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Tensile-shear strength studies on self-bonded 2-ply birch veneer joint manufactured and tested by applying Automated Bonding Evaluation System (ABES) hot press
KTH.
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2016 (English)In: WCTE 2016 - World Conference on Timber Engineering, Vienna University of Technology , 2016Conference paper (Refereed)
Abstract [en]

An Automatic Bond Evaluation System (ABES) hot press was employed to manufacture a self-bonded joint between two veneers of rotary-cut birch (Betula pendula Roth). The hot-pressing conditions were 220 °C and 5.0 MPa, with press times ranging from 180 s to 600 s with 60 s intervals. Additionally, the log-soaking temperature (20 °C and 70 °C) and the veneer initial MC (6% and 11%) were varied to study the effect on the tensile-shear strength of the joints. For one set, the surface properties were altered by acetone extraction. The samples were tested at 11% MC. However, one set was partly duplicated and tested at 6% MC, to study how the testing conditions influenced the bond strength. The maximum average tensile-shear strength was 3.3 MPa, observed after 600 s hot pressing. The studies also included bond-line micromorphology analysis by applying SEM combined with a micromachining surface preparation technique based on UV excimer laser ablation. It was also indicated that longer hot-pressing times, lower veneer initial MC and a lower testing MC resulted in increased tensile-shear strength. Acetone extraction decreased the bond strength with increased standard deviation. Finally, the highest single and average strengths were observed for veneers from higher soaking temperature.

Place, publisher, year, edition, pages
Vienna University of Technology , 2016.
Keyword [en]
ABES, Birch, Laser ablation, Self-bonding, SEM, Soaking temperature, Tensile-shear strength, Veneer, Ablation, Acetone, Bond strength (materials), Excimer lasers, Extraction, Hot pressing, Presses (machine tools), Scanning electron microscopy, Shear flow, Tensile testing, Thermal logging, Timber, Veneers, Self bonding, Tensile shear strength, Tensile strength
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-207528ScopusID: 2-s2.0-85010960673ISBN: 9783903039001 OAI: oai:DiVA.org:kth-207528DiVA: diva2:1103904
Conference
2016 World Conference on Timber Engineering, WCTE 2016, 22 August 2016 through 25 August 2016
Note

Conference code: 124667; Export Date: 22 May 2017; Conference Paper. QC 20170531

Available from: 2017-05-31 Created: 2017-05-31 Last updated: 2017-05-31Bibliographically approved

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CiteExportLink to record
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