Capacitive Plate Pairs for Composite Ply Inconsistency Detection
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Solution Overview
Problem
Traditional non-destructive inspection techniques for composite materials like carbon fiber reinforced polymers (CFRP) are unable to detect carbon fiber discontinuities, which affect mechanical strength and electrical conductivity, making it difficult to ensure the quality of composite objects during manufacturing and repair.
Innovation Solution
The use of capacitive plate pairs aligned to measure resistance in different fiber orientations, allowing for noninvasive detection of fiber discontinuities by measuring voltage differentials across the composite object's surface, creating a two-dimensional map of potential ply inconsistencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional non-destructive inspection techniques (ultrasound propagation) are used, then the inspection method is simple and widely available, but the technique cannot detect carbon fiber discontinuities and is only sensitive to ply delamination
Solution Approach 1:
The patent replaces traditional mechanical ultrasound inspection with an electrical measurement system. Capacitive plates are used to measure electrical resistance across the composite material, detecting carbon fiber discontinuities through electrical properties rather than mechanical wave propagation. This substitution enables detection of fiber continuity issues that ultrasound cannot detect.
Solution Approach 2:
The patent changes the measurement parameter from mechanical ultrasound wave propagation to electrical resistance measurement. By measuring resistance in different fiber orientations using capacitive plates, the system can detect carbon fiber discontinuities. The resistance values and their variations across different orientations provide information about fiber continuity and ply inconsistencies.
2Reliability
If multiple plate pairs are used to measure resistance in different fiber orientations, then the detection capability for fiber discontinuity is improved, but the device complexity increases
Solution Approach 1:
The inspection system is segmented into multiple plate pairs, each configured to measure resistance in specific fiber orientations. By dividing the measurement task across multiple oriented plate pairs, the system can comprehensively detect fiber discontinuities in different directions. Each plate pair segment focuses on a specific orientation, and the combined results provide complete coverage.
Solution Approach 2:
The capacitive plate pairs serve multiple functions: they measure resistance in different fiber orientations, detect various types of ply inconsistencies, and provide comprehensive inspection coverage. The same basic plate structure is used repeatedly in different orientations, making the system multi-functional without requiring fundamentally different components for each measurement type.
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 enables efficient identification of ply inconsistencies, ensuring the composite object's mechanical strength and electrical conductivity, thereby enhancing the quality control during manufacturing and repair processes.
Implementation Method 1
each plate pair comprising two capacitive plates aligned to measure a resistance of a plurality of plies in a different fiber orientation
Implementation Method 2
measure a resistance of a plurality of plies in a different fiber orientation
Data Source
AI summary
A plurality of plate pairs that includes at least three plate pairs are positioned over a surface of the composite object. A resistance of a plurality of plies in the composite object is measured in at least three different fiber orientations. Each of the at least three different fiber orientations is measured via a corresponding one of the at least three plate pairs.