چكيده به لاتين
Researchers have proposed various methods to increase the strength of adhesive joints. Methods include changing the geometric parameters of the joint, adding particles in different dimensions, adding fibers to the adhesive layer, and so on. In adhesive bonding structures by adding different nanoparticles such as carbon nanotubes, graphene nanoparticles, clay, etc. to the adhesive base material improve the mechanical properties of adhesive bonds. Some nano particles, such as carbon nanotubes and graphene nano-plates, can be oriented and aligned due to their chemical and geometric structure as well as having different properties in length and width due to the application of electric or magnetic fields. Therefore, they are widely used in reinforcing adhesive bonding structures.
In this study, a combination of carbon nanotubes and graphene oxide nanofibers was used to reinforce epoxy adhesive. The composition of these nanoparticles in two randomly distributed and orientated modes, at two different weight percentages (0.1 and 0.3) with 1:1, 3:1, and 1:3 composition ratios (CNT:GoNP), and their effect on fracture behavior Composite adhesive joints have been investigated.
The adhesives used are composite glass / carbon / epoxy, unidirectional carbon fabric used as the electrode to create alternating electric field (AC), and the particle orientation is aligned with the adhesive thickness. By standard testing of a double-edged beam head and simple beam theory, the failure energy of crack growth initiation is calculated. The highest enhancement properties were observed for both 0.1 and 0.3 wt.% At 3:1 composition ratio of nanoparticles. 175% at the maximum bond strength, for the orientation state of 0.1 wt% of the nanoparticles with a 3:1 composition ratio of 222% at fracture energy and 148% at the maximum bond strength, compared to unreinforced adhesives.
These results indicate that by increasing the weight percentage of nanoparticles and the higher proportion of carbon nanotubes the adhesion breakage behavior is more improved. Scanning electron microscopy images of fracture surfaces were used to observe the mechanisms of crack formation, and mechanisms of cracking, cracking and extrusion in carbon nanotubes and graphene nano-plates, crack tip pinning, separation and plastic cavity growth were also observed.
