Effect of Interface Control on Mode I Interlaminar Fracture Toughness of Woven C/C Composite Laminates

概要

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Effects of fiber/matrix interface and matrix microstructure on the mode I interlaminar fracture toughness of C/C composite materials were investigated by coating bismaleimide-triazine co-polymer (BT-resin) on the surface of carbon fiber and changing the heat-treatment temperature (HTT). For the case of laminates with HTT of 1600℃ (carbonized C/C composites), the initial fracture toughness, G_<IC>, was insensitive to BT-resin coating. Moreover, the fracture toughness during crack propagation, G_<IR>, increased by coating BT-resin. On the other hand, both G_<IC> and G_<IR> decreased with BT-resin coating for the laminates with HTT of 2500℃. While both G_<IC> and G_<IR> are insensitive to HTT for laminates without BT-resin coating, they both decreased by increasing HTT for laminates with BT-resin coating. The difference of the effects of interface control and HTT was discussed on the basis of microscopic mechanism consideration. Comparison between in-plane and interlaminar strength indicated the possibility to optimize the interface control.
社団法人日本機械学会の論文
2001-10-15