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

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

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)
26 Downloads (Pure)

Abstract

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.

Original languageEnglish
Article number109273
JournalEngineering Fracture Mechanics
Volume286
DOIs
Publication statusPublished - 2023

Keywords

  • Fatigue characterization
  • Fatigue cohesive zone model
  • Fibre bridging
  • Resistance curve

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