Journal
JOURNAL OF COMPOSITE MATERIALS
Volume 51, Issue 18, Pages 2585-2595Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/0021998316673892
Keywords
Microwave curing; carbon fiber; polymer-matrix composites; interlaminar fracture toughness; interface
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Funding
- National Natural Science Foundation of China [51575275, 51305195]
- Outstanding Talents Cultivation Fund'' [NE2012003]
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Carbon fiber-reinforced polymer composites have been widely used in the aerospace industry. However, they are extremely sensitive to crack initiation, propagation and interlaminar delamination which severely reduce their service life. This paper demonstrated that the Mode-I interlaminar fracture toughness could be significantly improved in carbon fiber/bismaleimide composites using a microwave curing process. An increase of about 53.5% in critical load and an increase of approximately 133.5% and 61.2% in fracture toughness and fracture resistance have been achieved, respectively. The microwave manufacturing cycle for composites was cut to 44% of the thermal processing cycle. Dynamic mechanical thermal analysis was performed to investigate the enhanced interfacial strength in microwave-cured composites. The improvement in fracture toughness was attributed to a better interfacial adhesion between resin and fiber, which was investigated by the observation of fracture surfaces with optical microscopes.
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