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Experimental investigation of randomly-oriented tow-based discontinuous composites and their equivalent laminates

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Title: Experimental investigation of randomly-oriented tow-based discontinuous composites and their equivalent laminates
Authors: Li, Y
Pimenta, S
Singgih, J
Nothdurfter, S
Schuffenhauer, K
Item Type: Journal Article
Abstract: The equivalent laminate assumption is a commonly-used method to model the random architecture of discontinuous composites, but which has never been validated experimentally. This study aims to verify the equivalent laminate assumption, focusing on tow-based discontinuous composites (TBDCs), which have higher fibre-content and thus improved modulus and strength, compared to conventional discontinuous-fibre composites. This verification was achieved by manufacturing and testing (i) actual TBDCs with randomly oriented tows and (ii) their equivalent laminates (ELs), at two different tow thicknesses. The results show that ELs exhibit the same failure mechanisms as TBDCs, and are similarly weakened by an increase in tow thickness. However, ELs lack the spatial variability in local fibre-content and local tow orientations, which makes ELs stronger than TBDCs. Therefore, the equivalent laminate assumption is suitable for predicting the modulus of discontinuous composites, but cannot predict their strength without considering the local variability in their microstructure.
Issue Date: 1-Nov-2017
Date of Acceptance: 25-Jun-2017
URI: http://hdl.handle.net/10044/1/53786
DOI: 10.1016/j.compositesa.2017.06.031
ISSN: 1359-835X
Publisher: Elsevier
Start Page: 64
End Page: 75
Journal / Book Title: Composites Part A: Applied Science and Manufacturing
Volume: 102
Issue: 1
Copyright Statement: © 2017, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor/Funder: Royal Academy of Engineering
Automobili Lamborghini S.p.A.
Funder's Grant Number: RF/133
Keywords: Science & Technology
Engineering, Manufacturing
Materials Science, Composites
Materials Science
Discontinuous reinforcement
Mechanical properties
Laminate mechanics
Microstructural analysis
0901 Aerospace Engineering
0912 Materials Engineering
0913 Mechanical Engineering
Publication Status: Published
Online Publication Date: 2017-07-14
Appears in Collections:Mechanical Engineering
Faculty of Engineering