その場SEM観察におけるCFRP積層材のき裂進展挙動とAE特性

概要

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The fracture behavior and crack propagation process of carbon-fiber-reinforced laminate composites are examined by in situ SEM, and acoustic emission (AE) signals are measured simultaneously. As a result, the fractures of matrix, fiber-matrix interface and bridge fiber give rise to AE signals, and the patterns of AE event count rate are found to depend strongly on the fiber orientation in a laminate. The direction of crack propagation is along the fiber orientation even for cross laminates and crack propagation is terminated by the reinforced fibers. The amplitude of the AE signal is low at the period of initial crack occurrence, but becomes high and the number of AE events increases rapidly as the crack propagates. This means that microfractures in the material increase during crack propagation. This result can also be confirmed by the results of an AE power spectrum analysis. Furthermore, by matching AE signals to the fractographs, it is found that AE activity is weak and has a low amplitude in the region of a flat fracture surface, while it is strong and has a high amplitude in the rough surface region, especially for a unidirectional material A.
一般社団法人日本機械学会の論文
1996-01-25