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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.

Authors

K. Johanson

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

Michael S. Johnson eazmj@exmail.nottingham.ac.uk

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.

Journal Article Type Article
Publication Date Jan 31, 2015
Journal Composites Part A: Applied Science and Manufacturing
Print ISSN 1359-835X
Electronic ISSN 1359-835X
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 68
APA6 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
DOI https://doi.org/10.1016/j.compositesa.2014.10.014
Keywords Discontinuous reinforcement, Preform, Stress concentrations, Damage initiation
Publisher URL http://www.sciencedirect.com/science/article/pii/S1359835X14003261
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0





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