The Behavior of Crack Propagation and Acoustic Emission in CFRP Fabric Mono-lamina Composites under In Situ SEM.

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  • その場ＳＥＭ観察におけるＣＦＲＰ織物単層板のき裂進展挙動とＡＥ特性
  • ソノバ SEM カンサツ ニ オケル CFRP オリモノ タンソウバン ノ キ

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The fracture behavior and crack propagation process of carbon fiber fabric mono-lamina composites are examined by in situ SEM, and acoustic emission (AE) signals are measured simultaneously. As a result, crack propagation and patterns of AE event count rate strongly depend on fabric structures. It is shown that the position of a notch relative to a fabric texture unit has an influence on the occurrence of an initial crack and crack propagating paths, particularly for the materials with plain or twill texture. The crack propagates along one direction in a texture unit, and the fiber strands in the unit like a frame preventing a crack from propagating beyond the unit. However, when the deformation becomes large the crack occurring within the texture unit continues to propagate by circumventing the cross section of strands. There exist two fracture forms for a carbon strand, separation of the strand and fiber breakage. Corresponding to these two forms, the spectrum peaks achieved by the power spectrum analysis of AE signals are about 150kHz and 400kHz, respectively.

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