| Title |
Development of a PVDF Film-based Strain-piezoelectric Fused Hybrid Crack Sensor for Concrete Crack Detection and Displacement Measurement |
| Authors |
김민규(Minkyu Kim) ; 함광근(Kwangkeun Ham) ; 양승열(Seungyhul Yang) |
| DOI |
https://doi.org/10.5573/ieie.2026.63.1.89 |
| Keywords |
Concrete structure; Crack detection; PVDF film; Strain-piezoelectric fusion |
| Abstract |
This study developed a polyvinylidene fluoride (PVDF) film-based strain-piezoelectric integrated hybrid crack sensor to enable simultaneous detection of dynamic crack activity and static crack progression, which is essential for concrete structural health monitoring. The sensor’s static strain detection performance showed excellent linearity, with high coefficients of determination (R² > 0.99) for both electrodes across the strain range (0.0 mm to 8.0 mm), and gauge factors (GF) of 14.397 and 15.693, respectively. Regarding frequency response characteristics for dynamic signals, the sensor exhibited a maximum peak at the applied frequency for vibrations induced at 10 Hz intervals from 20 Hz to 100 Hz. Signal-to-noise ratio (SNR) value ranging from 17.8 dB to 29.2 dB confirmed its high measurement sensitivity and detection accuracy. Furthermore, in the external-impact detection performance evaluation, both the maximum amplitude and the signal duration increased with impact strength, and regression analyses yielded coefficients of determination (R²) of 0.969 and 0.993, demonstrating the feasibility of detecting external impacts and quantifying their strength. These results confirm that the hybrid crack sensor developed in this study can simultaneously detect static displacement and dynamic signals. Therefore, this sensor is expected to overcome the limitations of existing single-function sensors and provide an efficient solution for comprehensive structural health monitoring of concrete structures. |