자갈비산 모니터링을 위한 충격감응

초록

Development of an impact-sensitive-primer using Pb(Ni1/3Nb2/3)O3-Pb(Zr, Ti)O2 (PNN-PZT) piezoelectric material and the commercial epoxy primer for a train was conducted for the flying gravel monitoring of train system. The mixing ratio (weight percent) of PNN-PZT and the epoxy primer is 1: 1, and the mixture of PNN-PZT and epoxy primer ?here, we called impact-sensitive-primer ?were sonicated to disperse the piezoelectric powder homogeneously in the epoxy. In order to apply the impact-sensitive-primer to a train structure, spray coating method was selected for easy and fast coating. Before the impact-sensitive-primer is applied to real trains, aluminum specimens were prepared to check the sensor？s sensitivity. The aluminum specimens were coated in order of the impact-sensitive-primer, the nickel electrode, and the top coating. The specimens were poled with a 4kV/mm electric field for 30 minutes at room temperature. The sensitivity of the impact-sensitive-primer was measured by detecting output voltage from the specimen when an impact hammer hits the specimen. The impact-sensitive-primer was also applied to a real railway vehicle structure and the same manufacturing process and the same testing method was conducted. In conclusion, we confirmed the impact-sensitive-primer can be applicable for flying gravel monitoring.