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.
Highlights
Carbon fibre reinforced thermoplastic composites (TPCs) offer many advantages over thermoset composites (TSCs), including a high resistance to impact and fracture damage, the ability to be re-melted and re-shaped and a low storage cost as a result of an infinite shelf life
This work proposed to use a high-power Ultraviolet light (UV)-irradiation technique to rapidly prepare the surfaces of carbon fibre reinforced Polyphenylene sulfide (PPS) and Polyether ether ketone (PEEK) composites for the adhesive joining
The results of a single lapshear joint test demonstrated that applying UV-irradiation to the PPS composites for 3 s and to the PEEK composites for 5 s was sufficient to transform the failure mode of the adhesive joints from interface failure to severe substrate damage
Summary
Carbon fibre reinforced thermoplastic composites (TPCs) offer many advantages over thermoset composites (TSCs), including a high resistance to impact and fracture damage, the ability to be re-melted and re-shaped and a low storage cost as a result of an infinite shelf life. It was reported that a lap-shear strength of 25 MPa had been obtained for hybrid Polyphenylene sulphide/Aluminium joints, showing some promise for industrial application While each of these methods has its own strengths and weakness, adhesive bonding is unique for joining thin-walled sections or elements with a significant difference in thickness [13]. This work investigated the effectiveness of a high-power UV-irradiation technique as a surface preparation method for the adhesive joining of carbon fibre reinforced PPS and PEEK composites. The lap shear strength and mode-I and mode-II fracture energies of the adhesive joints were studied, and the corresponding failure mechanisms were analysed
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