Nondestructive Evaluation and Mechanical Characterization of a Defect-Embedded Ceramic Matrix Composite Laminate
A C/SiC composite panel with defects of known size and of familiar nature was manufactured successfully for nondestructive evaluation. A computed tomography (CT) system was used to detect embedded defects. The results show that CT imaging corresponds well with the designed defects. The defect-embedded composites undergo relatively greater loss in tensile strength and failure strain than the as-received samples, although their initial Young's moduli are almost identical. It is also observed that the embedded defects make a significant contribution toward the initiation and accumulation of the damage in the composites, which result eventually in the early failure of the composite.
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Document Type: Research Article
Affiliations: National Key Laboratory of Thermostructure Composite Materials, Northwestern Polytechnical University, Xi'an Shaanxi 710072, China
Publication date: 2007-08-01