DOI 10.1016/j.compositesa.2024.108258 This paper proposes a new methodology for the assessment of seawater ageing effects on impact-damaged composite laminates. CF/Epoxy laminates which were unimpacted, and impacted at 30 J, 60 J, and 90 J by hemispherical and conical impactors were subject to 4 months hydrothermal ageing in renewed natural seawater at 60 +/-2 °C. The majority of water uptake by impacted laminates (0.05 wt% − 0.3 wt%) occurred in the first 24 h and is believed to be held in damage cavities by capillary mechanisms. The increase in diffusive water uptake rate by the matrix due to impact damage was only small, at less than 0.008 wt%.mm.hr−0,5, compared with the total diffusive water uptake rate of 0.1 wt%.mm.hr−0,5. Hydrothermal ageing reduced the residual compressive strength of pristine laminates by 25 % and impact-damaged laminates by 8 % to 16 % for impacts between 30 J and 90 J.
Carbon fibre, Thermosetting resin, Damage tolerance, Impact behaviour, Moisture
| File | Pages | Size | Access | |
|---|---|---|---|---|
Publisher's official version | 14 | 16 Mo | ||
Fig. 15. Plot used to determine diffusivity using equation . | - | 70 Ko | ||
Fig. 16. Stress strain results for CAI tests on aged and unaged coupons. | - | 255 Ko | ||
Fig. 17. Ultrasonic scans of un-aged, hemispherical tip impacted, CF/epoxy coupons showing damage areas in blue. | - | 288 Ko | ||
Fig. 18. Ultrasonic scans of un-aged, conical tip impacted, CF/epoxy coupons showing damage areas in blue. | - | 299 Ko | ||
Fig. 19. Ultrasonic scans of conical tip impacted, CF/epoxy coupons prior to ageing showing damage areas in blue. | - | 292 Ko | ||
Fig. 20. Ultrasonic scans of hemispherical tip impacted, CF/epoxy coupons prior to ageing showing damage areas in blue. | - | 244 Ko |
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