Influence of production based surface topography and release agent amount on bonding properties of CFRP

Mund, M.; Lippky, Kristian; Blass, David M.; Dilger, Klaus

doi:10.1016/j.compstruct.2019.02.026

Cited by 14 publications

(5 citation statements)

References 11 publications

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“…The surfaces of the fabricated composites consisted of structured topography as expected and reported better bonding strengths than the smooth surfaces. [17] Above examples indicate two fundamental factors affecting the adhesion: 1) surface polarity of the resin and the metal and 2) surface roughness; these experimental observations are in agreement with the adhesion theories and represent well the fundamental factors for surface wettability.…”

Section: Introductionsupporting

confidence: 77%

“…Although release coatings are effective in preventing resin-metal adhesion, their residual material transferring to the demolded composite surface is of concern, for example, when the final composite product requires to be bonded with other composite/metal components. [14][15][16] As a solution, Mund et al (2019) carried out a study to increase the bonding properties of composites demolded from a metal mold containing release agents. They incorporated an irregular roughness to the mold such that it imprinted on the composite part.…”

Section: Introductionmentioning

confidence: 99%

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Tailoring Resin–Metal Adhesion by Femtosecond Laser Surface Texturing

Rathnayaka,

Kietzig

2024

Physica Status Solidi (a)

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Epoxy resin wettability and adhesion on metal surfaces are of interest to composite manufacturing processes in two aspects: while higher adhesion is desired for composite to metal part bonding, lower adhesion is expected for metal tools used in the composite fabrication process. Among several surface modification techniques to achieve such increased/decreased adhesion strengths, femtosecond laser micromachining is a sustainable and scalable technique. Therefore, this study aims to explore epoxy resin adhesion behavior against femtosecond laser micromachined aluminum surfaces as a function of different microscale topographies. The texture types include microscale hexagonal and cylindrical hole patterns with different solid/air surface fractions and comparatively smaller‐scale laser‐induced periodic surface structures. Based on polished metal contact angle results, desired texture geometries are selected in a range to theoretically favor or inhibit resin penetration into microcavities. Theoretical predictions are derived from the capillary effect and Gibb's energy difference. The adhesion strength of resin to metal is examined by tensile tests. All the laser‐textured surfaces show considerably increased adhesion strengths compared to polished surfaces. Scanning electron microscopy and laser profilometry analysis on failed surfaces confirm resin penetration into all textures. Nevertheless, hexagonal holes, which exhibit the highest microcavity volume, show potential for air trapping.

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Section: Introductionsupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Tailoring Resin–Metal Adhesion by Femtosecond Laser Surface Texturing

Rathnayaka,

Kietzig

2024

Physica Status Solidi (a)

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“…This release agent remained as a contaminant on the PCM CFRP surface. Such contaminants reduce adhesive performance [17]. Therefore, surface treatment is often required.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Surface Properties of Carbon Fiber Reinforced Plastic by Epoxy Modified Primer with Plasma for Automotive Applications

et al. 2020

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Carbon fiber reinforced plastic (CFRP) is currently used as a lightweight material in various parts of automobiles. However, fiber reinforced plastic (FRP) material may be damaged at the time of joining via mechanical bonding; therefore, adhesion is important. When bonding is conducted without surface CFRP treatment, interfacial destruction occurs during which the adhesive falls off along with the CFRP. Mechanical strength and fracture shape were investigated depending on the surface treatment (pristine, plasma treatment times, and plasma treatment times plus epoxy modified primer coating). The plasma treatment effect was verified using the contact angle and X-ray photoelectron spectroscopy. The wettability of the epoxy modified primer (EMP) coating was confirmed through surface morphology analysis, followed by observation of mechanical properties and fracture shape. Based on test data collected from 10 instances of plasma treatment, the EMP coating showed 115% higher strength than that of pristine CFRP. The adhesive failure shape also changed from interfacial failure to mixed-mode failure. Thus, applying an EMP coating during the automotive parts stage enhances the effect of CFRP surface treatment.

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“…to the surface of the hole wall will lead to uneven stress distribution during the connection of the components, resulting in a decrease in the load-bearing capacity [16][17]. Due to the different cutting mechanisms of different ber angles in CFRP (see Fig.…”

Section: Surface Roughness Of Hole Wallmentioning

confidence: 99%

“…The thrust force is an important factor that affects the exit surface delamination, and lower thrust force helps reduce exit delamination damage [16][17]. Figure 6 shows the relationship between thrust force and feed displacement under f=0.04mm/r, n=2100rpm cutting parameters.…”

Section: Comparison and Analysis Of Thrust Forces In Different Strategiesmentioning

confidence: 99%

The Study of CFRP Variable Feed Drilling Method Based on Sinusoidal Curve

Wang

Liang

2022

Preprint

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In order to reduce the delamination damage of carbon fiber reinforced polymer (CFRP) drilling and improve the drilling quality. A variable feed drilling method based on sinusoidal curve was proposed, that is, when the drill at a distance of 1mm from the hole exit, the feed rate of the drill would be reduced according to the rule of sinusoidal curve. The method is compared with the traditional feed drilling by experiment, and the influence of the variable feed drilling on thrust force, delamination factor, surface quality, surface roughness of hole wall and exit hole wall morphology are analyzed. The results show that compared with constant-feed drilling, the variable-feed drilling based on sinusoidal curve reduces the thrust force near the hole exit, and greatly improves the delamination factor, surface quality and hole wall morphology at the exit. But the influence on the hole wall roughness is not particularly obvious.

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Influence of production based surface topography and release agent amount on bonding properties of CFRP

Cited by 14 publications

References 11 publications

Tailoring Resin–Metal Adhesion by Femtosecond Laser Surface Texturing

Tailoring Resin–Metal Adhesion by Femtosecond Laser Surface Texturing

Enhanced Surface Properties of Carbon Fiber Reinforced Plastic by Epoxy Modified Primer with Plasma for Automotive Applications

The Study of CFRP Variable Feed Drilling Method Based on Sinusoidal Curve

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