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。这种薄膜可以作为既没有电源也没有放大器的传感器使用。在本研究中，采用以下两种方法-一种是用PVDF薄膜，另一种是用应变片-来测量粘接界面附近的应变分布，以进行比较。研究了环氧胶粘剂和导电胶粘剂分别作为接头试件上胶对测量精度的影响。结果表明，PVDF薄膜应变测量方法同样适用于胶粘剂连接问题，并证明了导电胶粘剂粘合PVDF薄膜测得的应变分布趋势与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.