| 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 |
Abrasive Friction Drilling in Fiber Reinforced Thermosetting Polymer Composites |
| Author(s) |
Shawn Hogh, Austin MacGowan, Brittany Fromlath, Adrian Rivera, Nathan Machak, Mark Smeets, Satchi Venkataraman, Margherita Capriotti, Daniel C. Hammerand |
| On-Site Speaker (Planned) |
Shawn Hogh |
| Abstract Scope |
Conventional drilling in carbon fiber reinforced polymer (CFRP) composites uses drilling bits optimized for composite drilling to minimize damage to composite laminates. The dominant modes of composite damage at drilled hole site include the following: ply push-out at laminate exit, ply pull-up at laminate entry, fiber pull-out damage at hole surfaces, delaminations surrounding the holes, as well as hole surface and size irregularities. The brittle nature of thermosetting polymers and toughness of carbon fibers make them suitable for abrasive cutting methods including that using diamond blade saws and waterjet cutting. Besides demonstrating abrasive hole drilling in composites using core saw drill tools, this paper presents abrasive hole-drilling for composites using abrasive coated conical bits. The work is an exploratory step in the development of a hybrid abrasive drilling and friction-drilling bit for friction-drilled fasteners for composite/metals stacks. Polymer-bonded abrasive drill bits were designed, fabricated and tested for this purpose. The effect of process parameters (e.g., feed rate, spindle speed (rpm), cooling applied during cutting) and cutting tool characteristics (e.g., drill bit surface roughness/abrasive grit size) on hole quality, mechanical and thermal damage observed, magnitude of cutting forces (e.g., torque and thrust forces) are quantified and compared against that for conventional drill bits, sintered diamond abrasive coated bits, and polymer bonded diamond abrasive bits. Results show it is possible to achieve high quality drilled holes in CFRP laminates using abrasive drilling under optimized process settings and under provision of sufficient cooling to minimize thermal damage and debris removal from the drilling site. Bearing tests of specimens drilling using conventional and friction drill bits are also compared. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |