Interlocking thin-ply reinforcement concept for improved fracture toughness and damage tolerance

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Title: Interlocking thin-ply reinforcement concept for improved fracture toughness and damage tolerance
Authors: Pascoe, J-A
Pimenta, S
Pinho, ST
Item Type: Journal Article
Abstract: An original concept for improving the delamination resistance and damage tolerance of a composite laminate is proposed. The concept is to insert interlocked thin-ply reinforcement units between the laminae. Each reinforcement unit consists of two thin-ply layers with tabs cut into one layer, and slits cut into the other layer. The slits, and the long axis of the tabs, are parallel to the fibre direction in their respective layers. The two thin-ply layers are placed together, and the tabs are inserted through the slits, creating an interlocked reinforcement unit. The effect of the reinforcement units was quantified via mode I (DCB) and mode II (4ENF) fracture toughness tests, as well as compression after impact tests. Mode I propagation fracture toughness was increased by 77.6%, while mode II fracture toughness was not affected. In the compression after impact tests, an 11.4% reduction in delamination area was achieved but this only resulted in a 5.1% increase in CAI strength.
Issue Date: 8-Sep-2019
Date of Acceptance: 9-Jun-2019
ISSN: 0266-3538
Publisher: Elsevier
Journal / Book Title: Composites Science and Technology
Volume: 181
Copyright Statement: © 2019 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Royal Academy of Engineering
Funder's Grant Number: EP/M002500/1
Keywords: Materials
09 Engineering
Publication Status: Published
Embargo Date: 2020-06-19
Article Number: 107681
Online Publication Date: 2019-06-19
Appears in Collections:Faculty of Engineering

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