Analysis of the removal of peel ply from CFRP surfaces

Buchmann, Christopher; Langer, Sebastian; Filsinger, Jürgen; Drechsler, Klaus

doi:10.1016/j.compositesb.2015.11.019

Cited by 22 publications

(9 citation statements)

References 12 publications

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“…With larger peel strength, fibre tears are more frequent. However, as Buchmann et al showed, the occurrence of defects can be beneficially influenced by optimizing peel angle, peel ply orientation, and peel ply material [25].…”

Section: Resultsmentioning

confidence: 99%

Investigation of fluorine-based release agents for structural adhesive bonding of carbon fibre reinforced plastics

Thull

Zimmer²,

Hofmann³

et al. 2019

Appl Adhes Sci

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IntroductionAdhesive joining is increasingly used in many industries because of the advantages it provides compared to conventional structural joining methods (e.g. riveting). This applies in particular to fibre-reinforced composites, as a rivet hole interrupts the fibres and thus weakens the mechanical properties of the laminate. In aerostructures, adhesive bonding is applied in metal-to-metal joints, composite-to-composite joints and composite-to-metal joints both for assembling parts and for patch-repairing.The quality of a bonded joint depends on the adhesive, the manufacturing process, the environmental and loading conditions, as well as from the surface of the substrates to be joined. The surfaces of CFRP components to be joined by adhesive bonding are often textured surfaces resulting from the used peel plies during production or mechanical pre-treatment such a sanding or milling. AbstractPeel plies can be used during the manufacture of fibre-reinforced plastics for two reasons: to protect the surface during transport and storing the parts as well as during subsequent work steps, such as adhesive bonding, the removal of the peel ply can result in bondable surface with required surface characteristics. However, the use of peel plies is not straightforward. It can be difficult to remove peel plies and a surface produced by a peel ply is altered in terms of roughness and elemental composition. In the present work, the influence of fluorine-based release agents on adhesive joining of carbon fibre reinforced composites is investigated. Within the scope of the screening, 14 fluorine-based release agents-ETFE release films, PTFE coated glass fabrics as well as fabrics made of PTFE fibres-were investigated. Preliminary studies (Meer, in: Deutscher Luft-und Raumfahrtkongress 2014, Augsburg, 2015 have shown that ETFE films have advantages in terms of adhesion. The study covers a number of aspects: the determination of the tear strength of the release agent by peel test; the determination of the element composition (XPS) and surface characteristics (SEM) before and after atmospheric pressure plasma pre-treatment, characterization the topology and the characterization of the adhesive strength by centrifugal adhesion test. which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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Section: Resultsmentioning

confidence: 99%

Investigation of fluorine-based release agents for structural adhesive bonding of carbon fibre reinforced plastics

Thull

Zimmer²,

Hofmann³

et al. 2019

Appl Adhes Sci

View full text Add to dashboard Cite

show abstract

“…After the specimens were conditioned at room temperature, they were subjected to a peel test. A peel angle 90° was chosen for tests because the peel force usually reaches the highest value at this angle [13].…”

Section: Prototype Removal (Peel Strength)mentioning

confidence: 99%

“…The indicator tape must have a sufficient shelf-life, the long-term ability for visual response in the adherent state. The peel (removable) force of the tape after employing must be less than that of the surface fiber layer of the composite construction itself [13].…”

Section: Introduction *mentioning

confidence: 99%

Development of Removable Visual Impact Indicator or Polymer Composite Materials

Vidinejevs

Bulderberga

Aniskevich

2021

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The prototype of removable visual impact indicator for thermoset polymer composite materials is developed, and its characteristics are experimentally determined. The indicator is a fabric tape glued by epoxy to the surface of the polymer composite. The tape is impregnated with a composition that provides a visual response at the place of an impact on the composite surface. Ball-drop tests demonstrated the increase of the magnitude of the visual response with the impact energy at different substrate hardnesses. The shelf-life and mode of the tape storage until commissioning are determined. Peel tests showed the ability to remove a used indicator without damaging the surface of the composite.

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“…Dehaghani [23] et al used acid etching to treat the surface of a polyethylene liner and investigated the effect of surface treatment duration on the adhesive bonding of E-glass/epoxy composites to the liner. However, abrasives [24] or peel plies [25,26] are generally used for surface treatment in the actual manufacturing process. Mechanical abrading is a labor-intensive, worker's-skill-dependent, costly phase [27], and the treatment quality is difficult to measure.…”

Section: Introductionmentioning

confidence: 99%

“…A wet peel ply contains fabric and a resin system similar to the matrix resin of the composite material, so it is beneficial to protect the composite layer. Buchmann [25] et al studied the effect of peeling angle, peel ply orientation, and peel ply material on the peeling force required to remove the peeling layer from the CFRP surface, and the results showed that a sharp peel angle close to 180 • could reduce the peeling force and fiber breakouts. Martínez-Landeros [30] et al compared the effects of different surface treatment types on the bonding effect of structural adhesives for CFRP.…”

Section: Introductionmentioning

confidence: 99%

Surface Treatment of Composites with Bismaleimide Resin-Based Wet Peel Ply for Enhanced Adhesive Bonding Performance

Zhao

Qiao

et al. 2021

Polymers

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Surface treatment is typically required to improve the bonding performance of carbon-fiber-reinforced composites. Herein, a wet peel ply was prepared using bismaleimide (BMI) resins as a matrix resin. The temperature–heating rate extrapolation method and rheological method were employed to study the reaction characteristics and viscosity-temperature characteristics of the matrix in the BMI wet peel ply. The curing temperatures of the BMI wet peel ply and the BMI prepreg were the same (200 °C), making this wet peel ply suitable for co-curing with the BMI prepreg. After treatment with the wet peel ply, the bonding strength of the BMI composite joint showed a mean shear strength of 35.5 MPa, which was 1.72% higher than that of the sanded composite and 17.5% higher than that of the composite treated with the dry peel ply. In addition, the BMI composite treated with the BMI wet peel ply exhibited good bonding stability with a coefficient of variation of 3.9. After damp-heat aging for 1440 h, the retention rate of shear strength at room-temperature was 82.3%. The relatively loosely woven carrier in the BMI wet peel ply increased the surface roughness of the composite, thus improving the bonding strength.

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Analysis of the removal of peel ply from CFRP surfaces

Cited by 22 publications

References 12 publications

Investigation of fluorine-based release agents for structural adhesive bonding of carbon fibre reinforced plastics

Investigation of fluorine-based release agents for structural adhesive bonding of carbon fibre reinforced plastics

Development of Removable Visual Impact Indicator or Polymer Composite Materials

Surface Treatment of Composites with Bismaleimide Resin-Based Wet Peel Ply for Enhanced Adhesive Bonding Performance

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