金属基圧電複合材料の高ひずみ領域における出力特性

抄録

Metal-core piezoelectric fiber/aluminum composite is expected as a candidate of sensor used for structural health monitoring (SHM). In SHM, even if a large load is applied to a structure due to a disaster such as earthquake, the sensors are required to function. This composite material with high mechanical properties is thought to be suitable for its use, however, the characteristics in such a large strain region are not clear. In this study, the output of this composite when applied tensile vibration was evaluated material and the output characteristics of this composite in the large strain region were clarified. As a result, it was found that this composite works even at extremely high strain of about 20%. In addition, it was found that it can be classified into the first stage, which decreases with increasing strain added by the output, and the second stage, which is almost constant output regardless of the strain increase / decrease. Finite element analysis revealed that the decrease in the output of the first stage is caused by the stress reduction occurring in the piezoelectric ceramics due to the fracture of the piezoelectric ceramics. And it is considered that the constant output in the second stage is caused by the stress transmitted from the matrix becomes constant due to fragmentation of the piezoelectric ceramics.