Effect of an Atmospheric Pressure Plasma Treatment on the Mode I Fracture Toughness of a Co-Cured Composite Joint

Mohan, Joseph; Ramamoorthy, Amsarani; Ivanković, Alojz; Dowling, Denis P.; Murphy, Neal

doi:10.1080/00218464.2013.772053

Cited by 19 publications

(9 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Addition of oxygen to the helium plasma leads to the absent of nitric oxide (NO) emission bands in the region of 200–300 nm. A probable explanation is that the quenching effect of molecular oxygen on the helium plasma results in a very low level of NO being formed …”

Section: Resultsmentioning

confidence: 80%

“…It is convenient to normalise the entire spectrum to the intensity of the N 2 + peak at 391 nm. This allows the intensity ratios of various peaks to be examined which can give a better insight into the generated plasmas . As shown in Figure , the normalised data indicates that, addition of oxygen to the helium plasma as expected yields an increase in the intensity of the oxygen emission line at 777 nm, while the intensity of the other emission lines decrease.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Enhancing the mechanical performance of additive manufactured polymer components using atmospheric plasma pre‐treatments

Abourayana

Dobbyn

Dowling

2017

Plasma Processes & Polymers

View full text Add to dashboard Cite

This study evaluates the use of a barrel atmospheric plasma system for the treatment of acrylonitrile butadiene styrene and polylactic acid polymer particles. Treatments were carried out in a helium discharge with either oxygen or nitrogen addition. The plasma activated polymer particles were then used to prepare filaments, which in‐turn were then used to fabricated parts by additive manufacturing. The resultant dog bone polymer parts exhibited up to a 22% increase in tensile strength, compared to parts fabricated using unactivated polymer particles. The explanation for the increased mechanical strength is the enhanced activation of the treated polymer particles, as well as the removal of contaminations from the polymer surface.

show abstract

Section: Resultsmentioning

confidence: 80%

Section: Resultsmentioning

confidence: 99%

Enhancing the mechanical performance of additive manufactured polymer components using atmospheric plasma pre‐treatments

Abourayana

Dobbyn

Dowling

2017

Plasma Processes & Polymers

View full text Add to dashboard Cite

show abstract

“…The higher degree of wettability achievable with graphene has allowed to extend the range of gases to be employed for the functionalization by taking into consideration also noble gases (He, Ar) and their mixtures with oxygen as can be seen from Table 4. In particular the attention was focused on the He/O 2 mixture for its capability to provide high energy on the surface of the particles with short treatment times [46], using different volumetric ratios between the two gases to carry out the functionalization tests. This choice was also supported by the higher efficiency of the plasma treatment in terms of lower reflective power obtained with respect to the employment of simple O 2 or Ar/O 2 gas mixture.…”

Section: Plasma Functionalizationmentioning

confidence: 99%

Investigation of Plasma-Assisted Functionalization of Graphitic Materials for Epoxy Composites

et al. 2019

View full text Add to dashboard Cite

In this study we evaluated the effect of microwave vacuum plasma for the surface functionalization of graphitic fillers (graphite and graphene); we also showed the effect of the functionalization on the mechanical and electrical properties of epoxy composites. Optimized conditions of plasma treatment were defined to obtain high plasma density and increased surface hydrophilicity of the fillers, with high stability of functionalization over time and temperature. However, the extent of such treatments proved to be limited by the high temperatures involved in the curing process of the resin. The use of specific gas mixtures (He/O2) during functionalization and the use of a high surface filler (graphene) can partially limit these negative effects thanks to the higher thermal stability of the induced functionalization. As a consequence, mechanical tests on graphene filled epoxies showed limited improvements in flexural properties while electrical resistivity is slightly increased with a shift of the percolation threshold towards higher filler concentration.

show abstract

“…In this context, one of the main goals of the aeronautical sector is to find new automatable methods that can be substituted for manual ones. Two technologies are gaining acceptance: atmospheric pressure plasma (APP) systems 9–13 and laser technologies. 8,14–20 APP systems use a high-frequency pulsed current, which, in combination with the flow of clean compressed air, generates highly reactive APP species.…”

Section: Introductionmentioning

confidence: 99%

“…These species oxidise the treated surface and create functional groups that increase the adhesive properties of the surface. Different studies 9–13 have demonstrated that APP surface treatment leads to high-strength adhesive bonding. Furthermore, this technology shows high throughput in-line manufacturing process capabilities, high possibilities of automation and relatively low processing costs.…”

Section: Introductionmentioning

confidence: 99%

Adhesive behaviour of carbon fibre reinforced plastic panels manufactured using woven and unidirectional tape after ultraviolet laser surface treatment

Botana-Galvin

Blanco

González-Rovira

et al. 2017

Journal of Composite Materials

View full text Add to dashboard Cite

This paper describes the results obtained when ultraviolet laser treatment was performed as a surface treatment prior to adhesive bonding for two aeronautical carbon fibre-reinforced plastics based on an epoxy resin prepreg. Different laser-processing parameters were employed, and their effect on the surfaces was analysed through morphological characterisation and wettability studies. X-ray photoelectron spectroscopy measurements were performed to determine the cleaning and activation effects of the treatment. The strength of the bonded joint was studied for laser-treated and manually ground samples. Samples processed under the selected laser conditions exhibited better adhesive behaviour than the manually treated samples, thereby suggesting that ultraviolet laser treatment could be used as an alternative method for surface activation of aeronautical composites based on epoxy resins.

show abstract

Effect of an Atmospheric Pressure Plasma Treatment on the Mode I Fracture Toughness of a Co-Cured Composite Joint

Cited by 19 publications

References 39 publications

Enhancing the mechanical performance of additive manufactured polymer components using atmospheric plasma pre‐treatments

Enhancing the mechanical performance of additive manufactured polymer components using atmospheric plasma pre‐treatments

Investigation of Plasma-Assisted Functionalization of Graphitic Materials for Epoxy Composites

Adhesive behaviour of carbon fibre reinforced plastic panels manufactured using woven and unidirectional tape after ultraviolet laser surface treatment

Contact Info

Product

Resources

About