Smart Multi-Layer Composites With Graphene Damage Detection
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Solution Overview
Problem
Multi-layer composites used in structural applications like cars and airplanes are vulnerable to internal damage from impulsive loads, making it difficult to detect and diagnose damage without external sensors, which complicates maintenance and safety.
Innovation Solution
Incorporating a graphene layer between the layers of the composite, which utilizes its piezo-resistive characteristics to detect changes in resistance and identify internal damage without the need for additional strain sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a composite structure is used to achieve lightweight and high strength, then mechanical performance is improved, but internal damage detection becomes difficult
Solution Approach 1:
A graphene layer is introduced as an intermediary between the composite layers. This graphene layer serves as a mediator that converts internal mechanical damage into detectable electrical resistance changes, enabling non-contact detection of damage without compromising the structural integrity or mechanical strength of the composite.
Solution Approach 2:
The patent utilizes resistance changes in the graphene layer as an indicator of internal damage. By monitoring electrical resistance (analogous to color changes in visual detection), the system can detect and locate damage within the composite structure without physical inspection, transforming an invisible damage state into a measurable signal.
2Difficulty of detecting and measuring
If additional strain sensors are installed to detect internal damage, then detection capability is improved, but device complexity increases
Solution Approach 1:
The graphene layer performs multiple functions simultaneously: it acts as a structural component within the composite, provides electrical conductivity for resistance-based damage detection, and serves as a sensing element. This multi-functionality eliminates the need for separate strain sensors, reducing device complexity while maintaining detection capability.
Solution Approach 2:
The graphene layer is integrated directly into the composite structure, allowing it to self-monitor its own structural integrity through resistance changes. The damage detection function is embedded within the material itself rather than requiring external sensing systems, enabling the structure to detect its own damage states.
3Reliability
If the composite structure is made more robust to withstand impulsive loads, then reliability is improved, but damage visibility from outside deteriorates
Solution Approach 1:
The graphene layer functions as an intermediary that bridges the gap between internal damage and external detection. It translates internal mechanical stress and damage into electrical resistance changes that can be measured from the outside, maintaining both the robustness of the composite structure and the visibility of its damage states.
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
Enables easy diagnosis of internal damage and rapid identification of damage location, improving safety by allowing for targeted repairs and reducing the need for replacing entire structures.
Implementation Method 1
it is possible to easily diagnose internal damage occurring during use by using a piezo-resistive characteristic of the graphene layer
Data Source
AI summary
A smart multi-layer composite is disclosed. The smart multi-layer composite includes a plurality of layers stacked in sequence; and a graphene layer interposed between the plurality of layers.