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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)

Dong Quan (TU Delft - Structural Integrity & Composites)

René Alderliesten (TU Delft - Structural Integrity & Composites)

Clemens Dransfeld (TU Delft - Aerospace Manufacturing Technologies)

Ioannis Tsakoniatis (TU Delft - Aerospace Manufacturing Technologies)

Sofia 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 Ivanković (University College Dublin)

Rinze Benedictus (TU Delft - Structural Integrity & Composites)

Research Group
Structural Integrity & Composites
DOI related publication
https://doi.org/10.1016/j.compscitech.2020.108358 Final published version
More Info
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Publication Year
2020
Language
English
Research Group
Structural Integrity & Composites
Volume number
199
Article number
108358
Downloads counter
341
Collections
Institutional Repository
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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.