چكيده به لاتين
The use of nanoparticles to improve the mechanical behavior of adhesive resins are widely used and has found .One of the important applications of nanoparticles in adhesives and resins is to improve the failure behavior of these materials. Nano particles, depending on their type, geometry and their weight percent, can have different effects on the behavior of the breakdown of adhesives and resins under different modes of loading. The cohesive zone model for mechanical damage modeling has found a special place. The purpose of this study was to investigate the effect of multi-wall graphene nanotubes on the behavior of epoxy base adhesive deflection under load loading modalities 1 and 2 using experiment tests and numerical modeling.
In this research, the effect of multi-wall graphene nanotubes particles (MWCNTs) with different percentages weighing 0.1, 0.3 and 0.5 was used to calculate the fracture energy in the epoxy base adhesive under loading methods I and II, and finally obtaining the viscous region model by direct method has been studied. The results of the tests showed that the addition of multi-wall graphene nanotubes resulted in increased fracture energy in weight percentages of 0.1 and 0.3 in loading mode I, which is the highest improvement in the mode of I failure due to the addition of 0.3% by weight of carbon nanotubes to 113% relative to the adhesive Pure was obtained. Also under Mode II loading Most Improved fracture energy 0.1% by weight by adding carbon nanotubes equal to 19 %, respectively. By increasing the weight percentages of carbon nanotubes from 0.3 for connections under mode I and from 0.1 for connections under mode II, the amount of adhesive energy lost a downward trend due to particle lump.
In the mode I adhesive fracture energy load of a double-edged caught by the test specimen cracked beam (DCB) and Mode II loading by bending test with end slot (ENF), respectively.
According to SEM images, the addition of multi-wall carbon nanotubes results in mechanisms such as intrusion, crack separation and bridging, which results in increased fracture energy. The behavior of adhesive refractory behavior with carbon nanotubes was modeled under the first and second loading modes using the cohesive zone model. To obtain the parameters of the cohesive zone model, a method based on equivalent softness was used. The experimental and numerical results were in good agreement with each other.
