Composite Panel Joining with Reversible Tab-and-Slot Locking
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Solution Overview
Problem
The assembly of composite panels in aircraft interiors using adhesives is challenging due to the exposure of core material cell structures at panel edges, making adhesive application difficult, and the inability to disassemble once bonded, which complicates repair and access to obscured areas.
Innovation Solution
A method involving a tab and slot connection system where a plate with an external pin member is bonded to a tab on one panel and a case with a channel is bonded to the other panel, allowing the tab to be inserted and the pin to slide into the channel for secure locking, enabling reversible assembly and disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesives are used to join panels, then bond strength is achieved, but disassembly becomes impossible and adhesive overapplication occurs
Solution Approach 1:
The adhesive bonding process is segmented into two distinct phases: (1) applying adhesive to the case and allowing it to become tacky, and (2) applying adhesive to the tab and immediately bonding it to the case before the adhesive sets. This segmentation allows controlled application and prevents overapplication, while the modular tab-case design enables disassembly by reversing the bonding sequence.
Solution Approach 2:
The joining system transitions from a static permanent bond to a dynamic reversible process. The adhesive remains in a tacky (temporary) state during assembly, allowing for adjustment and correction. Once bonded, the mechanical interlock of the tab in the case provides structural stability, but the entire assembly can be disassembled by removing the tab from the case, enabling repair and reconfiguration.
2Manufacturing precision
If adhesive is overfilled to compensate for void space, then bonding coverage is improved, but excess adhesive removal becomes difficult
Solution Approach 1:
The case is prepared with adhesive applied to its bonding surface and allowed to become tacky before the tab is introduced. This preliminary action ensures the adhesive is in the optimal state for bonding when the tab is inserted, eliminating the need to overfill. The tab then carries a controlled amount of adhesive that is immediately transferred to the case, ensuring complete coverage without excess.
3Productivity
If visual confirmation of adhesive application is limited, then assembly speed is maintained, but bond reliability decreases
Solution Approach 1:
The design provides immediate visual feedback through the mechanical interlock of the tab in the case. When the tab is inserted into the case, the connection is visually confirmed, indicating proper bonding. This eliminates the need for complex adhesive visualization systems while maintaining bond reliability through direct observation of the mechanical connection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution provides a strong, reversible connection that allows for easy disassembly and repair of composite panels without the need for viscous adhesives, facilitating access to previously obscured areas and reducing the risk of adhesive overapplication.
Implementation Method 1
adhesively bonding a case in a slot of a first panel, the case having a channel on an inner side. The method may further include adhesively bonding a plate to a tab portion of a second panel
Data Source
AI summary
A method of joining panels is disclosed, including adhesively bonding a case in a slot of a first panel, the case having a channel on an inner side, and adhesively bonding a plate to a tab portion of a second panel, the plate having an external pin member. The method further includes inserting the tab portion of the second panel into the case in the slot of the first panel and sliding the external pin member of the plate along the channel on the inner side of the case, to a locking position.