Fatigue delamination behaviour of carbon fibre/epoxy composites interleaved with thermoplastic veils

Journal article (2021)

Authors

Dong Quan Shandong University
Neal Murphy University College Dublin
Alojz Ivanković University College Dublin
Guoqun Zhao Shandong University
R.C. Alderliesten Structural Integrity & Composites - Aerospace Engineering
Research Group
Structural Integrity & Composites (Aerospace Engineering) (TU Delft)
Copyright: © 2021 Dong Quan, Neal Murphy, Alojz Ivanković, Guoqun Zhao, R.C. Alderliesten
DOI
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https://doi.org/10.1016/j.compstruct.2021.114903
Toughening mechanism Fatigue delamination Interlay toughening Thermoplastic fibres
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Published Date

2021

Language

English

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Faculty

Aerospace Engineering

Department

Aerospace Structures & Materials

Research Group

Structural Integrity & Composites

Abstract

Interleaving thermoplastic veils has proved to enhance the interlaminar fracture toughness of carbon fibre/epoxy composites under static loading conditions. However, the fatigue delamination behaviour has yet to be investigated. Herein, meltable Polyamide-12 (PA) veils and non-meltable Polyphenylene-sulphide (PPS) veils were used for interlay toughening of unidirectional (UD) and non-crimp fabric (NCF) laminates that were manufactured using a prepreg process and resin transfer moulding process, respectively. The results of Mode-I fatigue delamination tests demonstrated a significant improvement in the fatigue life of the laminates due to interleaving. Additionally, the fatigue resistance energy has been maximumly increased by 143% and 190% for the UD and NCF laminates, respectively. The microscopy analysis revealed that the toughening mechanisms of thermoplastic veils were affected by the form of the thermoplastic veils in the laminates (melted or non-melted), the fracture mechanisms of the reference laminates and the adhesion/miscibility between the thermoplastic veils and the epoxy.

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