The high viscosity gives rise to difficulties in application of the adhesives and may limit the wettability which in tum causes voids formation when spreading the viscous blend over the
adherend surface.
The curved lap joints were obtained separately for the
adherend thickness of h=6.5 mm, the overlap length of l=25 mm and radii of r=100, 300,500.
The cause of the residual error was believed to be the inability of the model to account for changes in
adherend rigidity, which would affect the solder joint constraint and hence the extent of its plastic deformation.
At a high enough load, the
adherend will detach from the substrate starting from the edge and proceed to the center as shown In the figure.
Oplinger, "Effects of
adherend deflections in single lap joints," International Journal of Solids and Structures, vol.
Among specific topics are preparing thick
adherend shear test specimens, quasi-testing bulk compression on flat specimens, the pin-and-collar test method, the compact mixed mode fracture test method, testing adhesive bonds under peel and shear loads at increased velocities, and measuring time-dependent crack growth.
One could attempt to calculate how changes at the adhesion interface would affect the work of adhesion (27), (29), (30) via changes in concentration of polar groups etc., perhaps ultimately leaving only Van der Waals forces to sustain adhesion, but this is not attempted here because it would depend on the chemistry of each substrate, as well as the chemistry of each
adherend. If the solvent has a greater affinity for the substrate than the polymer, then presumably the adhesion of the polymer would eventually be eliminated.
It is configured as to be heated and applied to an
adherend. The heat-sensitive adhesive material exhibits such an adhesive strength to the
adherend as to increase with time from immediately after applying the heat-sensitive adhesive material to the
adherend.
According to current adhesion theories, the main mechanism for adhesion involves intimate molecular contact, attained by intermolecular or valence forces exerted by molecules in the surface layers of the adhesive and
adherend. The task then is to create new bonding sites on the surface of the polymer.
Furthermore, as potential factors for bond durability, lower dimensional changes of modified wood during water sorption limit the movement of the
adherend and, thus, promote homogenous stress distributions (Frihart et al.