| 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 |
Improved Deposition Rates in Additive Manufacturing of Commingled Tow-Based Continuous Fiber-Reinforced Composites via Alternating Tow Positioning |
| Author(s) |
Rashedul Islam, Donald W Radford |
| On-Site Speaker (Planned) |
Rashedul Islam |
| Abstract Scope |
3D printing technology using continuous fiber-reinforced commingled tow holds the potential to enable the fabrication of continuous fiber-reinforced high-volume fraction composite structures suitable for a wide range of high-performance applications, while radically reducing the required tooling. Although improvements in mechanical performance can be achieved through modifications in feedstock materials, process parameters, and postprocessing, there are trade-offs in terms of manufacturability. A balance between optimized process parameters, including temperature, consolidation pressure, and speed versus improved tow positioning to enhance fiber orientation and packing, is crucial to producing high-quality composites. In this study, two different tow-layering strategies are considered for depositing E-glass/PETG com-mingled tow onto the tool to manufacture high-quality unidirectional composite beams. A custom gantry-style continuous fiber extrusion system is employed. After each deposition pass in the X-direction tow paths are stepped 3mm in the Y-direction until the first layer is complete. For each following layer, the path of the nozzle has an offset of 1.50 mm in the Y-direction to position it between two tows in the previous layer. The volume fraction of the constituent material and microscopy reveal an increased constituent volume fraction and an improved fiber distribution compared to stacking tows in each layer directly above those of the previous layer. Tests utilizing Dynamic Mechanical Analysis demonstrate that the alternating tow method achieves com-parable composite quality at a higher manufacturing rate compared to conventional layer-on-layer tow stacking demonstrating that material deposition rates can be affected by tow stacking position in addition to changes in pro-cessing parameters. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |