Optimal Electrode Selection for Electrical Resistance Tomography in Carbon Fiber Reinforced Polymer Composites

Electrical Resistance Tomography (ERT) offers a non-destructive evaluation (NDE) technique that takes advantage of the inherent electrical properties in carbon fiber reinforced polymer (CFRP) composites for internal damage characterization. This paper investigates a method of optimum selection of se...

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Bibliographic Details
Published in:Materials 2017-02, Vol.10 (2), p.125
Main Authors: Escalona Galvis, Luis Waldo, Diaz-Montiel, Paulina, Venkataraman, Satchi
Format: Article
Language:English
Subjects:
Carbon fiber reinforced plastics
Carbon fiber reinforcement
Damage detection
Delamination
Electrical properties
Electrical resistance
Electrodes
Fiber composites
Fiber reinforced polymers
Finite element method
Laminates
Modal analysis
Nondestructive testing
Optimization
Polymer matrix composites
Potential fields
Reduction
Singular value decomposition
Tomography
Vibration analysis
Vibration measurement
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Summary:Electrical Resistance Tomography (ERT) offers a non-destructive evaluation (NDE) technique that takes advantage of the inherent electrical properties in carbon fiber reinforced polymer (CFRP) composites for internal damage characterization. This paper investigates a method of optimum selection of sensing configurations for delamination detection in thick cross-ply laminates using ERT. Reduction in the number of sensing locations and measurements is necessary to minimize hardware and computational effort. The present work explores the use of an effective independence (EI) measure originally proposed for sensor location optimization in experimental vibration modal analysis. The EI measure is used for selecting the minimum set of resistance measurements among all possible combinations resulting from selecting sensing electrode pairs. Singular Value Decomposition (SVD) is applied to obtain a spectral representation of the resistance measurements in the laminate for subsequent EI based reduction to take place. The electrical potential field in a CFRP laminate is calculated using finite element analysis (FEA) applied on models for two different laminate layouts considering a set of specified delamination sizes and locations with two different sensing arrangements. The effectiveness of the EI measure in eliminating redundant electrode pairs is demonstrated by performing inverse identification of damage using the full set and the reduced set of resistance measurements. This investigation shows that the EI measure is effective for optimally selecting the electrode pairs needed for resistance measurements in ERT based damage detection.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma10020125