چكيده به لاتين
Adhesive joints, due to their unique features, are the most widely used joints in various industries, such as aerospace and marine industries. Researchers have provided various methods for increasing the strength of adhesive joints. Among these methods, it is possible to change the geometric parameters of the adhesive joints, adding particles in different dimensions, adding fibers to the adhesive layer and adding various nanoparticles, such as carbon nanoparticles, graphene, clay, etc. to the adhesive base material to improves mechanical properties in the joint. Some of the nanoparticles such as carbon nanotubes, have different properties in the longitudinal and transverse direction due to their structure. various methods are used to control orientation of the particles in the resin, such as electric and magnetic field.
In this research, was used an electric field to align the carbon nanotubes in the adhesive layer. The nanotubes are distributed in the adhesive and by making a double cantilever beam, mode I tested and the maximum adhesive joint strength in the weight percentages of 0.1, 0.3 and 0.5 was investigated in random and align nanotube distribution states. Adding 0.1 and 0.3 wt.% of carbon nanotubes increased by 20.1% and 54.8%, respectively, but added 0.5 wt.% Carbon nanotube decrease to 50.6% compare to non-reinforced adhesive. With the align of the nanotubes, the maximum adhesive joint strength was also increase compare to random state. In the 0.1, 0.3 and 0.5 wt.% carbon nanotubes maximum adhesive joint strength 31, 21.4
And -0.3% changed, respectively.
The cohesive zone model was used to investigate the failure behavior of these adhesives. The traction-separation parameters were described. Traction-separation graphs of adhesives with different wt.% and random and align proportions were investigated. Finite element analysis was also done and there was acceptable agreement between experimental and numerical curves.
