Fundamental Research on Fracture Prediction Monitoring of Adhesive Bonded Structure using PVDF Film.

PVDF薄膜具有输出电压高、动态负载线性、薄膜几何形状可自由改变等特点。该膜可用作传感器，既不带电源也不带放大器。在这项研究中，应变分布附近的粘接界面测量在以下两种方法-一个与PVDF薄膜和其他与应变计-进行比较。研究了环氧胶粘剂和导电胶粘剂作为粘接剂对测量精度的影响。结果表明，PVDF薄膜的应变测量方法同样适用于粘接问题，并证明了用导电胶粘接PVDF薄膜测得的应变分布趋势与用应变片测得的应变分布趋势相似。

PVDF films have features of high output voltage, linearity for dynamic loads, and flexibility that the film geometry can be changed freely. The film is available as a sensor with neither power sources nor amplifiers. In this study, the strain distribution near adhesive interfaces is measured in the two following methods-one with PVDF films and the other with strain gauges-for comparison. The effect on measurement accuracy is investigated both by epoxy adhesive and conductive adhesive as glue on the joint specimen. As a result, the strain measurement method using PVDF films was also applicable in joining problem by adhesive, and it was proved that the tendency of strain distribution measured with PVDF films bonded by conductive adhesive is similar to that measured with strain gauges.