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 |
Effect of Polymeric Nanofibrous Veils on Co-Cured Joint Strength |
Author(s) |
Abdul Bari Abdul Raheman, Christoph Schaal, Satchi Venkataraman, Kaan Bilge, Melih Papila |
On-Site Speaker (Planned) |
Melih Papila |
Abstract Scope |
Electrospun polymeric nanofiber veils can be deposited onto conventional composite materials. They are porous and typically have a fiber diameter of less than 500 nm. During the composite curing process, resin infuses into the high-surface area veils, forming thin nanofiber-reinforced epoxy nanocomposite interlayers in-situ. The nanofibrous network preserved within these nanocomposite interlayers increases the energy required to initiate and propagate microcracks and delamination between adjacent structural composite plies. Nonwoven nanofiber mats can also be effective when incorporated only at locations prone to damage initiation.
The objective of this study is to further explore the tailored use of nanofiber nonwoven veils for strengthening weaker spots in composite structures such as joints. A single layer of nanofiber veil can be introduced to enhance strength at the joint area without a weight penalty. First, co-cured single lap joint specimens of carbon fiber/epoxy adherent configurations will be prepared with and without PA66 nanofibrous veils. Configurations of different lap joint areas and unsupported adherent lengths will be explored to investigate the effect of joint rotation leading to different peel/shear stress balances at failure. Finally, co-cured T-stiffened panel segments, where the weaker spot is arguably the skin/stiffener bonding, will be tested under flexural loading. The T-stiffened specimens will be examined using guided wave-based ultrasound methods prior to destructive testing. The study hypothesizes that wave features measured across the stiffener via pitch-catch ultrasound correlate with bond quality. It will compare transmission coefficients and nonlinear effects, like higher harmonic generation, across samples to investigate this correlation. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |