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。利用这种特性进行研究的目的如下。(1)采用压电聚合物薄膜计进行疲劳裂纹扩展测量实验。在疲劳裂纹扩展测量中，实验表明压电聚合物薄膜计与裂纹计的测量结果吻合。实验证明，压电聚合物薄膜计可以用于疲劳裂纹扩展的测量。(2)发展了基于压电聚合物薄膜计输出电压的疲劳裂纹长度计算方法。根据压电聚合物薄膜计的输出电压，推导出疲劳裂纹长度的计算公式。(3)研制了裂纹计，用于检测圆形整边等应力集中区域产生的疲劳裂纹。它是通过在压电聚合物薄膜上切割与圆孔曲率相适应的裂纹计形状而产生的。本文所研制的疲劳裂纹长度测量仪与实测值吻合较好。(4)利用压电聚合物薄膜制作应变片，并进行应变测量试验。从压电聚合物薄膜的基本方程出发，推导出应变分析方法。通过实验，并与实际应变计进行了比较，得到了两者相等的趋势。

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.