For aluminum bonded joints a glycidoxypropyltrimethoxysilane--epoxy silane (Silqeust A-187 Silane, Momentive Company, USA), was used as a primer to chemically modify the aluminum
adherends.
Interface corner failure analysis of joint strength: effect of
adherend stiffness, International Journal of Fracture, 88(4):305-314.
Antunes, "Effect of
adherend's rigidity on the shear strength of single lap adhesive joints," International Journal of Adhesion and Adhesives, vol.
Because physical and elastomechanical properties of the
adherend are changed by wood modification, it is hypothesized that surface processing causes differentiating surface textures.
Adherend Young's modulus (MPa) 69450 Adhesive Young's modulus (MPa) 330
Adherend Poisson ratio 0.33 Adhesive Poisson ratio 0.35
Adherend thickness, t (mm) 2 Adhesive thickness, d (mm) 0.2 Overlap length, L (mm) 20 Free
adherend length, l (mm) 90 Applied load, P (MPa) 20 Reinforcement thickness, h (mm) 2 Reinforcement length, R (mm) 30, 40, 50, 60, 70, 80 [DELTA]R = R - L, [DELTA]R (mm) 10, 20, 30, 40, 50, 60 Table 2: Stress intensity factor in single-lap joints.
Adherend material is aluminum alloy 7075-T6 plate with 2mm thickness and epoxy based Araldite 2011 is used for the bonding of the substrates.
Wood as an
adherend. In: Treatise on Adhesion and Adhesives.
The numerical simulation of bonded assembly in three-dimensional is known delicate for reasons related to the mesh at the interface between adhesive and
adherend plats, especially when dealing an elastic-plastic material of adhesive and the substrates.
However, the adhesion between the adhesive and the backing is still important in that a low level of adhesion at this locale would result in transfer of the adhesive from the backing to the
adherend.
The compensating plate was prepared with the same thickness corresponding to specific
adherend.
Therefore, the information above illustrates the different patterns between PRF- and PU- bonded wood samples in terms of wood failure: PU adhesive may result in more cohesion or adhesive-adherend failure, whereas PRF adhesive results in more
adherend failure or wood failure.