Glass-Resin Composite Window with Low-Crystallinity Inner Sheet
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Solution Overview
Problem
Current glass-resin composites for vehicle windows face challenges in balancing impact resistance, weight, and transparency, with crystallized glass offering increased hardness but reduced bending workability and increased weight, and soda lime glass providing insufficient impact resistance.
Innovation Solution
A glass-resin composite with a Young's modulus of 75 GPa or more for inner glass sheets and low crystallinity, combined with a polycarbonate resin sheet, to enhance impact resistance and bending workability while maintaining a thin and lightweight structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the crystallinity of crystallized glass is increased to increase hardness and attenuate collision energy, then the collision energy attenuation is improved, but the bending workability becomes difficult
Solution Approach 1:
The invention applies different crystallinity levels to different glass sheets within the composite structure. Specifically, the outer glass sheet has high crystallinity (30-70%) for hardness and impact resistance, while the inner glass sheet has low crystallinity (0-20%) for bending workability. This local differentiation resolves the contradiction by assigning opposite properties to different components based on their functional requirements.
Solution Approach 2:
The invention creates a composite glass structure where multiple glass sheets with different crystallinity levels are combined with resin layers. This composite approach allows the system to simultaneously achieve high hardness (from the crystallized outer sheet) and good workability (from the amorphous inner sheet), resolving the contradiction through material composition rather than relying on a single material property.
2Strength
If the thickness of the crystallized glass sheet is increased to attenuate collision energy, then the collision energy attenuation is improved, but the weight and thickness of the window glass increase
Solution Approach 1:
The invention combines glass sheets with resin materials (such as polycarbonate or acrylic) to create a composite window glass structure. The resin layers contribute to impact resistance while being lighter than glass, allowing the overall structure to achieve high impact attenuation without proportionally increasing weight. This enables thinning of the glass components while maintaining safety performance.
Solution Approach 2:
The invention concentrates the crystallinity (and thus the hardness and primary impact resistance) in the outer glass sheet that directly faces the impact, while using thinner or amorphous inner sheets. This localized application of high crystallinity optimizes impact resistance at the impact interface without requiring the entire glass structure to be thick and heavy.
3Strength
If the thickness of the glass sheet is increased to improve impact resistance, then the impact resistance is improved, but the transparency is impaired
Solution Approach 1:
The invention uses resin materials (polycarbonate, acrylic) with high transparency and good impact resistance to supplement the glass sheets. These resin layers maintain optical clarity while providing impact attenuation, allowing the overall structure to achieve both transparency and impact resistance without relying solely on increased glass thickness which would compromise transparency.
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
The composite effectively attenuates collision energy by increasing the speed of impact waves and their reflections, preventing penetration and maintaining transparency and visibility.
Implementation Method 1
the collision energy with a scattered piece can be effectively attenuated by controlling a Young's modulus of an inner glass sheet
Implementation Method 2
increasing the speed of impact waves and their reflections
Implementation Method 3
preventing scattering of a glass piece caused by the impact of the scattered piece
Data Source
AI summary
A glass-resin composite of the present invention includes at least a plurality of glass sheets and a resin sheet which are integrally combined with each other via an organic resin intermediate layer, wherein, out of inner glass sheets of the plurality of glass sheets, at least one glass sheet has a crystallinity of 30% or less and a Young's modulus of 75 GPa or more.