Effects of Surface Treatment and Loading Speed on Adhesive Strength of Aluminum to Polycarbonate Lap Joints

The bonding strength of adhesive joints is influenced by the surface roughness of the joining parts. However, the magnitude of the influence has not yet been clarified because of the complexity of the phenomena. In this study, it is showed that surface treatment affects adhesive strength and durability of aluminum/polycarbonate single-lap joints, and loading speed affects tensile-shear strength of adhesive joints. To evaluate the effect of surface treatments on the adhesive strength, several surface treatment methods are used, that is, cleaning, grinding, SiC polishing and sand blasting. It is showed that an optimum value of the surface roughness exists with respect to the tensile-shear strength of adhesive joints. The adhesive strength shows linear relationship with the surface roughness and loading speed. And the mechanical removal of disturbing films of lubricants, impurities and oxides make adhesive strength increase significantly.

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Study on effects of pre-treatment and surface roughness on tensile-shear strength of 2060 Al–Li alloy adhesive joints

The Journal of Adhesion ◽

10.1080/00218464.2015.1124765 ◽

2016 ◽

Vol 93 (8) ◽

pp. 613-625 ◽

Cited By ~ 4

Author(s):

Xiaohong Zhan ◽

Jicheng Chen ◽

Cheng Gu ◽

Qingyu Peng ◽

Jie Chen ◽

...

Keyword(s):

Surface Roughness ◽

Shear Strength ◽

Adhesive Joints ◽

Tensile Shear Strength ◽

Tensile Shear ◽

Pre Treatment

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

10.3403/30315353u ◽

2017 ◽

Keyword(s):

Shear Strength ◽

Lap Joints ◽

Tensile Shear Strength ◽

Tensile Shear ◽

Wood Adhesives ◽

Structural Applications

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

Holzforschung ◽

10.1515/hf.2010.046 ◽

2010 ◽

Vol 64 (3) ◽

Cited By ~ 20

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.

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