Exploitation of rubbery electrospun nanofibrous mat for fracture toughness improvement of structural epoxy adhesive bonded joints

Minosi, S.; Cocchi, Davide; Maccaferri, Emanuele; Pirondi, A.; Zucchelli, Andrea; Mazzocchetti, Laura; Ambrosini, Daniele; Campanini, Fabio

doi:10.1016/j.jajp.2021.100050

Cited by 6 publications

(6 citation statements)

References 51 publications

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“…In Figure 5, a possible final structure of nanocomposite and interaction and hydrogen bonding between the epoxy chains and the carboxyl groups on CNTs in the optimal sample is shown. This interaction between the adhesive components increases the cohesive strength which is confirmed by the outcomes of the mechanical features 42,44,45 . Sample 6 is the finest sample regarding mechanical features and sample 8 is the worst sample regarding mechanical features.…”

Section: Resultsmentioning

confidence: 57%

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A novel epoxy adhesive with ground rubber tire powder and carboxylated multiwalled carbon nanotubes

Kazemi Esfeh,

Arefinia,

Moini Jazani

et al. 2023

Polymer Composites

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The present study was an attempt to improve the toughness, mechanical and adhesion properties, and thermal stability of a two‐phase epoxy DGEBA/Resole phenolic resin through the use of carboxyl‐modified multi‐walled carbon nanotubes (c‐MWCNTs) and ground rubber tire (GRT) powder. The effect of a hybrid reinforcement containing GRT and c‐MWCNT blend on the mechanical properties, thermal stability, and microstructure of the epoxy‐phenolic adhesive were evaluated by tensile test, TGA, and FESEM, respectively. The formulated adhesive was utilized in a lap joint metal to a composite in order to peruse the adhesion features, where the composite was an epoxy resin reinforced with carbon fibers and the metal was stainless steel 316 L. According to the tensile test, there were 32% rise in tensile strength, 27% rise in modulus, and a 64% rise in toughness with adding 0.5% wt c‐MWCNTs and 15 phr waste GRT powder to the epoxy‐phenolic matrix. Furthermore, adding 1% wt c‐MWCNTs of nanoparticles and GRT powder has resulted in a 15% increase in lap shear strength. It also can be seen that thermal stability for the formulated samples has experienced an upward trend compared to the neat epoxy composite.Highlights Epoxy adhesives based on GRT Powder, c‐MWCNTs particles and phenolic resin have been successfully prepared. The hybrid uses of GRT Powder and c‐MWCNTs particles can synergistically increase the tensile and lap shear strength The addition of c‐MWCNT nano particles and GRT Powder in an epoxy adhesive can have a dramatic rise in the toughness system compared to the neat epoxy adhesive. Maximum degradation temperature of the produced newly adhesive has increased considerably in contrast with the neat epoxy adhesive.

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Section: Resultsmentioning

confidence: 57%

“…This interaction between the adhesive components increases the cohesive strength which is confirmed by the outcomes of the mechanical features. 42,44,45 Sample 6 is the finest sample regarding mechanical features and sample 8 is the worst sample regarding mechanical features.…”

Section: Tensile Strength Of the Adhesivesmentioning

confidence: 99%

A novel epoxy adhesive with ground rubber tire powder and carboxylated multiwalled carbon nanotubes

Kazemi Esfeh,

Arefinia,

Moini Jazani

et al. 2023

Polymer Composites

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“…The dimensionless parameters λσ and k are reported in Equations ( 2) and (3): [71,72], where a 0 is 25 mm and g is 6 mm.…”

Section: Dcb Testmentioning

confidence: 99%

Evaluation of XD 10 Polyamide Electrospun Nanofibers to Improve Mode I Fracture Toughness for Epoxy Adhesive Film Bonded Joints

2023

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The demand for ever-lighter structures raises the interest in bonding as a joining method, especially for materials that are difficult to join with traditional welding and bolting techniques. Structural adhesives, however, are susceptible to defects, but can be toughened in several ways: by changing their chemical composition or by adding fillers, even of nanometric size. Nanomaterials have a high surface area and limited structural defects, which can enhance the mechanical properties of adhesives depending on their nature, quantity, size, and interfacial adhesion. This work analyzes the Mode I fracture toughness of joints bonded with METLBOND® 1515-4M epoxy film and XantuLayr electrospun XD 10 polyamide nanofibers. Two joint configurations were studied, which differed according to the position of the nanomat within the adhesive layer: one had the nanofibers at the substrate/adhesive interfaces, and the other had the nanofibers in the center of the adhesive layer. Double cantilever beam joints were manufactured to evaluate the Mode I fracture toughness of the bonding with and without nano-reinforcement. The nanofibers applied at the substrate/adhesive interface improved the Mode-I fracture toughness by 32%, reaching the value of 0.55 N/mm. SEM images confirm the positive contribution of the nanofibers, which appear stretched and pulled out from the matrix. No fracture toughness variation was detected in the joints with the nanofibers placed in the middle of the adhesive layer.

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“…Moreover, for each CTBN content, mode-II fracture toughness energy was considerably higher than that of mode-I. Minosi et al 41 evaluated the influence of inserting rubbery nanofiber mats into a structural epoxy adhesive on fracture behavior of steel-bonded joints. They found that specimens cured at 70 o C for 5 h had a maximum mode-I fracture toughness energy compared with joints cured at lower temperatures and longer times.…”

Section: Introductionmentioning

confidence: 99%

Mode-I and II fracture behavior of metal-to-composite bonded interfaces with a graphene nanoplatelet-reinforced structural epoxy adhesive

Javanmard Sistani,

Shariati,

Zamani

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part L:

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Epoxy adhesive joints are increasingly being used to bond structural components in automotive, marine, and aircraft bodies. However, poor fracture toughness energy and low resistance to crack growth in structural epoxy adhesives are important drawbacks of these adhesives. To overcome this challenge, this paper aims to investigate the influence of dispersing graphene nanoplatelets (GNPs) into Axson-Sika Adekit A 140-1 structural epoxy adhesive on the fracture behavior of aluminum-to-glass fiber-reinforced polymer composite joints under mode-I and mode-II fracture tests. Double cantilever beam (DCB) and end-notched flexure specimens were fabricated to perform mode-I and mode-II fracture tests. For each specimen, three specimen groups including neat and graphene nanoplatelet reinforced with 0.05 wt.%, 0.1 wt.%, and 0.2 wt.% were considered. Results revealed that, for both of mode-I and mode-II tests, the optimum fracture toughness energy was obtained by inserting 0.1 wt.% of nanoparticles. By addition of 0.05 wt.% and 0.1 wt.% of GNPs, mode-I fracture toughness energy was improved by 90% and 115% compared with neat DCB specimens, while mode-II energy release rate increased by 55% and 83%, respectively. Finally, debonded surfaces were examined using optical microscope and scanning electron microscopy in order to find failure patterns and microstructural reinforcing mechanisms.

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Exploitation of rubbery electrospun nanofibrous mat for fracture toughness improvement of structural epoxy adhesive bonded joints

Cited by 6 publications

References 51 publications

A novel epoxy adhesive with ground rubber tire powder and carboxylated multiwalled carbon nanotubes

A novel epoxy adhesive with ground rubber tire powder and carboxylated multiwalled carbon nanotubes

Evaluation of XD 10 Polyamide Electrospun Nanofibers to Improve Mode I Fracture Toughness for Epoxy Adhesive Film Bonded Joints

Mode-I and II fracture behavior of metal-to-composite bonded interfaces with a graphene nanoplatelet-reinforced structural epoxy adhesive

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