| 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 |
Detection and Intelligent In-Situ Self-Healing of Damage in Composite Structures |
| Author(s) |
Samit Roy, Abu Horraira Banna, Sameer Mulani |
| On-Site Speaker (Planned) |
Samit Roy |
| Abstract Scope |
Laminated composites are highly susceptible to delamination, and delamination due to fatigue loading is one of the most critical damage modes in composite structures that may lead to catastrophic failure. To investigate delamination detection and self-healing of composites, double cantilever beam (DCB) specimens of carbon fiber-reinforced polymer (IM7/epoxy) composite containing thermoplastic healants and “smart” shape memory polymers (SMP) were manufactured, and Mode-I fatigue delamination experiments were carried out for the virgin case, and seven healing cycles using in-situ macro fiber composite (MFC) sensors. The motivation for using MFCs as sensors for damage detection and as actuators for self-healing via high frequency vibrations is because the same network of MFCs can be used in this dual role, thereby minimizing weight penalty. The reason of using thermoplastic healants- polycaprolactone and shape memory polymer - is to heal the cracks formed during fatigue loading and regain load-carrying capacity of the composite structure. From the fatigue test data for the virgin and healed specimens, Paris law parameters were extracted, and the results obtained from different specimens were found to be repeatable. Furthermore, the delamination crack growth rate retardation factor for the healed specimens was found to be in the range of 14% ~ 24% of that for the virgin specimen, thereby suggesting good healing performance of the specimens under fatigue loading, for up to 7 healing cycles. Having established proof-of-concept using DCB specimens, results are presented for the self-heling of delamination in a composite structural panel with an elliptic hole. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |