Journal
FORESTS
Volume 12, Issue 1, Pages -Publisher
MDPI
DOI: 10.3390/f12010087
Keywords
birch wood; fibre load angle; mechanical performance; size effect; veneers
Categories
Funding
- Amt der Niederosterreichischen Landesregierung [K3-F-712/001-2017]
- Weitzer Parkett GmbH CO KG
- Austrian Research Promotion Agency (FFG) [861421]
- Styrian Business Promotion Agency (SFG) [1.000.054.442]
- Standortagentur Tirol [FFG861421]
- DOKA GmbH
- DYNAmore GmbH
- EJOT Austria GmbH
- ForstHolz-Papier
- Holzcluster Steiermark GmbH
- IB STEINER
- Lean Management Consulting GmbH
- Magna Steyr Fahrzeugtechnik AG Co KG
- MAN Truck Bus AG
- MATTRO Mobility Revolutions GmbH
- Volkswagen AG
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The study investigates the influence of thickness and load angle on the tensile strength and tensile stiffness of peeled veneers compared to thin sawn timber. Results show a size effect for strength parallel to the grain, with significant variations in strength perpendicular to the grain based on thickness. The presence of lathe checks diminishes the strength of veneers compared to solid wood, highlighting the need for further research.
The development of high-performance, veneer-based wood composites is a topic of increasing importance due to the high design flexibility and the comparable mechanical performance to solid wood. Part of this improved mechanical performance can be contributed to the size effect present in wood. Based on previous findings in the literature, this size effect can be either strengthening or weakening. The presented study investigates the influence of thickness and load angle on the tensile strength and tensile stiffness of peeled veneers compared to thin sawn timber. Veneers with thicknesses of 0.5 +/- 0.05 mm, 1.0 +/- 0.05 mm and 1.5 +/- 0.05 mm as well as sawn wood with thicknesses of 1.5 +/- 0.1 mm, 3.0 +/- 0.1 mm and 5.0 +/- 0.1 mm were tested in tension under different load angles (0 degrees, 45 degrees and 90 degrees). The results only partly confirm a size effect for strength parallel to the grain. The strength perpendicular to the grain increased significantly between 0.5 mm and 1.5 mm, with a significant decrease between 1.5 mm and 5.0 mm. The presence of lathe checks diminished the strength perpendicular to the grain of the veneers by about 70% compared to solid wood, partly overshadowing a possible strengthening effect. It was concluded that a transition from a strengthening to a weakening behaviour lies in the range of multiple millimetres, but further investigations are needed to quantify this zone more precisely. The presented results provide a useful basis for the development of veneer-based wood composites with a performance driven layer-thickness.
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