Improving interlaminar fracture toughness of carbon fibre/epoxy laminates by incorporation of nano-particles |
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Authors: | Ying ZengHong-Yuan Liu Yiu-Wing MaiXu-Sheng Du |
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Affiliation: | Centre for Advanced Materials Technology (CAMT), School of Aerospace, Mechanical & Mechatronic Engineering J07, The University of Sydney, Sydney, NSW 2006, Australia |
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Abstract: | Double-cantilever-beam tests were applied to investigate the mode I interlaminar fracture toughness of carbon fibre/epoxy laminates, in which the epoxy matrices were incorporated with rubber and silica nano-particles, either singly or jointly. It is shown that the toughness is improved owing to the presence of these nano-particles although nano-rubber is more effective than nano-silica. Further, by keeping the total particle weight percentage constant in epoxies (e.g., at 8 and 12 wt.%) filled with equal amount of nano-silica and nano-rubber, the interlaminar toughness values of the hybrid laminates are always higher than those with nano-silica filled epoxies but lower than those with nano-rubber filled matrices. Scanning electron microscopy examination of the delaminated surfaces of composite laminates filled with nano-particles revealed that cavitation of nano-rubber particles/void growth and debonding of nano-silica from epoxy matrix are responsible for the improved interlaminar toughness observed. It is also shown that the bulk toughness of nano-particle filled epoxies cannot be fully transferred to the interlaminar toughness of composite laminates, being limited by the constraint effect imposed by the carbon fibres. Finally, the role of fibre-bridging on the delaminated crack and hence delamination toughness is discussed. |
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Keywords: | B Mode I delamination A Carbon fibre composite A Silica nano-particles A Rubber nano-particles |
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