Aircraft Glazed Unit Reinforcing Gasket for Bending and Sealing
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Solution Overview
Problem
Multiple glazed units in aircraft windows face significant mechanical bending and humidity issues due to pressurization stresses and temperature variations, leading to potential breakage and delamination of the external laminated pane.
Innovation Solution
Incorporating a reinforcing and sealing element made of a rigid material, such as metal or composite, into the mounting gasket to limit bending deformation and create a moisture barrier, which is supported on the edge face of the internal pane and covers the peripheral portion of the external pane, reducing the risk of breakage and humidity ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the external pane is made laminated to add features and improve safety, then the pane strength and safety are improved, but the risk of humidity penetration and delamination increases
Solution Approach 1:
A waterproofing layer is introduced as an intermediary element between the laminated external pane and the mounting gasket. This layer acts as a barrier that prevents humidity penetration while allowing the laminated structure to maintain its strength and safety features. The waterproofing layer is positioned between the pane and gasket to block moisture pathways without compromising the pane's structural integrity.
Solution Approach 2:
The mounting gasket is designed as a composite structure combining a waterproofing layer with a mounting element. This composite construction integrates the moisture barrier function with the mechanical mounting function, creating a multi-functional component that addresses both humidity protection and structural support requirements simultaneously.
2Reliability
If the external pane is made laminated to improve safety features, then the safety is improved, but the adhesive interlayer is subjected to tensile stresses causing delamination and bubbling
Solution Approach 1:
The waterproofing layer serves as a protective intermediary that shields the adhesive interlayer from direct exposure to humidity and environmental stresses. By positioning this barrier layer between the external environment and the laminated structure, the adhesive bonding is protected from degradation, preventing delamination and bubbling while maintaining the safety benefits of the laminated construction.
3Object-affected harmful factors
If the mounting gasket covers the peripheral portion of the external pane, then the sealing is improved, but the bending deformation of the external pane increases
Solution Approach 1:
The mounting gasket is segmented into distinct functional zones: a waterproofing layer for sealing, a mounting element for mechanical support, and a reinforcement element for structural stability. This segmentation allows each component to perform its specific function optimally - the reinforcement element counteracts bending deformation while the waterproofing layer provides sealing, resolving the conflict between these two requirements.
4Stability of the object's composition
If a reinforcing element is added to the mounting gasket to limit bending, then the pane stability is improved, but the device complexity increases
Solution Approach 1:
The reinforcement element is merged with the mounting gasket structure, integrating the bending resistance function into the existing mounting component rather than adding a separate structural element. This merging approach provides the necessary pane stability while minimizing additional complexity, as the reinforcement is incorporated within the gasket's peripheral portion rather than requiring separate structural additions.
Data Source
AI summary
A multiple glazed unit includes a first pane and a second pane separated by an air gap, a mounting gasket covering a peripheral strip of the main surface of the first pane facing the second pane, the mounting gasket covering the edges of the first pane and of the second pane and occupying a peripheral portion of the air gap, a reinforcing and sealing element being incorporated in the mounting gasket by covering a peripheral portion of the main surface of the first pane facing the second pane and by engaging the edge of the second pane so as to limit the bending effect of the first pane.