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
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.
|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|