Fracture mechanism characterization of cross-ply carbon-fiber composites using acoustic emission analysis |
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| Authors: | Y. Mizutani K. Nagashima M. Takemoto K. Ono |
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| Affiliation: | a Faculty of Science and Engineering, Aoyama Gakuin University, 6-16-1, Chitosedai, Setagaya, Tokyo, 157-8572 Japan;b Department of Materials Science and Engineering, UCLA, Los Angeles, CA 90095-1595, USA |
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| Abstract: | The sequence of microscopic fracture mechanisms in locally loaded cross-ply carbon-fiber composites was studied by analyzing acoustic emission (AE) signals in combination with the modal analysis of Lamb waves, using microscopic and ultrasonic examination of the specimen after load interruption. The first 70 AE events were analyzed, which were detected during the initial loading segment when the first sudden load drop and gradual load recovery were observed. Characteristics of the detected waves were compared with the S0- and A0-mode Lamb waves produced by a spot- or line-focused YAG laser. The internal damage progression of the composite specimen was determined to be the fiber fracture in the front lamina, transverse cracks in the mid-lamina, delamination and splitting. |
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| Keywords: | Fracture mechanisms Cross-ply carbon-fiber composites Acoustic emission Lamb wave analysis |
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