JCOMA
3385
S1359-835X(13)00117-6
10.1016/j.compositesa.2013.04.006
The Authors
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This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Demonstration of pseudo-ductility in high performance glass/epoxy composites by hybridisation with thin-ply carbon prepreg
Gergely
Czél
⁎
G.Czel@bristol.ac.uk
M.R.
Wisnom
Advanced Composites Centre for Innovation and Science, University of Bristol, United Kingdom
Advanced Composites Centre for Innovation and Science
University of Bristol
United Kingdom
⁎
Corresponding author. Address: University of Bristol, Queen’s Building, Bristol BS8 1TR, United Kingdom. Tel.: +44 (0) 117 33 15311; fax: +44 (0) 117 95 45360.
Abstract
A new approach and material architecture is presented in order to overcome the inherent brittleness and unstable failure characteristic of conventional high performance composites. The concept is the use of thin-ply hybrid laminates. Fracture mechanics calculations were carried out to determine the critical carbon layer thickness for stable pull-out in a three layer unidirectional hybrid laminate, which can provide a pseudo-ductile failure. Unidirectional hybrid composites were fabricated by sandwiching various numbers of thin carbon prepreg plies between standard thickness glass prepreg plies and tested in tension. Specimens with one and two plies of thin carbon prepreg produced pseudo-ductile failure, whereas ones with three and four plies failed with unstable delamination. An explanation of the different failure modes is given in terms of the different energy release rates for delamination in various specimens. The observed damage characteristics agreed well with the expectations according to the estimated critical carbon layer thickness.
Keywords
A. Carbon fibre
A. Glass fibres
B. Delamination
Hybrid
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2013-09-13T19:32:51
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10.1016/j.compositesa.2013.04.006
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