| 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 |
Characterization of Low-Velocity Impact Damage in Toughened Non-Crimp Fabric Laminates |
| Author(s) |
Wade Jackson, Cheryl Rose, Frank Leone, Michael Horne |
| On-Site Speaker (Planned) |
Wade Jackson |
| Abstract Scope |
Resin-infused composites are being investigated for rapid manufacturing of composite aircraft. These materials are typically composed of non-crimp fabrics containing 0°, +/−45°, and 90° plies and have the potential for improved manufacturing costs and rates relative to thermoset composites. Initial testing has shown differences in the damage response of these composites as compared to state-of-the-art thermoset materials. Consequently, the accuracy of existing damage analysis tools for these materials must be assessed. Impact damage in a quasi-isotropic laminate is a challenging case for numerical model evaluation since damage typically is composed of a “rotating-fan” of delaminations bounded by matrix cracks and often contains fiber fractures. A series of low-velocity impact tests was conducted over a range of impact energies to evaluate the damage response. Impact specimens had a 24-ply quasi-isotropic layup and were clamped in a picture frame support with a 5-inch-square unsupported region. To further investigate the damage process, quasi-static indentation (QSI) tests were conducted while monitoring acoustic emissions to guide incremental loading. Following each impact and QSI test, internal damage was evaluated using a combination of pulse-echo ultrasonic testing and X-ray computed tomography. Detailed damage maps were created from these data sets showing matrix cracking, delamination, and fiber breaks for each interface and layer. The damage maps will allow for future comparisons to existing analysis tool predictions to determine if the tools need further development to more accurately predict damage in high-rate resin-infused composites. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |