フレキシブルマトリックスセンサを用いたCFRP積層板多点成形モニタリング

抄録

Since CFRP structure becomes complicated due to adoption of integral molding, local molding faults such as under cure and dry spot are liable to occur. For solving this problem, it is demanded to measure the distribution of cure-degree of whole composite structure. In the present study, we propose a patch-type flexible matrix sensor based on permittivity measurements. Multiple electrodes and wirings are readily fabricated at one time using a photolithographihc process. Moreover, the sensor has only m+ n wirings for m× n sensors, and is thereby suitable for the multipoint cure monitoring. We also constructed the method of estimating degree of cure considering effect of frequency dependence of permittivity of resin and viscosity variation due to temperature change. Experiments of multipoint cure monitoring are carried out using a CFRP plate and an actual aircraft structure. As a result, we confirmed the effectiveness of this method by comparing with the conventional differential scanning calorimeter.