Adhesives. Wood adhesives for non-structural applications. Determination of tensile shear strength of lap joints

2017 ◽  
Keyword(s):  
Shear Strength ◽  
Lap Joints ◽  
Tensile Shear Strength ◽  
Tensile Shear ◽  
Wood Adhesives ◽  
Structural Applications

Tensile shear strength of UF- and MUF-bonded veneer related to data of adhesives and cell walls measured by nanoindentation

Holzforschung ◽  
2010 ◽  
Vol 64 (3) ◽  
Author(s):  
Frank Stöckel ◽  
Johannes Konnerth ◽  
Wolfgang Kantner ◽  
Johann Moser ◽  
Wolfgang Gindl
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Bond Strength ◽  
Cell Walls ◽  
Urea Formaldehyde ◽  
Lap Joints ◽  
Tensile Shear Strength ◽  
Tensile Shear ◽  
Interphase Cell ◽  
Cure Time

Abstract The tensile shear strength of veneer lap joints was characterised. The joints were produced with an Automated Bonding Evaluation System (ABES) using urea-formaldehyde (UF) as well as melamine-urea-formaldehyde (MUF) adhesive formulated for particleboard production. At a fixed heating temperature of 110°C, a systematic increase in bond strength was observed for both adhesives with increasing cure time. The absolute bond strength was significantly higher for MUF compared to UF. Nanoindentation experiments with the same specimens used for ABES revealed a very hard, stiff and brittle character of the UF resin, whereas the MUF proved significantly less hard and stiff, and less brit-tle. Wood cell walls in contact with adhesive, i.e., where adhesive penetration into the cell wall was assumed, showed significantly altered mechanical properties. Such cell walls were harder, stiffer and more brittle than unaffected reference cell walls. These effects were slightly more pronounced for UF than for MUF. Comparing UF and MUF, the micro-mechanical properties of cured adhesive and interphase cell walls confirm earlier observations that tougher adhesives can lead to higher macroscopic bond strength. In strong contrast to that, no obvious correlation was found between micromechanical properties and the strong cure time dependence of macroscopic bond strength.

scholarly journals Tensile shear strength of laser lap joints

2013 ◽  
Vol 31 (3) ◽  
pp. 222-229
Author(s):  
Seiji FURUSAKO ◽  
Yasunobu MIYAZAKI ◽  
Yoshiaki AKINIWA
Keyword(s):  
Shear Strength ◽  
Lap Joints ◽  
Tensile Shear Strength ◽  
Tensile Shear

Tensile shear strength of laser lap joints

2015 ◽  
Vol 29 (11) ◽  
pp. 838-846 ◽  
Author(s):  
Seiji Furusako ◽  
Yasunobu Miyazaki ◽  
Yoshiaki Akiniwa
Keyword(s):  
Shear Strength ◽  
Lap Joints ◽  
Tensile Shear Strength ◽  
Tensile Shear
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