| 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 |
Stack Drilling of Carbon Fiber Reinforced Polymer Laminate and Metals Stacks Using Friction Flow Drilling |
| Author(s) |
Daniel C. Hammerand, Sergio Saab Gonzalez, Akim Rayskiy, Edward Jeon, Austin MacGowan, Shawn Hogh, Satchi Venkataraman |
| On-Site Speaker (Planned) |
Daniel C. Hammerand |
| Abstract Scope |
Friction drilling in metals has been shown to provide serval advantages over conventional hole drilling processes. For example, the formation of a bushing and collar by plastic flow of metal during the friction drilling increases the bearing strength of the joint. Our work reports the results from an exploratory experimental study conducted to evaluate the feasibility of a friction drilling to attach a composite laminate to a metal substrate. This was motivated by the desire for using friction drilling for temporary infield repairs of metal aircraft with mechanically fastened doublers. Since friction-drilling methods are not useable with thermosetting polymer composites, the composite laminates need to have predrilled holes. The full formation of bushing and collar in friction drilling requires optimization of the hole clearance and drill process parameters including feed rate and spindle speed. One of the challenges of this approach is that the optimization process parameters to achieve desired plastic flow of metal has adverse effects on the composite due to the collateral heat damage. Using cooling is not an option in such friction drilling as the friction drilling relies on the heating to achieve the plastic flow for creating the hole. However, through proper selection of initial clearance and process parameters, this heat damage can be minimized. This paper presents results of friction drilling of composite metal stacks and effect of process parameters of formation of bushing and collar around the hole and observed damage from the friction drilling process. It also discusses the challenges that need to be overcome to achieve reliable friction drilling process for joining composite/metal stacks. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |