Real-Time Measurement of Internal Strain in FRP Laminates with Optical Fiber Sensors in Autoclave Molding

In the present study, real-time measurement of internal and residual strains in GFRP laminates with an optical fiber strain sensor was performed in an autoclave molding. An Extrinsic Fabry-Perot Interferometric (EFPI) type optical fiber strain sensor was embedded into prepreg sheets before the moldi...

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Bibliographic Details
Published inTransactions of the Japan Society of Mechanical Engineers Series C Vol. 63; no. 615; pp. 3715 - 3721
Main Authors OSAKA, Katsuhiko, JIANG, Jianye, FUKUDA, Takehito, MOTOGI, Shinya, TSUKATANI, Hisashi, KITADE, shintarou
Format Journal Article
LanguageJapanese
Published The Japan Society of Mechanical Engineers 25.11.1997
Subjects
Autoclave Molding
High Polymer Materials
Internal Strain
Ion Viscosity
Optical Fiber
Reinforced Plastics
Residual Stress
Thermal Stress
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Summary:In the present study, real-time measurement of internal and residual strains in GFRP laminates with an optical fiber strain sensor was performed in an autoclave molding. An Extrinsic Fabry-Perot Interferometric (EFPI) type optical fiber strain sensor was embedded into prepreg sheets before the molding. The ion viscosity and the temperature of the epoxy resin matrix were also measured simultaneously with the internal strain measurement. The results of the experiments showed that the internal and residual strain of GFRP laminates during the molding could be monitored by the optical fiber sensor embedded in the parallel direction to the reinforcing fibers. It was also found that the circumstances around the embedded optical fiber strain sensor should be taken into account for the interpretation of the measured internal and residual strain.
ISSN:0387-5024
1884-8354
DOI:10.1299/kikaic.63.3715