Self-Powered CFRP with Embedded Micro Power Supply
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Solution Overview
Problem
Current non-destructive detection methods for carbon fiber reinforced polymer (CFRP) composites, such as optical fiber sensing, require external sensors that are labor-intensive to install and may degrade mechanical performance due to fragility and weak bonding, limiting their application and repairability, especially in aerospace and rail transit where online monitoring is needed without deactivating components.
Innovation Solution
A CFRP preparation method with a designable characteristic structure incorporating multiple layers of carbon fabric and a micro power supply for in-situ damage detection, using conductive carbon fibers to monitor resistance changes and embed sensors for precise, accurate, and intelligent real-time feedback, eliminating the need for external power sources and enhancing repairability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external sensors (e.g., optical fiber) are attached to the CFRP structure for online detection, then damage detection capability is improved, but installation time and labor intensity increase significantly
Solution Approach 1:
The patent merges the sensing function with the CFRP structure itself by embedding conductive carbon fibers and micro power supplies directly into the composite material during manufacturing. This integration eliminates the need for separate external sensors and their complex installation processes, thereby maintaining damage detection capability while dramatically reducing installation time and labor requirements
Solution Approach 2:
The CFRP structure becomes self-monitoring through embedded conductive carbon fibers that automatically detect damage through resistance changes. The micro power supplies embedded within the structure provide self-powered operation without external wiring, enabling the structure to monitor its own health status without requiring external sensor installation
2Reliability
If external sensors are attached to the CFRP structure, then online monitoring is achieved, but the fragility and weak bonding of sensors degrade mechanical performance
Solution Approach 1:
By merging the sensing function with the structural material itself through embedded conductive carbon fibers, the patent eliminates the sensor-structure interface that causes bonding weaknesses. The conductive fibers become an integral part of the CFRP composite, maintaining mechanical continuity and strength while providing online monitoring capability
Solution Approach 2:
The patent utilizes the composite nature of CFRP by incorporating conductive carbon fibers as both structural and sensing elements. This dual-function approach allows the material to maintain its mechanical properties while inherently providing damage detection capability through electrical resistance measurements
3Reliability
If external sensors are attached to the CFRP structure, then damage detection is enabled, but the large size of optical fiber sensors creates potential interface defects
Solution Approach 1:
The patent segments the sensing function into microscopic conductive carbon fiber elements distributed throughout the CFRP structure, replacing large external optical fiber sensors. This segmentation eliminates the need for large sensor interfaces that create bonding defects, as the conductive fibers are integrated at the material level without creating external interface zones
Solution Approach 2:
The patent transitions from external, surface-level sensor attachment to internal, volumetric embedding of conductive elements within the CFRP structure. This dimensional shift from 2D surface mounting to 3D internal integration eliminates interface defects by distributing the sensing function throughout the material volume rather than concentrating it at external interfaces
4Strength
If thermosetting matrix is used in CFRP, then high strength and stiffness are achieved, but damage repair by reheating becomes difficult
Solution Approach 1:
The patent changes the matrix material parameter from thermosetting to thermoplastic resin. This parameter change maintains the high strength and stiffness requirements while enabling damage repair through reheating, as thermoplastic matrices can be melted and reformed to restore damaged areas, providing repairability that thermosetting matrices lack
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 method improves detection accuracy and reliability, predicts and controls crack propagation, and extends the service life of CFRP components by integrating a non-destructive online monitoring system with enhanced mechanical performance and repair capabilities, allowing for passive, wireless monitoring and repair of damaged areas.
Implementation Method 1
Combination of the micro power supply and a conductive property of the carbon fabric may be applied to easily and quickly detect locations of various defects such as cracks and damage in the product
Data Source
AI summary
The disclosure discloses a preparation method and product of carbon fiber reinforced polymer composites with a designable characteristic structure. The method includes: (a) choosing carbon fabrics as raw material, where a predetermined number of the fabrics are selected to deposit the reinforcement phase; (b) coating all carbon fabrics with resin matrix, placing the fabrics layer by layer, where the carbon fabrics with the reinforcement phases are placed in a predetermined layer, meanwhile a micro power supply is placed in a setting layer during the stacking process, then a prefabricated product is obtained; (c) placing the prefabricated product in a vacuum bag then evacuating and sealing, hot pressing the sealed prefabricated product, finally the carbon fiber reinforced polymer composite product in the vacuum bag after hot pressing is successfully manufactured.