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Characterization of melded carbon fibre/epoxy laminates

journal contribution
posted on 2007-08-01, 00:00 authored by Timothy Corbett, Mark Forrest, P Le Gac, Bronwyn Fox
‘Melding’ is a novel in situ method for joining thermosetting composite structures, without the need of adhesives. Laminate joining is achieved using uncrosslinked resin matrix of the pre-preg. This study used Hexply914C pre-preg material to characterize melded CFRP structures produced using the melding method. A designated area of a laminate was maintained at temperatures below 40 °C retaining uncured (B-staged) material, while the remainder of the laminate was cured at 175 °C. After a 2.5 h cure cycle, the cured region showed a high degree of cure (0.88) and glass transition temperature (176 °C). The uncured area of the same laminate was cured in a second stage, simulating an in situ melded joint. By controlling the temperature and duration of the intermediate dwell and affecting minimum viscosity values prior to final cure, low values of porosity (<0.5%) were achieved. The mechanical properties of the resulting joint were consistent throughout the melded laminate. Flexural strength (1600 MPa), flexural modulus (100–105 MPa) and short beam strength (105–115 MPa) values observed where equivalent or greater than those found in the recommended autoclave cured control specimens. After the entire laminate was post cured, glass transition temperatures of 230 °C (peak tan δ) were observed in all areas of the laminate.

History

Journal

Composites. Part A, Applied science and manufacturing

Volume

38

Issue

8

Pagination

1860 - 1871

Publisher

Pergamon

Location

United Kingdom

ISSN

1359-835X

eISSN

1878-5840

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2007, Elsevier Ltd.