An experimental investigation on low-cycle fatigue behavior of GO-NH<sub>2</sub>-reinforced epoxy adhesive

Dabbagh, Jamal; Behjat, Bashir; Yazdani, Mojtaba; Silva, Lucas F. M. da

doi:10.1177/1464420720977549

Cited by 3 publications

(3 citation statements)

References 48 publications

(64 reference statements)

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“…When fatigue loads are combined with different temperatures, this can lead to premature and unexpected failure of the adhesive joint. Some authors studied the effect of temperature on the failure mechanism on joints under fatigue conditions, [33][34][35] concluding that the failure mechanism does not significantly change as a percentage of adhesive and cohesive failure. However, lower temperatures resulted in a flatter fracture surface, while above a specific temperature, cracks started to be evident on the surface.…”

Section: Introductionmentioning

confidence: 99%

The role of loading mode on the property degradation of adhesives at high temperatures

Lopes

Akhavan‐Safar

Carbas

et al. 2023

Fatigue Fract Eng Mat Struct

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Despite existing studies on the effects of temperature on the behavior of bonded joints, the role of loading mode and test type (strength, fatigue, and fracture tests) on the rate of degradation of adhesive/joint properties at high temperatures has not been adequately investigated. The aim of the current study is to determine if adhesives experience the same rate of degradation at high temperature when they are subjected to different mode mixities. To do so, an epoxy adhesive was subjected to strength, fracture, and S–N fatigue tests, for modes I and II, at different temperatures. The results show that there is a significant difference between the rate of degradation in mode I/tensile and mode II/shear loading conditions. It was also found that the rate of degradation in adhesive properties is a function of test type. Based on the results, by increasing the temperature, a less reduction in tensile strength was found in the Arcan joints (almost 50% reduction) compared with the dogbone specimen (where the strength was reduced by less than 40%). According to the results, for all the considered tests, temperature sensitivity was more noticeable in tensile loading conditions compared with the shear mode. It is shown that despite the reduction in tensile fracture energy with temperature (by around 23%), the shear fracture energy was improved (by over 20%) at 50°C. Based on these results, an S–N model was also developed to create a master S–N curve, plotted as a function of temperature.

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Section: Introductionmentioning

confidence: 99%

The role of loading mode on the property degradation of adhesives at high temperatures

Lopes

Akhavan‐Safar

Carbas

et al. 2023

Fatigue Fract Eng Mat Struct

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“…Their experimental investigations also proved the positive effect of an RGO additive up to 0.25 wt% on the final strength of SLJs, especially at high temperatures near the glass transition temperature (T g ) of the adhesive. 13 Dabbagh et al 14 experimentally demonstrated that adding 0.1wt% and 0.3 wt% of functionalized aminated graphene oxide to an epoxy adhesive improves its mechanical properties as well as the fatigue life. Some investigations have reported a dual effect of the addition of graphene into epoxy resin.…”

Section: Introductionmentioning

confidence: 99%

The effect of graphene and graphene oxide on defective single lap adhesively bonded joints

Abdi

Khabaz-Aghdam

Hasan-nezhad

et al. 2022

Journal of Composite Materials

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The addition of nano-additives provides a path to improve joint performance. However, it is not clear if the use of these materials can alter the susceptibility of bonded joints to the presence of defects. This work aims to shed some light on this matter, by testing the performance of defective joints bonded with adhesives modified with nano-additives. Two different kinds of carbon-based nano-platelets, including graphene (G) and graphene oxide (GO), were used in this work as additives for adhesives used to bond single lap joints (SLJs). Bulk specimens, as well as three geometrically different SLJs were manufactured and tested. One configuration was manufactured without defects (WO), another with a disbond defect in the middle of the overlap, and another with a disbond defect on the edge of the overlap, known as a side defect (SD). These specimens were bonded with a neat epoxy adhesive and with the same adhesive modified with the addition of 0.3 wt% of G and GO. The addition of G and GO was found to improve Young’s modulus and the strength of the epoxy adhesive, while also decreasing its toughness. Dual effect of G and GO addition on improving the strength of the neat epoxy and WO SLJs while reducing the strength of some defective SLJs is also discussed using FT-IR and Raman spectrometry as well as scanning electron microscope pictures of the fracture surfaces.

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“…The reinforcement of 4 wt.% Al 2 O 3 nanoparticles to the epoxy increased the failure loads of joints having 20 mm overlap length by about 97%. Dabbag et al 17 investigated the mechanical and fatigue behavior of epoxy adhesive by adding functionalized graphene oxide (GO) into the adhesive. They concluded that optimum functionalized GO nanoplatelets weight percentages were 0.1 wt% and 0.3 wt% for the mechanical properties and the fatigue life, respectively.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of aluminum bonded joints reinforced with functionalized boron nitride and boron carbide nanoparticles

Gülteki̇n

Yazici

2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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In the presented study, the effect of hexagonal boron nitride and hexagonal boron carbide nanoparticles on the strength of adhesively bonded joints was investigated experimentally. Hexagonal boron nitride nanoparticles were functionalized using 3-(aminopropyl) triethoxysilane to improve adhesion and increase the interaction between epoxy and nanoparticles. Similarly, h-B4C nanoparticles were functionalized by using 3-(glycidyloxypropyl) trimethoxysilane. New structural nano adhesives were produced by reinforcing the functionalized nanoparticles into epoxy at different proportions (0.5 wt.%, 1.0 wt.%, 2 wt.%, 3.0 wt.%, 4.0 wt.%, and 5.0 wt.%). Two different epoxies with different viscosity values (MGS-LR285 and Araldite 2011) were used as adhesives, and aluminum alloy (AA2024-T3) was chosen as an adherend. Tensile test was carried out to determine the failure load of the adhesive joints, and the fracture surface morphology was examined after the test Additionally, Scanning electron microscopy and energy dispersion X-ray spectroscopy (SEM-EDS) analysis was performed to observe the distribution of boron nanoparticles in the adhesives. The experimental results showed that the reinforcement of hexagonal boron nitride and boron carbide nanoparticles to the adhesives increased the joint strength substantially depending on the reinforcement ratio and viscosity of the adhesives. The maximum increase in failure loads was achieved by adding 1 wt.% functionalized boron nitride to high viscosity Araldite 2011 adhesive and 2 wt.% to low viscosity MGS-LR285 adhesive, and the ratio of increase in failure loads is 31% and 63%, respectively. Moreover, by adding 2 wt.% functionalized boron carbide nanoparticles to the Araldite 2011 and MGS-LR285 adhesives, the strength of the joints increased by about 27% and 70%, respectively.

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An experimental investigation on low-cycle fatigue behavior of GO-NH₂-reinforced epoxy adhesive

Cited by 3 publications

References 48 publications

The role of loading mode on the property degradation of adhesives at high temperatures

The role of loading mode on the property degradation of adhesives at high temperatures

The effect of graphene and graphene oxide on defective single lap adhesively bonded joints

Mechanical properties of aluminum bonded joints reinforced with functionalized boron nitride and boron carbide nanoparticles

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An experimental investigation on low-cycle fatigue behavior of GO-NH2-reinforced epoxy adhesive

Cited by 3 publications

References 48 publications

The role of loading mode on the property degradation of adhesives at high temperatures

The role of loading mode on the property degradation of adhesives at high temperatures

The effect of graphene and graphene oxide on defective single lap adhesively bonded joints

Mechanical properties of aluminum bonded joints reinforced with functionalized boron nitride and boron carbide nanoparticles

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Product

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An experimental investigation on low-cycle fatigue behavior of GO-NH₂-reinforced epoxy adhesive