レイリー散乱型分布センサによるFRPの成形および損傷モニタリング

抄録

In the present study, feasibility studies of process and health monitoring of FRP by Rayleigh-scattering based distribution optical fiber sensors were conducted. In the process monitoring, flow front of resin impregnation and process-induced strain were measured. Comparing to visual observation results, it appeared that the minimum peak of the strain curves shows arrival of flow front of resin. From the strain curves after start of heating process, the sensor could measure thermal strain., curing shrinkage and thermal shrinkage. In the health monitoring, damage identification of cross-ply GFRP laminates with delamination by the attached distribution optical fiber sensors was carried on. Figure 3 illustrates GFRP laminates with delamination for three points bending tests. The number of layers was 11 and the stacking sequence was [0/90/0/…/0]. Three types of specimens, no delamination, delamination between 5 and 6 layers and delamination between 10 and 11 layers were prepared. The distribution sensor was attached on the bottom surface. Therefore, it can be concluded that the Rayleigh-scattering based sensors could monitor impregnation and distribution of process-induced strain during molding process and development of delamination in operation.