Composite material structure
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Solution Overview
Problem
Conventional composite laminate structures face challenges in reducing potential differences around adhesive layers during lightning strikes, leading to dielectric breakdown, and require complex material adjustments for impedance matching, which complicates manufacturing and reduces efficiency.
Innovation Solution
A composite material structure featuring electrically conductive reinforcing fibers impregnated with resin, adhesive layers, and electromagnetic shielding members covering exposed areas, with the shielding members disposed orthogonal to the lightning current direction to reduce potential differences and enhance lightning resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a structural bond line with carbon fiber scrim is used to match impedance and reduce lightning effects, then lightning resistance is improved, but material selection and assembly complexity increase
Solution Approach 1:
The patent extracts the electromagnetic shielding function from the structural bond line itself and places it on the adhesive layer. By applying electromagnetic shielding material specifically to the adhesive layer exposed to the exterior, the solution separates the shielding function from the structural bonding function, allowing each to be optimized independently without complex material matching requirements.
Solution Approach 2:
The patent applies electromagnetic shielding material locally only to the adhesive layer areas exposed to the exterior, rather than requiring the entire bond line to have matched impedance properties. This localized approach provides targeted lightning protection where it is most needed while simplifying material selection and assembly processes.
2Ease of manufacture
If conventional adhesive layers are used without electromagnetic shielding, then manufacturing is simpler, but potential difference generation during lightning strikes causes dielectric breakdown
Solution Approach 1:
The patent introduces an electromagnetic shielding material as an intermediary layer on the adhesive layer. This shielding layer acts as a mediator that intercepts lightning currents before they can pass through the adhesive layer and generate harmful potential differences, thereby protecting the adhesive layer while maintaining manufacturing simplicity.
3Reliability
If electromagnetic shielding material is applied to the adhesive layer, then lightning resistance is improved, but manufacturing complexity increases
Solution Approach 1:
The electromagnetic shielding material is applied only to the specific areas of the adhesive layer that are exposed to the exterior, rather than the entire bond line. This localized application reduces manufacturing complexity compared to shielding the entire structure while still providing adequate lightning protection where it is most needed.
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 effectively reduces potential differences around adhesive layers during lightning strikes, improving lightning resistance in a simple configuration and reducing manufacturing complexity.
Implementation Method 1
an electromagnetic shielding member covering at least part of an area, exposed to an exterior, of the adhesive layer
Implementation Method 2
a first reinforcing fiber that is electrically conductive and impregnated with a first resin
Data Source
AI summary
A composite material structure includes: a first composite material member including a first reinforcing fiber that is electrically conductive and impregnated with a first resin; a second composite material member including a second reinforcing fiber that is electrically conductive and impregnated with a second resin; an adhesive layer disposed between the first composite material member and the second composite material member to bond the first composite material member to the second composite material member; and an electromagnetic shielding member covering at least part of an area, exposed to an exterior, of the adhesive layer. At least one of the first and second composite material members has a predefined lightning current direction in which a lightning current generated by a lightning strike passes. The shielding member is disposed over an entire plane of a side face in a direction orthogonal to the lightning current direction.