Stitched EM-Absorbing Composite for Low-Speed Impact Protection
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Solution Overview
Problem
Current composite materials used in aircraft structures face limitations in both electromagnetic wave absorption and low-speed impact protection due to anisotropic properties and vulnerability to interlayer separation, which compromises their structural integrity and electromagnetic wave absorption performance.
Innovation Solution
A stitched electromagnetic wave-absorbing composite is developed using glass fiber or glass fiber reinforced plastics (GFRP) with a stitching method that incorporates dielectric fibers like aramid, silicon carbide, or metal electroless plated dielectric fibers, applied in a continuous manner to enhance both electromagnetic wave absorption and impact protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If composite materials are used for electromagnetic wave absorption, then electromagnetic wave absorption performance is improved, but impact protection performance deteriorates due to interlayer separation
Solution Approach 1:
The patent applies a composite structure combining electromagnetic wave absorbing composite material and reinforcement members (stitching yarns) to simultaneously achieve electromagnetic wave absorption and impact protection. The reinforcement members are embedded within the composite material layers to prevent interlayer separation while maintaining the electromagnetic wave absorption properties of the composite material.
2Strength
If reinforcement methods are applied to prevent interlayer separation, then impact protection performance is improved, but electromagnetic wave absorption performance deteriorates
Solution Approach 1:
The reinforcement members are strategically positioned at specific locations within the composite material where interlayer separation is most likely to occur during impact. This localized reinforcement approach provides impact protection while minimizing the overall volume of reinforcement material, thereby preserving the electromagnetic wave absorption performance of the composite structure.
3Strength
If stitching method is applied continuously, then impact protection performance is improved, but device complexity increases
Solution Approach 1:
The reinforcement structure is segmented into discrete stitching yarns distributed throughout the composite material rather than using a continuous complex reinforcement system. This segmentation approach provides effective impact protection through multiple localized reinforcement points while keeping the overall structure relatively simple and easy to manufacture.
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 maintains excellent electromagnetic wave absorption performance in the target frequency band and provides effective low-speed impact protection by preventing interlayer separation, ensuring structural integrity and consistent absorption performance even after impacts.
Implementation Method 1
a composite composed of at least one of glass fiber, epoxy, or glass fiber reinforced plastics (GFRP) in an electromagnetic wave-absorbing composite, wherein the composite absorbs electromagnetic waves
Data Source
AI summary
The present disclosure relates to a stitched electromagnetic wave-absorbing composite for low-speed impact protection, and particularly, to a composite that exhibits electromagnetic wave absorption performance and low-speed impact protection performance at the same time by applying a stitching method, a thickness direction reinforcement method, to a composite that is an electromagnetic wave absorber. The present disclosure provides a stitched electromagnetic wave-absorbing composite for low-speed impact protection including a composite composed of at least one of glass fiber, epoxy, or glass fiber reinforced plastics (GFRP) in an electromagnetic wave-absorbing composite, wherein the composite absorbs electromagnetic waves, and has an impact protection system applied thereto through stitching.