Aerospace Composite Window Pane for Weight and Fire Safety
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Solution Overview
Problem
Current composite materials for aircraft interior window panes fail to meet the stringent requirements of low weight per unit area, high thermal safety, and optical transparency while also ensuring fire protection and scratch resistance, as they either exceed weight limits or compromise on transparency when enhanced for fire safety.
Innovation Solution
A lightweight composite pane comprising a mineral glass or glass-ceramic layer with a thin organic layer, optimized to achieve a weight per unit area between 0.5 kg/m2 and 5.5 kg/m2, with a thickness ratio of 1:0.01 to 1:0.15, and a transparency of over 80% in the visible wavelength range, while meeting stringent thermal safety and fire protection standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mineral glass pane is used to meet thermal safety requirements, then fire protection is improved, but weight per unit area increases
Solution Approach 1:
The patent applies composite materials by combining a thin mineral glass layer (0.1-1.0 mm) with an organic polymer layer to create a laminate structure. This composite approach allows the glass layer to provide fire protection while the thin design and organic layer compensate for weight, achieving both thermal safety compliance and weight reduction compared to traditional thick glass panes.
2Weight of stationary object
If the thickness of the glass layer is reduced to decrease weight, then weight per unit area is improved, but strength decreases
Solution Approach 1:
The patent uses composite materials by creating a laminate structure where a thin mineral glass layer (0.1-1.0 mm) is combined with an organic polymer layer. This composite construction allows the glass to be much thinner than traditional panes while the organic layer provides structural support, maintaining overall strength despite the reduced glass thickness and corresponding weight reduction.
Solution Approach 2:
The patent applies segmentation by dividing the pane into multiple functional layers: a thin mineral glass layer for fire protection and an organic polymer layer for structural support. This segmentation allows each layer to be optimized for its specific function, enabling the glass layer to be thin and light while the composite structure maintains overall strength.
3Weight of stationary object
If an organic layer is added to reduce weight and improve fire protection, then weight per unit area and fire protection are improved, but optical transparency deteriorates
Solution Approach 1:
The patent applies local quality by making the organic layer extremely thin (50-500 μm) and strategically positioning it adjacent to the glass layer. This localized, thin application minimizes the organic material's impact on optical transparency while still achieving weight reduction and fire protection benefits, preserving high light transmission for window applications.
4Reliability
If a thick organic layer is used to meet fire protection requirements, then fire protection is improved, but weight per unit area increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the organic layer thickness to 50-500 μm, which is thin enough to maintain low weight per unit area but sufficient to contribute to fire protection when combined with the glass layer. This optimized thickness parameter achieves fire safety compliance without the weight penalty of thicker organic layers.
Data Source
AI summary
A lightweight composite pane is provided that includes a mineral glass or glass-ceramic pane and an organic layer. The weight per unit area of the lightweight composite pane is in the range from 0.5 kg/m2 to 5.5 kg/m2, the ratio of the thickness of the mineral glass pane to the thickness of the organic layer is 1:0.01 to 1:1, and the thickness of the organic layer is less than or equal to 500 μm. The lightweight composite pane meets the thermal safety requirements of aerospace authorities and has a “Total Heat Release,” measured in compliance with JAR/FAR/CS 25, App. F, Part IV & AITM 2.0006, of less than 65 kW×min/m2 and a flame time, after removal of the flame in the “Vertical Bunsen Burner Test”, measured in compliance with FAR/JAR/CS 25, App. F, Part 1 & AITM 2.0002A, is less than 15 seconds.