3D Electroconductive Knitted Mat for Lightning-Resistant Composites
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Solution Overview
Problem
Existing methods for creating lightning-resistant composite parts, such as aircraft fuselage components, face challenges in achieving homogeneous electrical charge distribution and mechanical integrity due to complex draping processes, material losses, and thermal degradation, especially when dealing with three-dimensional complex geometries.
Innovation Solution
A three-dimensional electroconductive knitted fabric made from electroconductive metal filament yarns, which allows for continuous fiber continuity and efficient charge distribution, is used, combined with thermoplastic or thermosetting polymer materials to form a composite that can be easily scaled up industrially and maintains mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If woven metal fabrics are used for lightning protection, then electrical charge distribution is improved, but manufacturing complexity and material loss increase due to cutting and draping requirements
Solution Approach 1:
The patent uses a knitted fabric structure instead of traditional woven metal fabrics. The knitted structure inherently provides three-dimensional flexibility and conformability to complex geometries without requiring cutting or complex draping operations, while maintaining electrical conductivity for lightning protection
Solution Approach 2:
The patent combines electroconductive metal filament yarns with thermoplastic or thermosetting polymer materials to create a composite knitted fabric. This composite structure provides both the electrical conductivity needed for lightning protection and the mechanical properties required for structural applications
2Shape
If pre-impregnated fabrics are cut and arranged in molds, then three-dimensional shape formation is achieved, but material loss and production time increase
Solution Approach 1:
The knitted fabric structure can be directly formed into three-dimensional complex geometries through the knitting process itself, eliminating the need for cutting and arranging multiple layers in molds. The inherent flexibility of knitted structures allows them to conform to complex shapes while maintaining fiber continuity
Solution Approach 2:
The electroconductive knitted fabric is manufactured with the desired three-dimensional geometry already integrated into its structure before being used in the final application. This preliminary formation of the 3D shape eliminates subsequent cutting and arrangement steps
3Strength
If thermosetting matrices are used in electroconductive composites, then structural integrity is improved, but thermal degradation and hole formation occur during lightning strikes
Solution Approach 1:
The patent changes the matrix material parameter from thermosetting to thermoplastic polymers. Thermoplastic materials have better thermal resistance and do not degrade or form holes when exposed to the high temperatures generated during lightning strikes, while still providing structural support when combined with the electroconductive metal yarns
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 enables effective and homogeneous electrical charge distribution and mechanical integrity, preventing damage from repeated lightning strikes while reducing material waste and thermal issues, allowing for the production of complex three-dimensional components with improved scalability and implementation efficiency.
Implementation Method 1
capable of homogeneously distributing electrical charges over the entire surface thereof
Data Source
AI summary
A three-dimensional electroconductive mat formed of an electroconductive knitted fabric capable of homogeneously distributing electrical charges over the entire surface thereof, wherein the knitted fabric includes at least one electroconductive metal filament yarn; a composite material including such a mat, and 40 to 95% by volume of a thermoplastic and/or thermosetting polymer material.