TY - JOUR
T1 - Effect of interlaying UV-irradiated PEEK fibres on the mechanical, impact and fracture response of aerospace-grade carbon fibre/epoxy composites
AU - Quan, Dong
AU - Deegan, Brian
AU - Binsfeld, Lucas
AU - Li, Xiping
AU - Atkinson, Jason
AU - Ivanković, Alojz
AU - Murphy, Neal
PY - 2020/6/15
Y1 - 2020/6/15
N2 - Poly-etherether-ketone (PEEK) fibres (average diameter 30μm) were surface-activated by a UV-irradiation technique, and then used as interlayers of carbon fibre/epoxy composites. The results of a flatwise tensile test demonstrated a significant improvement in the PEEK fibre/epoxy adhesion upon the UV-treatment, i.e. the ultimate strength increased from 0.6–0.7MPa to 7.6MPa. Accordingly, interlaying UV-irradiated PEEK fibres resulted in considerable increases in the maximum values of open-hole tensile strength, Charpy impact strength and mode-I fracture energy, i.e. of 12%, 131% and 293%, respectively. However, it also decreased the flexural strength by 29%, owing to the thickness increase caused by adding interlayers. Fortunately, the load carrying capacity (the maximum failure load under flexural bending) was largely unaffected, and moreover, an average residual strength of 475 ± 23MPa still remained after the damage at the maximum load. The results demonstrated significant benefits of using longitudinal UV-irradiated PEEK fibres as interlayers of CFRPs.
AB - Poly-etherether-ketone (PEEK) fibres (average diameter 30μm) were surface-activated by a UV-irradiation technique, and then used as interlayers of carbon fibre/epoxy composites. The results of a flatwise tensile test demonstrated a significant improvement in the PEEK fibre/epoxy adhesion upon the UV-treatment, i.e. the ultimate strength increased from 0.6–0.7MPa to 7.6MPa. Accordingly, interlaying UV-irradiated PEEK fibres resulted in considerable increases in the maximum values of open-hole tensile strength, Charpy impact strength and mode-I fracture energy, i.e. of 12%, 131% and 293%, respectively. However, it also decreased the flexural strength by 29%, owing to the thickness increase caused by adding interlayers. Fortunately, the load carrying capacity (the maximum failure load under flexural bending) was largely unaffected, and moreover, an average residual strength of 475 ± 23MPa still remained after the damage at the maximum load. The results demonstrated significant benefits of using longitudinal UV-irradiated PEEK fibres as interlayers of CFRPs.
KW - A: PEEK-fibre interlayers
KW - A: Polymer-matrix composites (PMCs)
KW - B: Delamination
KW - D: Mechanical testing
KW - E: Surface treatment
UR - http://www.scopus.com/inward/record.url?scp=85081134202&partnerID=8YFLogxK
U2 - 10.1016/j.compositesb.2020.107923
DO - 10.1016/j.compositesb.2020.107923
M3 - Article
AN - SCOPUS:85081134202
SN - 1359-8368
VL - 191
JO - Composites Part B: Engineering
JF - Composites Part B: Engineering
M1 - 107923
ER -