| 초록 |
Conventional piezoelectric lead-zirconate-titanate (PZT) senor has high sensitivity, but it is brittle. Recently polymer films such as polyvinylidene fluoride (PVDF) and copolymer-PVDF have been used use as a sensor. The advantages of PVDF are the flexibility and mechanical toughness. Simple embedding process and possible several shapes are also additional advantages. In this study, the sensitivity for single fiber reinforced epoxy composite with PVDF and copolymer-PVDF sensors was investigated using fragmentation test and acoustic emission (AE). AE parameters such as AE energy and amplitude for fiber fracture detected by PVDF sensor were compared to copolymer-PVDF sensor case relating to their thermal and mechanical properties, and then they were correlated with PZT sensor. For both PVDF and copolymer-PVDF sensors, AE energy and amplitude were lower than PZT sensor case due to their dissipation of elastic wave. Sensitivity of PVDF sensor for fiber fracture was almost same as copolymer-PVDF sensor, whereas AE energy and amplitude was rather higher in PVDF sensor. Acknowledgement: This study was supported financially by KOSEF through the Research Center for Aircraft Parts Technology (ReCAPT), GNU. |
