Fiber Composite Bonding with Insulated Conductive Fiber Heating
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Solution Overview
Problem
Existing out-of-autoclave bonding methods for fiber composite parts require complex assembly setups and high energy consumption, and there is a need for efficient in-situ heating solutions that minimize heat losses and avoid leakage currents.
Innovation Solution
Integrate conductive fibers with electrically insulating coatings, such as carbon fibers coated with a solid polymer electrolyte, to generate heat in-situ for bonding fiber composite components, allowing for secondary bonding, co-bonding, and co-curing without external heating sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If out-of-autoclave bonding is used with external heating sources, then bonding can be achieved without autoclave, but complex assembly setups and high energy consumption are required
Solution Approach 1:
The conductive fibers are integrated directly into the fiber composite components, allowing the components to heat themselves during bonding through electrical current application. This eliminates the need for external heating sources and complex assembly setups, enabling the components to serve their own heating needs during the bonding process
Solution Approach 2:
The conductive fibers serve dual functions: they act as both structural reinforcement elements within the fiber composite and as heating elements for the bonding process. This multi-functionality eliminates the need for separate heating components and simplifies the overall bonding system
2Ease of manufacture
If out-of-autoclave bonding with external heating sources is used, then bonding can be achieved, but high energy consumption is required
Solution Approach 1:
The heating function is localized directly at the bonding interface through conductive fibers embedded in the components. This localized heating approach eliminates energy losses associated with external heating sources, as heat is generated only where needed for bonding rather than being applied globally through external equipment
3Temperature
If conventional heating methods are used for bonding, then bonding temperature can be achieved, but heat losses occur
Solution Approach 1:
The conductive fibers with electrically insulating coatings act as intermediaries that transfer electrical energy directly to thermal energy at the bonding interface. The insulating coating prevents energy leakage while the conductive fiber core generates heat through electrical resistance, efficiently achieving bonding temperature without heat losses
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
Reduces labor costs and lead time, minimizes heat losses, and avoids leakage currents, enabling efficient and cost-effective manufacturing of fiber composite structures with improved structural integrity.
Implementation Method 1
passing an electric current through the conductive fibers by electrically contacting the conductive fibers at their protruding ends so that the respective fiber composite component is heated at the bonding surface to a curing temperature
Data Source
AI summary
A method for bonding two fiber composite components with each other to form a fiber composite structure includes integrating conductive fibers underneath a bonding surface of at least one of the two fiber composite components, each conductive fiber comprising a carbon fiber coated with an electrically insulating coating, the conductive fibers running along the bonding surface and protruding at least at their ends from the respective fiber composite component; arranging the two fiber composite components against each other at their respective bonding surfaces; passing an electric current through the conductive fibers by electrically contacting the conductive fibers at their protruding ends so that the respective fiber composite component is heated at the bonding surface to a curing temperature; and joining the two fiber composite components with each other at their bonding surfaces via secondary bonding, co-bonding and/or co-curing at the curing temperature, thereby forming the fiber composite structure.