光ファイバを用いたFRP積層板の衝撃損傷検出試験

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In the present paper, the impact induced behaviors of composite laminates were observed by internal monitoring with the embedded fiber optic sensors. The impact induced damage such as delaminations and cracks were detected by sensing the fracture of embedded optical fibers. To establish methods for independently sensing cracks and delaminations, the embedded directions of the optical fibers were changed in various ways. In the delamination detection, optical fibers were curved and embedded along each reinforcing direction in[0゜_4/90゜_4]_s laminates. To detect cracks, optical fibers were embedded between 90゜ layers, perpendicularly in the reinforcing direction. First, the delamination detection technique was evaluated by the static indentation tests. The tests were conducted with real-time observation of the damage propagation and the fracture of optical fibers using a CCD camera. As these test results, it was proved that optical fiber was broken when the delamination growth was reached within a certain region of the specimen. Second, the falling weight impact tests were conducted with various impact energies. Two optical fibers were embedded in each specimen;one was for crack detection, another was for delamination detection. As the results of the impact tests, it was found that cracks at the middle layer of specimen occurred at the initial stage of impact loading, and then the delaminations at the lower interfaces propagared.
社団法人日本材料学会の論文
1995-09-15

光ファイバを用いたFRP積層板の衝撃損傷検出試験

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