Effect of infrared laser surface treatment on the morphology and adhesive properties of scarfed CFRP surfaces

Harder, Sergej; Schmutzler, Henrik; Hergoss, Philipp; de, Jens Freese; Holtmannspötter, Jens; Fiedler, Bodo

doi:10.1016/j.compositesa.2019.02.025

Cited by 43 publications

(13 citation statements)

References 30 publications

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“…Another scarfing approach with laser ablation technologies is generally possible (see Figure 3(c)). 13–15 The technology has to be carefully matched to each material. 16 It can be used as an additional method for stripping lose fibers and for micro roughening to improve bonding.…”

Section: State Of the Artmentioning

confidence: 99%

Automated removal of carbon fiber reinforced plastic layers for the repair by adhesive bonding

Brieskorn

Hintze

2020

Proceedings of the Institution of Mechanical Engineers, Part G:

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For the industrial repair of carbon fiber reinforced plastics (CFRP), scarfing is used to re-establish the load path. In the industry today, the state of the art removal of CFRP layers for a repair process is done mainly manually, leading to a time-consuming process. Therefore, an automation of this process is desirable. Today, vacuum suction blasting is used to pre-treat CFRP surfaces only for the superficial removal of impurities or the removal of the cover layer before bonding. With the common used blasting agents and nozzle geometries, the even removal of larger areas together with the fiber was not possible. This work shows that the technology of vacuum suction blasting was adapted to be used as an automated scarfing method. A combination of blasting parameters, especially the nozzle geometries together with a blasting agent were found to be able to remove CFRP layers precisely, detecting and correcting errors in-line with a line scanner-measuring unit. The presented method allows treating large-scale surfaces, scarfing the area one single layer at a time, increasing the removal rate in comparison to common blasting. With vacuum suction blasting the grinding dust emissions and process forces are low, post cleaning or further surface activation are not necessary and the removal results can directly be controlled. Challenges still exist with inaccurate removal due to interruptions in the blasting program and the generation of sharp edges for a stepped scarf.

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Section: State Of the Artmentioning

confidence: 99%

Automated removal of carbon fiber reinforced plastic layers for the repair by adhesive bonding

Brieskorn

Hintze

2020

Proceedings of the Institution of Mechanical Engineers, Part G:

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“…Despite that the absorption takes place on the carbon fibers, the matrix can be removed due to pyrolysis in the transition zone between carbon fibers and the epoxy matrix itself resulting in a recoil pressure removing the surrounding materials [6] . Investigations revealed that evaporations, broken carbon fibers as well as delamination in the CFRP laminate due to combustions [7,8] and voids could not be completely filled by adhesive [9] . However, the surface composition is affected positively, Li et al increased the amount of functional groups (carbonyl and carboxyl) on the surface with a NIR-laser wavelength [10] .…”

Section: Introduction and State Of The Artmentioning

confidence: 99%

“…This effect can also be used to increase the fiber-matrix-adhesion by creating sawtooth-likes profile on the carbon fibers [19] . The nano-and microscale roughness of the exposed carbon fibers by NIR laser treatment also lead to improved mechanical shear strengths [9,11] .…”

Section: Introduction and State Of The Artmentioning

confidence: 99%

Comprehensive study on the influence of different pretreatment methods and structural adhesives on the shear strength of hybrid CFRP/aluminum joints

Schanz

Meinhard

Dostal

et al. 2021

The Journal of Adhesion

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The aim of this study was to investigate the influence of laser treatments with varying energy density and wavelength on the surface structure, shear strength and fracture behavior of hybrid compounds of thermoset carbon fiber reinforced polymer (CFRP) and aluminum (Al) bonded with three different structural adhesives. The CFRP was pretreated by laser with near-infrared (NIR) and ultraviolet (UV) wavelengths and applying different energy densities. Aluminum surfaces were structured with NIR. Reference CFRP/Al-specimens were prepared by acetone cleaning, low pressure oxygen/argon plasma or sand blasting. The surfaces were investigated microscopically before bonding and after mechanical testing. In addition, the surfaces were examined with white light interferometer and sessile droplet test methods. The bonded compounds were characterized in standardized single lap shear tests to reveal the influence of the pretreatment strategies on the joint strength. Suitable process windows for laser pretreatments were identified, including NIR-pretreatment methods that can compete with an UV-laser source. For every adhesive, a suitable pretreatment method was found.

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“…The characteristics of these adhesive materials are remarkable. As a result, these significant weaknesses led to the need to produce better adhesives and appropriate surface processing equipment to make adhesive surfaces effective [4], [5]. Also, scarf joints are believed to have defects, such as gaps, voids, ineffective surface, and curing, which may affect the quality of the bond, as well as both dynamic, and static responses [16].…”

Section: Introductionmentioning

confidence: 99%

Modelling of Harmonic Response of Scarf Adhesive Joints

Alqahtani¹,

Almitani²,

Othman³

2021

EJENG

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Adhesives are used for attaching structures to various spacers such as tubular and scarf joints to replace the traditional joining methods of welding, brazing, soldering, etc. Many of the unique features associated with adhesives are low manufacturing cost, long component life, and lightweight. Accordingly, a considerable amount of study has been carried out and is still underway to develop. The main objective of this study is to investigate the response of the scarf joints when exposed to a harmonic load. The finite element method (FEM) using ANSYS is availed to study and analysis the natural frequencies, mode shape, and frequency response. Additionally, the influence of the adhesion angle is examined.

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Effect of infrared laser surface treatment on the morphology and adhesive properties of scarfed CFRP surfaces

Cited by 43 publications

References 30 publications

Automated removal of carbon fiber reinforced plastic layers for the repair by adhesive bonding

Automated removal of carbon fiber reinforced plastic layers for the repair by adhesive bonding

Comprehensive study on the influence of different pretreatment methods and structural adhesives on the shear strength of hybrid CFRP/aluminum joints

Modelling of Harmonic Response of Scarf Adhesive Joints

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