About this Abstract |
Meeting |
2024 ASC Technical Conference, US-Japan Joint Symposium, D30 Meeting
|
Symposium
|
2024 ASC Technical Conference, US-Japan Joint Symposium, D30 Meeting
|
Presentation Title |
Mode II delamination response of nanofiber interlayered filament wound CFRP laminates under cryogenic conditions |
Author(s) |
Kaan Bilge, Recep Ufuk, Baris Emre Kiral, Melih Papila, Arif Karabeyoglu |
On-Site Speaker (Planned) |
Kaan Bilge |
Abstract Scope |
This work aims to asses the potential of commercially available PA 6,6 nanofibrous mats when incorporated to large scale filament winding process. Conventional wet winding process was employed on a specially designed flat mandrel to manufacture uni-directional composite laminates. A49-12K carbon fibers were used as reinforcement and cryogenic-compatible CTD 7.1 epoxy resin was employed as the resin phase.The overall winding process was stopped on the mid-plane to introduce a pre-crack (via 12um non-adherent film) and PA 6,6 nanofibers of 3g/m^2 aerial weight. Laminate curing was performed in an autoclave oven for 3 hours at 80oC. Obtained laminates were then cut into end notched flexure (ENF) test samples as designated in ASTM D7905/D7905M-19. ENF tests were performed in room temperature and under cryogenic conditions. Obtained results suggested that mode II strain energy (GIIc) of interlayered laminates were 35% higher than the one of neat laminates when tested under room temperatures. Contrarily toughening methodology seemed to reduce GIIc by 40% under cryogenic conditions. Performed fractographic analysis suggested that the imporvement under RT was primarily due to i) reduction of the tow-undulation effect inherent to wet winding ii) effective resin toughening and crack deflection mechanisms. On the other hand the reduction in G2c was due to fiber/matrix debonding due to interface cracking and interlayer failure events. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |