Effect of grain angle on shear strength of glued end grain to flat grain joints of defect-free softwood timber |
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Authors: | Jürgen Follrich Alfred Teischinger Wolfgang Gindl Ulrich Müller |
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Institution: | (1) Wood Kplus – Competence Center for Wood Composites and Wood Chemistry, Linz Austria, Peter Jordan Strasse 82, 1190 Vienna, Austria;(2) Department of Material Sciences and Process Engineering, Institute of Wood Science and Technology, BOKU – University of Natural Resources and Applied Life Sciences, Vienna, Austria |
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Abstract: | To evaluate the effect of grain orientation on the adhesive bond strength, three-layered Norway spruce wood specimens were
tested in shear. The two axial-oriented outer layers were jointed with the middle layer using three typical glues for load
bearing constructions, i.e. one-component polyurethane (PUR), melamine–urea–formaldehyde (MUF) and phenol–resorcinol–formaldehyde
(PRF). The grain orientation of the middle layers was varied from 0° (parallel to grain of the surface layer) to 90° (perpendicular
to grain of the surface layer) in incremental steps of 10°. Samples with middle layers oriented parallel to the outer layers
showed shear values in the range of solid spruce wood. Decreased shear strength values were expected for increased grain angles
of the middle layer. However, no explicit tendency was observed for the shear strength in dependence of the grain direction.
In general, MUF-bonded samples showed slightly higher shear strength values compared with PUR- and PRF-bonded specimens. |
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