
  7. 7.
    Ginzel W, Stegmann G (1970) Nachträgliche Anfärbung von Harnstoff-Formaldehydharz-Bindemitteln auf beleimten Holzspänen zur visuellen Beurteilung der Leimverteilung. Holz Roh- Werkst 28(8):289–292CrossRefGoogle Scholar
  8. 8.
    Künniger T (2007) Automatische Bestimmung des prozentualen Faserbruchanteils bei der industriellen Klebfestigkeitsprüfung. FFWH Abschlussbericht. Empa Wood Laboratory, DuebendorfGoogle Scholar
  9. 9.
    Paulitsch M (1986) Methoden der Spanplattenuntersuchung. Springer-Verlag, Berlin Heidelberg New York TokyoGoogle Scholar
  10. 10.
    Plath L (1970) Mikroskopische Untersuchung von Holzverleimungen. Adhäsion 14(9):318–323, 336Google Scholar
  11. 11.
    Schriever E (1981) Einfacher qualitativer Nachweis von Harnstofformaldehydharzen und Diisocyanaten in Holzwerkstoffen. Holz Roh- Werkst 39:227–229CrossRefGoogle Scholar
  12. 12.
    Zeppenfeld G, Grunwald D (2005) Klebstoffe in der Holz- und Möbelindustrie. DRW-Verlag Weinbrenner & Söhne GmbH & CoKG, Leinfelden-EchterdingenGoogle Scholar

Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  1. 1.Wood LaboratoryEmpa, Swiss Federal Laboratories for Materials Testing and ResearchDuebendorfSwitzerland

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