Wireless Strain Monitoring of CFRP Laminates Using Electric Resistance Change with Oscillating Circuit

Roysuke Matsuzaki; Akira Todoroki

doi:10.4028/www.scientific.net/KEM.326-328.1415

Paper Titles

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Behavior of Lightweight Piezoceramic Composite Actuator under Compressive Load
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Structural Design of Piezoelectric Actuator Considering Polarization Direction and Continuous Approximation of Material Distribution
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A Study on the Actuating Performance of Unimorph Piezoelectric Actuators with a Center Load
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Wireless Strain Monitoring of CFRP Laminates Using Electric Resistance Change with Oscillating Circuit
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Experimental Investigation of Smart Hull Structures Based on Macro Fiber Composite Actuators
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Noise Effect on Estimation Accuracy of Delamination Monitoring Methods for CFRP Laminate Using Electric Property Change
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Performance Evaluation of the Embedded System for Automated Manual Transmissions Using Test Rig
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Development and Evaluation of a Contacting Force Measurement System in a High Temperature and Pressure Water Condition for Fretting Wear Experiments
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Wireless Strain Monitoring of CFRP Laminates Using Electric Resistance Change with Oscillating Circuit

Abstract:

To identify a delamination crack in a CFRP laminate wirelessly, we proposed an electric resistance change method with oscillating circuit in the previous study. Although the method detects the delamination creation, it cannot monitor condition of applied strain before delamination creation because the electric resistance change due to strain changing is quite small. In the present study, a bridge circuit, two amplifiers and voltage-controlled oscillator are added to sensing circuit so that it can monitor very little change of the electric resistance change. Using proposed strain sensing system, the electric resistance change and oscillating frequency change due to strain changing are experimentally measured. As a result, the method is found to successfully monitor the applied strain.