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Development of a novel compact tension specimen to mitigate premature compression and buckling failure modes within fibre hybrid epoxy composites

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Title: Development of a novel compact tension specimen to mitigate premature compression and buckling failure modes within fibre hybrid epoxy composites
Authors: Katafiasz, TJ
Iannucci, L
Greenhalgh, E
Item Type: Journal Article
Abstract: A Notched Curved Compact Tension (NCCT) and Extended Notched Curved Compact Tension (ENCCT) specimen geometry are presented for the measurement of translaminar critical strain energy release rates in composite laminates with low compressive to tensile strengths. Premature compressive and buckling failure occurred when a conventional Compact Tension (CT) specimen geometry (similar to ASTM E399 [1]) was utilised for monolithic Non-Crimp Fabric (NCF) S2-Glass / MTM57 epoxy and an interlayer fibre hybrid T700 carbon spread tow / NCF S2-glass epoxy composite. The NCCT and ENCCT specimen design methodology and manufacturing routes are presented where premature compressive failure was mitigated through a curvature at the rear of the profile and the introduction of a through-thickness groove that had been pre-cured along the crack growth region. The latter ensured that buckling was eliminated, whilst stable crack growth was achieved. The development involved FE model material validation and optimisation for the novel specimen design. Experimental tests presented both interlayer and intralayer fibre hybrid composites with good repeatability and low scatter within the results.
Issue Date: 1-Jan-2019
Date of Acceptance: 15-Jun-2018
URI: http://hdl.handle.net/10044/1/61502
DOI: https://dx.doi.org/10.1016/j.compstruct.2018.06.124
ISSN: 1879-1085
Publisher: Elsevier
Start Page: 93
End Page: 107
Journal / Book Title: Composite Structures
Volume: 207
Copyright Statement: © 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/).
Sponsor/Funder: Technology Strategy Board
Funder's Grant Number: P43949
Keywords: Science & Technology
Technology
Materials Science, Composites
Materials Science
Buckling
Translaminar
Mode I
Finite element
Design
Fracture
TRANSLAMINAR FRACTURE-TOUGHNESS
DAMAGE MECHANICS APPROACH
THIN-PLY COMPOSITES
PART II
MODELING IMPACT
Materials
09 Engineering
Publication Status: Published
Online Publication Date: 2018-09-06
Appears in Collections:Aeronautics
Faculty of Engineering