Electrically conductive assembly
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Solution Overview
Problem
Carbon fiber composites used in structural components like airplanes and vehicles are prone to sudden failure due to delamination or internal cracks from stress cycling and environmental degradation, which can lead to catastrophic failure if faults are not detected in time.
Innovation Solution
Incorporating magnetite particles into electrically conductive composite materials allows for the measurement and monitoring of stresses, with the magnetite particles being distributed between conductive elements such as carbon fibers, enabling a change in resistance and capacitance in response to pressure, facilitating the detection of material faults through signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetite particles are incorporated into non-conductive binder matrices, then electrical conduction sensitivity to pressure is improved, but the ability to transmit signals remotely is worsened
Solution Approach 1:
The patent combines magnetite particles with conductive elements (carbon fibers, graphite, conductive polymers) within the same composite matrix, merging the pressure-sensitive properties of magnetite with the signal transmission capability of conductive materials. This allows the composite to both sense pressure changes and transmit electrical signals remotely.
Solution Approach 2:
The invention creates a multi-component composite material system comprising magnetite particles, conductive elements, and binder matrix. This composite structure integrates the advantages of each component: magnetite provides pressure sensitivity, conductive elements provide signal transmission, and the binder provides structural integrity.
2Strength
If carbon fiber composites are used for structural strength, then mechanical strength is improved, but the ability to detect internal faults is worsened
Solution Approach 1:
The patent introduces magnetite particles as intermediary sensing elements distributed within the carbon fiber composite structure. These particles act as mediators that convert mechanical stress changes into electrical signal changes, enabling indirect detection of internal faults without compromising the structural integrity of the carbon fiber composite.
Solution Approach 2:
The composite material provides real-time feedback through electrical resistance changes that correspond to internal stress and strain conditions. This allows continuous monitoring of the structural health, enabling early detection of delamination, cracks, or other internal faults before they lead to catastrophic failure.
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 integration of magnetite particles into carbon fiber composites enables real-time monitoring of stress changes, allowing for early detection of material faults and preventing catastrophic failures by providing an electrically anisotropic pressure-sensitive response.
Implementation Method 1
the resistance and/or capacitance of the electrically conductive assembly changing in accordance with the pressure exerted thereon
Implementation Method 2
composites comprising polymer binder matrixes containing quantities of magnetite particles can demonstrate electrical conduction ranges which can be varied over many orders of change by the application of mechanical pressure or electrical voltage
Data Source
AI summary
An electrically anisotropic pressure sensitive assembly comprises a contained quantity of electrically conductive particles including first electrically conductive particles, which first electrically conductive particles are magnetite particles, wherein the quantity of magnetite particles includes a distribution of particle sizes between sub-micron and tens of microns. The magnetite particles have a plurality of planar faces, adjacent planar faces connected at a vertex, the particles each having a plurality of vertices wherein the magnetite particles are irregular in shape. The resistance and/or capacitance of the electrically conductive assembly changes in accordance with the pressure exerted thereon. The assembly includes at least two electrically conductive elements, the quantity of electrically conductive particles being contained in interstices between the at least two electrically conductive elements.