Polyimide Film Mediator for Composite Panel Consolidation
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Solution Overview
Problem
Traditional methods for manufacturing composite material panels, such as those used in aircraft fuselage production, often result in surface imperfections and porosity due to the direct contact between the compacting plate and the stack of fiber prepregs, leading to reduced mechanical resistance and incompatibility with high surface quality demands.
Innovation Solution
The method involves using polyimide films partially covering each other between the stack of fiber prepregs and the compacting plate, allowing for excellent gas drainage and preventing surface imprinting, while also employing drainage fabrics and wedges to manage edge effects and ensure precise thickness control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a compacting plate is used directly in contact with the stack of fiber prepregs during consolidation, then consolidation pressure is effectively applied, but surface imperfections and imprinting occur on the panel surface
Solution Approach 1:
A polyimide film is introduced as an intermediary layer between the compacting plate and the stack of fiber prepregs. This film mediates the contact during consolidation, allowing pressure to be effectively transmitted while preventing direct imprinting of the compacting plate's surface state onto the panel, thereby resolving the contradiction between achieving sufficient consolidation pressure and maintaining high surface quality.
2Reliability
If a compacting plate is used directly in contact with the stack of fiber prepregs during consolidation, then consolidation is achieved, but porosity increases due to restricted air evacuation
Solution Approach 1:
The polyimide film serves as a mediator that allows air and gas to pass through its overlapping zones during consolidation. This enables effective air evacuation from the stack while still providing the necessary consolidation pressure, thus reducing porosity without compromising consolidation effectiveness.
Solution Approach 2:
The polyimide film is a thin, flexible material that can conform to the stack during consolidation while maintaining overlapping zones that allow gas permeation. This flexibility enables the film to transmit pressure effectively while simultaneously allowing air evacuation, resolving the contradiction between consolidation effectiveness and porosity reduction.
3Manufacturing precision
If polyimide films with overlapping zones are used between the compacting plate and the stack, then surface quality improves and gas drainage is enhanced, but the device complexity increases
Solution Approach 1:
The polyimide film is a simple yet effective thin film solution that provides both surface protection and gas drainage functionality through its overlapping zones. Despite the added layer, the film's simplicity and dual functionality minimize the actual increase in device complexity while delivering significant improvements in surface quality and gas evacuation.
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 approach yields panels with enhanced surface quality, reduced void ratios, and improved mechanical resistance, meeting the stringent requirements of the aeronautical industry by preventing surface imperfections and ensuring effective gas evacuation during the consolidation process.
Implementation Method 1
the overlapping zones of the polyimide films therefore advantageously forming an assembly not ensuring total sealing to the gases toward the top
Implementation Method 2
This compacting plate makes it possible, in fact, through the application of pressure/vacuum pressure, to compact, in the direction of the stack, the unit formed by the layers of fiber prepregs
Implementation Method 3
This consolidation step of the stack also takes place by applying heating to said stack, for example by placing it in a sterilizer, in order to bring it to the temperature required to obtain the fusion of the pre-impregnated resin on the fibers
Implementation Method 4
through the application of pressure/vacuum pressure, to compact, in the direction of the stack, the unit formed by the layers of fiber prepregs, and simultaneously to evacuate the air and the gases present in the stack
Data Source
AI summary
A method of manufacturing a panel made of a composite material using a tool having a support on which a lay-up is performed, the lay-up producing a stack of plies of fiber prepregs, followed by consolidating the stack aiming to obtain the panel using a compacting plate arranged above the stack. The method is implemented such that a first set of polyimide films partially covering each other is located in contact with the stack of plies, between the latter and the compacting plate.