Square Glass Fiber Coating for Transparent Composite Optical Clarity
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Solution Overview
Problem
Existing transparent composite materials face challenges in maintaining optical clarity and strength, particularly under high impact and structural loads, due to refractive effects from fiber geometry and inconsistencies, which affect light transmission and ballistic resistance.
Innovation Solution
A transparent composite window is developed using a glass fiber with a first glass material coated by a second glass material having a lower coefficient of thermal expansion, ensuring chemical and thermal compatibility, and matching refractive indices to minimize distortion and enhance strength through compressive stresses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If round fibers are used as reinforcing fibers in transparent composite materials, then the composite provides light transmission capability, but the round fiber geometry creates prismatic optical light refractive effects that cause overall distortion of the light passing through the transparent device
Solution Approach 1:
The patent changes the geometric parameter of the fiber from round to square cross-section. This parameter change eliminates the prismatic optical light refractive effects that cause distortion, while maintaining the fiber's ability to transmit light. The square geometry provides flat surfaces that do not create the same optical distortion as curved surfaces.
2Strength
If the composite material is designed to withstand high impacts and structural loads, then the strength properties are improved, but the material requires high strength fibers that are susceptible to crack propagation from surface imperfections
Solution Approach 1:
The patent creates a composite fiber structure with an inner glass fiber core and an outer ceramic coating layer. This composite material combines the high strength of glass fiber with the crack resistance and toughness of ceramic materials. The ceramic coating acts as a protective layer that prevents crack initiation and propagation from surface imperfections.
Solution Approach 2:
The ceramic coating is applied beforehand to protect the glass fiber core from surface cracks and imperfections. This protective layer serves as a cushion against mechanical damage and environmental degradation, preventing the initiation of cracks that would otherwise compromise the fiber's strength.
3Strength
If a ceramic coating is applied to glass fiber to improve strength and fracture toughness, then the overall fiber strength is improved, but the coating must be chemically and thermally compatible with the core material to maintain structural integrity
Solution Approach 1:
The patent carefully selects ceramic materials whose thermal expansion coefficients, melting points, and chemical properties are compatible with the glass fiber core. This parameter matching ensures that the coating and core expand and contract together during thermal cycling and do not undergo adverse chemical reactions, maintaining the integrity of the composite fiber structure.
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 solution achieves improved optical clarity and increased strength by reducing refractive distortion and crack propagation, while maintaining compatibility and thermal stability, thus enhancing the material's ability to withstand impacts and structural loads.
Implementation Method 1
enhance strength through compressive stresses
Implementation Method 2
The first refractive index is equal to the second refractive index and the first refractive index is equal to the refractive index of the polymer
Data Source
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AI summary
A glass fiber and a method of manufacturing a glass fiber for reinforcing a transparent composite matrix are disclosed. The invention is directed to a composite structure formed from glass fibre (100) and a polymer, wherein the glass fibre includes a first glass material (110) and a second glass material (120) with the second glass material forming a substantially uniform coating around the first glass material; the first glass material having a first set of properties including a first refractive index, a first Abbe number, a first transmission, a first modulus and a first coefficient of thermal expansion; the second material having a second set of properties including a second refractive index, a second Abbe number, a second transmission, a second modulus and a second coefficient of thermal expansion, the second coefficient of thermal expansion being less than the first coefficient of expansion; and the second glass material being chemically and thermally compatible with the first glass material, and the second glass material not containing elements that negatively affect the desirable properties of the first glass material.