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Heterogeneity of discontinuous carbon fibre composites: damage initiation captured by Digital Image Correlation

Johanson, K.; Harper, L.T.; Johnson, Michael S.; Warrior, N.A.

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Authors

K. Johanson

LEE HARPER LEE.HARPER@NOTTINGHAM.AC.UK
Associate Professor - Composites Manufacturing

Michael S. Johnson

NICHOLAS WARRIOR NICK.WARRIOR@NOTTINGHAM.AC.UK
Professor of Mechanical Engineering & Head of Research Division



Abstract

This paper aims to identify architectural features which lead to damage initiation and failure in discontinuous carbon fibre composites formed from randomly orientated bundles. A novel multi-camera digital image correlation system was used to simultaneously view strain fields from opposing surfaces of coupons, in order to map progression of failure.
The highest strain concentrations were found to occur when the ends of fibre bundles aligned in the direction of loading coincided with underlying transverse bundles. The failure plane was observed to grow between a number of strain concentrations at critical features, coalescing sites of damage to create the final fracture surface. Although potential failure sites can be detected at low global strains in the form of strain concentrations, the strain field observed at low applied loads cannot be extrapolated to reliably predict final failure.

Citation

Johanson, K., Harper, L., Johnson, M. S., & Warrior, N. (2015). Heterogeneity of discontinuous carbon fibre composites: damage initiation captured by Digital Image Correlation. Composites Part A: Applied Science and Manufacturing, 68, https://doi.org/10.1016/j.compositesa.2014.10.014

Journal Article Type Article
Acceptance Date Oct 12, 2014
Online Publication Date Oct 18, 2014
Publication Date Jan 31, 2015
Deposit Date Aug 3, 2017
Publicly Available Date Aug 3, 2017
Journal Composites Part A: Applied Science and Manufacturing
Print ISSN 1359-835X
Electronic ISSN 1878-5840
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 68
DOI https://doi.org/10.1016/j.compositesa.2014.10.014
Keywords Discontinuous reinforcement, Preform, Stress concentrations, Damage initiation
Public URL https://nottingham-repository.worktribe.com/output/742058
Publisher URL http://www.sciencedirect.com/science/article/pii/S1359835X14003261
Contract Date Aug 3, 2017

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