Table of Contents
Journal of Composites
Volume 2013, Article ID 695862, 7 pages
Research Article

Internal-Notched Flexure Test for Measurement of Mode II Delamination Resistance of Fibre-Reinforced Polymers

1Department of Mechanical Engineering, University of Alberta, Edmonton, AB, Canada T6G 2G8
2Department of Civil & Environmental Engineering, University of Alberta, Edmonton, AB, Canada T6G 2G7

Received 8 July 2013; Accepted 21 November 2013

Academic Editor: Baozhong Sun

Copyright © 2013 Chengye Fan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper introduces a new test, method, named internal-notched flexure (INF) test, that is designed to measure the critical energy release rate of fibre-reinforced polymers for delamination growth in shear mode (mode II). The INF test generates stable delamination growth, with a monotonic increase of load and displacement in a nearly linear fashion. Values of the mode II delamination toughness were deduced using experimental compliance fitting method. Good repeatability of the results was obtained. Compared with the end-notched flexure (ENF) test using the same material, the INF test yielded higher delamination resistance, possibly due to the bridging fibres found between fracture surfaces of the INF test specimens.