Abstract
The fracture behavior and interfacial properties of single fiber composites (SFC) containing a single optical fiber are examined by acoustic emission and a polarized microscope in a monotonous tensile and bending test. As a result, in both tests, initial and main AE events occur in an earlier loading region, and near the peak loading point, respectively. Fiber fragment length can be expressed by Weibull distribution. However, the differences in these two tests are clearly seen in AE activity patterns, amplitude distributions, power spectra, and fiber fragment distributions. the shape parameter of a Weibull distribution in the bending test is 5.7, which is about twice as large as that in the tensile test. This means a smaller dispersion of fiber fragment length in the bending test than in the tensile one. A transition of failure modes due to tensile, compressive, or shear stresses or a combination of these is found by changing the fiber position along the thickness direction of a specimen in the bending test. Variance of AE characteristics and fracture behavior at a fiber breakage can also be observed for different fiber positions.
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