Hygrothermal ageing effects on mode I fatigue delamination in multidirectional composite laminates

Journal Article (2024)
Authors

Liaojun Yao (Harbin Institute of Technology, Structural Integrity & Composites)

Zixian He (Harbin Institute of Technology)

Yonglyu He (National University of Defense Technology)

Qifeng Jin (National University of Defense Technology)

S. V. Lomov (Katholieke Universiteit Leuven)

René Alderiesten (TU Delft - Group Alderliesten)

Research Group
Group Alderliesten
More Info
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Publication Year
2024
Language
English
Research Group
Group Alderliesten
Bibliographical Note
Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. @en
Volume number
188
DOI:
https://doi.org/10.1016/j.ijfatigue.2024.108520
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Abstract

Ageing is known to have significantly detrimental effect on mode I fatigue delamination growth (FDG) in unidirectional (UD) composite laminates. However, composite structures are usually designed with multidirectional (MD) layups, which raises the question that is it enough to only conducted fatigue delamination experiments on specimens with a UD layup. The aim of this study is therefore to explore mode I FDG in MD composite laminates with 45//45 interface after different ageing, i.e. at 70 °C 85 % relative humidity (RH) and immersion in 70 °C water bath. Fatigue delamination experiments were conducted at stress ratios R = 0.1 and 0.5. The fatigue data, interpreted via Paris-type fatigue laws, demonstrated that: (1) the change of ageing severity has no influence on mode I FDG in MD composite laminates; (2) FDG remains the same in composite laminates after different ageing, regardless of layups. In all cases, the same master resistance curves can be obtained to determine the intrinsic mode I fatigue delamination resistance of UD and MD composite laminates after different ageing. The physical reasons for these findings were discussed based on the moisture content analysis, Fourier transform infrared (FTIR) analysis, dynamic mechanical thermal analysis (DMTA), and fractographic examinations. It was found that material degradation and delamination mechanisms remain the same for UD and MD layups, as well as for 85 %RH and water bath conditioning.

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