The Material Intellectualization in addition to the Detection of the Fatigue Crack by using piezoelectric polymer film gages

压电聚合物薄膜压力计(PVDF)力输出电压大。因此，在测量系统中不需要放大器。利用这一特性进行了研究，主要目的如下：(1)利用压电式聚合物薄膜传感器进行疲劳裂纹扩展测量实验。在疲劳裂纹扩展测量中，实验表明，压电式聚合物膜片片与裂纹片片的测量结果基本一致。(2)提出了由压电式聚合物薄膜压电计的输出电压计算疲劳裂纹长度的方法。推导了由压电式压电式聚合物薄膜压力计的输出电压计算疲劳裂纹长度的公式。(3)研制了一种检测疲劳裂纹产生的压电式压力计。该压电式压电式压力式压电式压力计是通过将压电式聚合物薄膜的裂纹形状切割成与其圆孔曲率相适应的形状而产生的，具有很好的一致性用本研究中研制的疲劳裂纹长度测量值和裂纹测量仪进行观察。(4)利用压电聚合物薄膜，制作了应变片，并进行了应变测量。从压电聚合物薄膜的基本方程出发，推导出了应变分析的形式，并进行了实验，并与实际应变片进行了比较，得到了两者相同的趋势。

Piezoelectricity polymer thin film gage (PVDF) force output voltage large. therefore, the amplifier is not required in the measurement system. The research was carried out using such property with the purpose of the following.(1) The execution of fatigue crack propagation measurement experiment using the piezoelectricity polymer thin film gage. In the fatigue crack propagation measurement, it was shown experimentally that the result between piezoelectricity polymer film gage and crack gage agreed. It was proven that pot piezoelectricity polymer film gage could use for the fatigue crack propagation measurement.(2) The development of the calculation method of the fatigue crack length from output voltage of the piezoelectricity polymer thin film gage.The formula of the fatigue crack length was developed from the output voltage of the piezoelectricity polymer film gage.(3) Crack gage was developed which detected the generation of the fatigue crack which Arose from stress concentration zone such as the circular whole edge.It was produced by cutting the shape of the crack gage in the shape that suited the circular hole curvature the piezoelectricity polymer thin film.The good coincidence was observed by measured value and crack gage developed in this study of the fatigue crack length.(4) Using the piezoelectricity polymer thin film, the strain gauge was made and the strain measurement was tried. The strain analysis style was deduced from the fundamental equation of the piezoelectricity polymer thin film.As the result that it carried out the experiment and compared with actual strain gage the tendency equal to both was obtained.