Tensile-shear strength studies on self-bonded 2-ply birch veneer joint manufactured and tested by applying Automated Bonding Evaluation System (ABES) hot press

Jussi Ruponen, Samuli Kimpimäki, Anti Rohumaa, Kristiina Laine, Kristoffer Segerholm, Magnus Wålinder, Lauri Rautkari, Mark Hughes

Tutkimustuotos: Artikkeli kirjassa/konferenssijulkaisussaConference contributionScientificvertaisarvioitu

Abstrakti

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.

AlkuperäiskieliEnglanti
OtsikkoWCTE 2016 - World Conference on Timber Engineering
KustantajaVienna University of Technology
ISBN (elektroninen)9783903039001
TilaJulkaistu - 2016
OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisuussa
TapahtumaWorld Conference on Timber Engineering - Vienna, Itävalta
Kesto: 22 elokuuta 201625 elokuuta 2016
Konferenssinumero: 14
http://wcte2016.conf.tuwien.ac.at/home/

Conference

ConferenceWorld Conference on Timber Engineering
LyhennettäWCTE
MaaItävalta
KaupunkiVienna
Ajanjakso22/08/201625/08/2016
www-osoite

Sormenjälki

Sukella tutkimusaiheisiin 'Tensile-shear strength studies on self-bonded 2-ply birch veneer joint manufactured and tested by applying Automated Bonding Evaluation System (ABES) hot press'. Ne muodostavat yhdessä ainutlaatuisen sormenjäljen.

Siteeraa tätä