An Enhanced Vacuum Cure Technique for On-Aircraft Repair of Carbon-Bismaleimide Composites |
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| Authors: | Andrew N. Rider Alan A. Baker Chun H. Wang Graeme Smith |
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| Affiliation: | (1) Defence Science and Technology Organisation, Fisherman’s Bend, PO Box 4331, Victoria, 3001, Australia;(2) Cooperative Research Centre for Advanced Composite Structures Ltd., Fisherman’s Bend, Victoria, Australia;(3) Present address: School of Aerospace, Mechanical and Manufacturing Engineering, RMIT University, GPO Box 2476V, Melbourne, VIC, 3001, Australia |
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| Abstract: | Carbon/bismaleimide (BMI) composite is increasingly employed in critical load carrying aircraft structures designed to operate at temperatures approaching 180°C. The high post-cure temperature (above 220°C) required to fully react the BMI resin, however, renders existing on-aircraft prepreg or wet layup repair methods invalid. This paper presents a new on-aircraft repair technique for carbon/BMI composites. The composite prepregs are first warm-staged to improve the ability to evacuate entrapped air. Then the patch is cured in the scarf cavity using the vacuum bag technique, followed by off-aircraft post-cure. The fully cured patch then can be bonded using a structural adhesive. |
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