CFRP Blade Conductive Patch for Lightning Current Transfer
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Solution Overview
Problem
Providing a conductive connection between Carbon Fibre Reinforced Polymer (CFRP) elements and down conductors without compromising the strength or structural integrity of the CFRP elements, which are prone to lightning strikes and require effective lightning protection systems.
Innovation Solution
A conductive connection is established using an interface conductive patch on the CFRP element, with a conductive coating applied as an intermediate layer, and a structured layer of carbon fibers to ensure proper conductivity, utilizing methods like electroplating, brushing, or spraying, and materials such as metal or graphene, while maintaining the structural integrity of the CFRP elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive connection is provided between the CFRP element and down conductor by directly attaching conductive materials, then electrical conductivity for lightning protection is improved, but the strength and structural integrity of the CFRP element deteriorates
Solution Approach 1:
The patent introduces an interface conductive patch as an intermediary element between the CFRP element and the down conductor. This patch serves as a mediator that provides electrical connectivity for lightning protection while being designed to minimize structural impact. The patch can be made of conductive materials and attached in a way that distributes stress and preserves the structural integrity of the CFRP element, thus resolving the contradiction between electrical conductivity and structural strength.
Solution Approach 2:
The interface conductive patch is applied locally at specific connection points rather than covering the entire CFRP element. This localized approach ensures that conductivity is provided only where needed for lightning protection, while the majority of the CFRP element maintains its original structural properties. The local application minimizes the impact on overall structural strength while achieving the required electrical connectivity.
2Reliability
If conductive materials are attached to the CFRP element surface, then electrical conductivity is improved, but the structural integrity and bonding to other parts deteriorates
Solution Approach 1:
The interface conductive patch acts as an intermediary layer that is specifically designed to bond with both the CFRP element surface and the down conductor. This mediator layer is engineered to have appropriate adhesive properties that ensure strong bonding without compromising the CFRP element's structural integrity. The patch can incorporate bonding agents or surface treatments that enhance adhesion while maintaining electrical conductivity.
Solution Approach 2:
The interface conductive patch can be constructed as a composite material that combines conductive properties with bonding capabilities. This composite structure may include conductive fillers embedded in a bonding matrix, or multiple layers with different functions (conductive layer, adhesive layer, protective layer). The composite nature allows the patch to simultaneously achieve electrical connectivity, strong bonding to CFRP, and structural stability.
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
This solution effectively directs lightning current away from the CFRP elements, ensuring their strength and structural integrity while providing a reliable conductive path for lightning protection without interfering with the CFRP's structural properties.
Implementation Method 1
the conductive coating may be applied by electroplating
Data Source
AI summary
A conductive connection between a Carbon Fiber Reinforced Polymer (CFRP) element and one or more down conductor(s), the CFRP element being electrically conductive and has a face. The conductive connection including an interface conductive patch provided on the face of CFRP element for electrically connecting the CFRP element with the interface conductive patch, the interface conductive patch is electrically connected with the one or more down conductor(s).