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 |
Fracturing Behavior and Scaling of Additively Manufactured Continuous Fiber Composites |
Author(s) |
Marco Salviato, Sean Phenisee, Antonio Deleo, Daniele Pelessone, Mark Flores |
On-Site Speaker (Planned) |
Marco Salviato |
Abstract Scope |
The proper adoption of Additive Manufacturing (AM) of continuous fiber composites requires a deep understanding of their inherent damage and fracturing mechanisms and the structural size effect which they inevitably introduce.
This work presents an experimental and numerical investigation of the fracture behavior and scaling of IM7-977-3 additively manufactured continuous fiber composites. Towards this goal, traditional and AM geometrically scaled Single Edge Notch Tension (SENT) samples were tested and simulated to compare the different damaging and fracturing behavior and how the nominal strength scales with the structure size. The results show that, due to the inherent defects coming from the manufacturing process, AM composites are generally more prone to damage at low stress levels compared to traditionally manufactured composites. However, such damage does not localize hence redistributing the stress throughout the structure and reducing stress concentrations and notch sensitivity. This resulted in a more “pseudo-ductile” behavior of AM composites compared to traditional laminates for a given structure size and larger work of fracture.
The experimental and numerical results show that, while AM composites generally can exhibit preexisting damage and are more prone to develop microcracks, they are also significantly more damage tolerant than traditional composites. This is an aspect which will need to be seriously taken into consideration for the development of qualification and certification guidelines. It appears clear from the test results that traditional qualification guidelines would be excessively conservative for AM composites. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |