S0302-3-5 ラマン分光法を用いた破壊過程におけるCFRPの応力マッピング(実験力学における計測・解析法の新展開(3))

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In this study, stress mapping measurement of carbon fiber around an interlaminar crack in FRP was conducted by Raman micro spectroscopy. Raman micro-spectroscopy was based on confocal microscope, stress on small area less than 1.0 μm in diameter was able to be measured. Tensile tests of single carbon fiber with 4.4 μm in diameter were conducted by micro tensile testing machine, and the relationships of 2700 cm^<-1> Raman line between Raman shift change and applied stress had the most high stress resolution and the good linearity. Therefore, residual stresses and the phase stresses of fibers around a crack tip in DCB specimen were determined by this relationship. The carbon fiber in several micrometer depth from the specimen surface had high compressive stress, but stress on surface was high tensile stress. In DCB tests, the increase of fiber stress round a crack tip was observed under mode I loading.
2009-09-12