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The influence of temperature and moisture on the mode I fracture toughness and associated fracture morphology of a highly toughened aerospace CFRP

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Title: The influence of temperature and moisture on the mode I fracture toughness and associated fracture morphology of a highly toughened aerospace CFRP
Authors: Katafiasz, T
Greenhalgh, ES
Allegri, G
Pinho, ST
Robinson, P
Item Type: Journal Article
Abstract: This paper addresses the characterisation of the mode I interlaminar fracture toughness of a carbon fibre/epoxy composite material, toughened with thermoplastic particles in the ply interlayers. The characterisation is undertaken at −55 °C, 19 °C, and 90 °C, on both dry and fully moisture saturated coupons. Fractographic observations of the delamination surfaces allows identification of the failure mechanisms. The mode I propagation fracture toughness tested at wet/90 °C exhibits a 176% increase compared to the dry/19 °C specimens, due to enhanced plastic deformation of the interlayers and more prominent fibre bridging. Moisture-saturated coupons tested at −55 °C suffered a 57% reduction of mode I fracture toughness compared to those under dry/19 °C conditions. This is due to the dis-bond and consequent plucking of the thermoplastic particles from the surrounding matrix. This observation points to the fact that wet/cold conditions may represent the worst-case scenario for the interlaminar fracture performance of composite systems toughened with thermoplastic interleaves.
Issue Date: 1-Mar-2021
Date of Acceptance: 4-Dec-2020
URI: http://hdl.handle.net/10044/1/86134
DOI: 10.1016/j.compositesa.2020.106241
ISSN: 1359-835X
Publisher: Elsevier
Journal / Book Title: Composites Part A: Applied Science and Manufacturing
Volume: 142
Copyright Statement: © 2020 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor/Funder: Innovate UK
Innovate UK
Funder's Grant Number: 113085
113190
113085
17017 - 113190
Keywords: Materials
0901 Aerospace Engineering
0912 Materials Engineering
0913 Mechanical Engineering
Publication Status: Published
Article Number: ARTN 106241
Online Publication Date: 2020-12-14
Appears in Collections:Aeronautics



This item is licensed under a Creative Commons License Creative Commons