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Significantly enhanced structural integrity of adhesively bonded PPS and PEEK composite joints by rapidly UV-irradiating the substrates

Journal Article (2020)
Author(s)

D. Quan (TU Delft - Structural Integrity & Composites)

R. C. Alderliesten (TU Delft - Structural Integrity & Composites)

C. A. Dransfeld (TU Delft - Aerospace Manufacturing Technologies)

I. Tsakoniatis (TU Delft - Aerospace Manufacturing Technologies)

S. Teixeira de Freitas (University College Dublin, TU Delft - Structural Integrity & Composites)

Gennaro Scarselli (University College Dublin, University of Salento)

Neal Murphy (University College Dublin)

Alojz Ivankovic (University College Dublin)

Benedictus Rinze (TU Delft - Structural Integrity & Composites)

Research Group
Structural Integrity & Composites
Copyright
© 2020 D. Quan, R.C. Alderliesten, C.A. Dransfeld, Ioannis Tsakoniatis, S. Teixeira De Freitas, Gennaro Scarselli, Neal Murphy, Alojz Ivanković, R. Benedictus
DOI related publication
https://doi.org/10.1016/j.compscitech.2020.108358
More Info
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Publication Year
2020
Language
English
Copyright
© 2020 D. Quan, R.C. Alderliesten, C.A. Dransfeld, Ioannis Tsakoniatis, S. Teixeira De Freitas, Gennaro Scarselli, Neal Murphy, Alojz Ivanković, R. Benedictus
Research Group
Structural Integrity & Composites
Volume number
199
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Abstract

A high-power UV-irradiation technique was proposed for the surface treatment of PPS and PEEK composites, aiming to achieve good adhesion with epoxy adhesives. The composite substrates were rapidly UV-irradiated for a duration of between 2–30s, and then bonded using an aerospace film adhesive to produce joints. Tensile lap-shear strength and mode-I and mode-II fracture energies of the adhesive joints were investigated. It was observed that the application of a short-time UV-irradiation to the substrates transformed the failure mode of the specimens from adhesion failure to substrate damage in all cases. This consequently resulted in remarkable improvements in the mechanical and fracture performance of the adhesive joints. For example, the lap-shear strength increased from 11.8MPa to 31.7MPa upon UV-irradiating the PPS composites for 3s, and from 8.3MPa to 37.3MPa by applying a 5s UV-irradiation to the PEEK composites. Moreover, the mode-I and mode-II fracture energies significantly increased from ∼50J/m2 to ∼1500J/m2 and from <300J/m2 to ∼7000J/m2, respectively for both of the adhesively bonded PEEK and PPS composite joints.