Characterization and analysis of the mode I interlaminar fatigue behaviour of thermoplastic composites considering R-curve effects

Characterization and analysis of the mode I interlaminar fatigue behaviour of thermoplastic composites considering R-curve effects

Leciñana, I. (Basque Research and Technology Alliance (BRTA); University of Girona)
Renart, J. (University of Girona)
Turon, A. (University of Girona)
Zurbitu, J. (Basque Research and Technology Alliance (BRTA))
Tijs, B.H.A.H. (TU Delft Aerospace Structures & Computational Mechanics; Fokker/GKN Aerospace)

2023

Through the application of innovative production processes, thermoplastic composites might help the aviation industry become more sustainable. However, there is currently not much experimental understanding on the fatigue behaviour, and validated analysis methodologies on thermoplastic composites are rather limited. In this work, the fatigue onset and propagation interlaminar properties of AS4D/PEKK-FC thermoplastic composite were characterized under mode I loading. Testing costs were reduced by using a multi-fatigue testing rig that allows loading 6 specimens at the same time. The offset in the fatigue crack growth rate curves tested at different severities was explained by the fatigue R-curve effects. The offset was modelled by means of superposed fatigue cohesive laws. Different approaches on how to consider fatigue damage were compared with experimental data, giving an insight on how fatigue damage evolves, and developing a novel modelling strategy based on a robust method for fatigue model parameter identification for fatigue delamination when several failure mechanisms interact.

Fatigue characterization
Fatigue cohesive zone model
Fibre bridging
Resistance curve

http://resolver.tudelft.nl/uuid:125fb82c-b63a-4565-8134-fc3c192a731e

https://doi.org/10.1016/j.engfracmech.2023.109273

0013-7944

Engineering Fracture Mechanics, 286

Institutional Repository

journal article

© 2023 I. Leciñana, J. Renart, A. Turon, J. Zurbitu, B.H.A.H. Tijs