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  4. Mode I interlaminar fracture of carbon epoxy laminates: Effects of ply thickness
 
research article

Mode I interlaminar fracture of carbon epoxy laminates: Effects of ply thickness

Frossard, G.
•
Cugnoni, J.  
•
Gmur, T.
Show more
2016
Composites Part A-Applied Science And Manufacturing

In this work, the influence of ply thickness on strain energy release rate (ERR) in delamination of carbon epoxy laminates is addressed. Specimens with three ply thicknesses: 0.030, 0.075 and 0.150 mm are tested. While the ERR at onset of crack propagation is independent of ply thickness, the plateau level is much lower in thin-ply laminates than in thicker ply ones. This effect is attributed to changes in microstructure, caused by the tow spreading process involved in the fabrication of prepregs. Fiber and matrix rich regions observed only in thick ply laminates promote the development of large bundles of bridging fibers which exert large closing forces, leading to higher ERR in thick-ply laminates. Fiber bridging distribution is identified using an iterative procedure from R-curve results, and implemented in cohesive element models. This identification method provides reliable results, as the simulated load-displacement curves are in good agreement with experimental results. (C) 2016 Elsevier Ltd. All rights reserved.

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Type
research article
DOI
10.1016/j.compositesa.2016.09.009
Web of Science ID

WOS:000390745300001

Author(s)
Frossard, G.
Cugnoni, J.  
Gmur, T.
Botsis, J.  
Date Issued

2016

Publisher

Elsevier

Published in
Composites Part A-Applied Science And Manufacturing
Volume

91

Start page

1

End page

8

Subjects

Carbon fibers

•

Delamination

•

Finite element analysis

•

Mechanical testing

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LMAF  
Available on Infoscience
February 17, 2017
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/134613
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