White Rose University Consortium logo
University of Leeds logo University of Sheffield logo York University logo

The role of matrix cracks and fibre/matrix debonding on the stress transfer between fibre and matrix in a single fibre fragmentation test

Johnson, A.C., Hayes, S.A. and Jones, F.R. (2012) The role of matrix cracks and fibre/matrix debonding on the stress transfer between fibre and matrix in a single fibre fragmentation test. Composites Part A Applied Science and Manufacturing, 43 (1). pp. 65-72. ISSN 1359-835X

Full text available as:
[img]
Preview
Text
WRRO_43690.pdf

Download (187Kb)

Abstract

The single fibre fragmentation test is commonly used to characterise the fibre/matrix interface. During fragmentation, the stored energy is released resulting in matrix cracking and/or fibre/matrix debonding.

Axisymmetric finite element models were formulated to study the impact of matrix cracks and fibre/matrix debonding on the effective stress transfer efficiency (EST) and stress transfer length (STL). At high strains, plastic deformation in the matrix dominated the stress transfer mechanism. The combination of matrix cracking and plasticity reduced the EST and increased STL.

For experimental validation, three resins were formulated and the fragmentation of an unsized and uncoupled E-glass fibre examined as a function of matrix properties. Fibre failure was always accompanied by matrix cracking and debonding. With the stiff resin, debonding, transverse matrix cracking and conical crack initiation were observed. With a lower modulus and lower yield strength resin the transverse matrix crack length decreased while that of the conical crack increased. (C) 2011 Elsevier Ltd. All rights reserved.

Item Type: Article
Copyright, Publisher and Additional Information: © 2012 Elsevier. This is an author produced version of a paper subsequently published in Composites Part A. Uploaded in accordance with the publisher's self-archiving policy.
Keywords: Fibre/matrix bond; Fragmentation; Stress transfer; Finite element analysis
Institution: The University of Sheffield
Academic Units: The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield)
Depositing User: Miss Anthea Tucker
Date Deposited: 30 Jan 2012 14:29
Last Modified: 08 Feb 2013 17:36
Published Version: http://dx.doi.org/10.1016/j.compositesa.2011.09.00...
Status: Published
Publisher: Elsevier
Refereed: Yes
Identification Number: 10.1016/j.compositesa.2011.09.005
URI: http://eprints.whiterose.ac.uk/id/eprint/43690

Actions (repository staff only: login required)