X-ray tomographical observations of cracks and voids in 3D carbon/carbon composites |
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| Affiliation: | 1. University of Bordeaux, LCTS, 3 allée de la Boétie, F-33600, Pessac, France;2. CEA, CESTA, 15 Avenue des Sablières, 33114, Le Barp, France;3. von Karman Institute for Fluid Dynamics, Chaussée de Waterloo 72, B-1640, Rhode-Saint-Genèse, Belgium;1. Department of Materials and Metallurgical Engineering, University of Semnan, Semnan, Iran;2. Department of Civil and Resource Engineering, Dalhousie University, Halifax, Nova Scotia, Canada;1. Université de Lyon, LaMCoS UMR 5259, INSA-Lyon, 27 av Jean Capelle, F-69621 Villeurbanne, France;2. Université de Lyon, MATEIS UMR 5510, INSA-Lyon, 25 av Jean Capelle, F-69621 Villeurbanne, France;3. SNECMA, Site de Villaroche, Rond Point René Ravaud - Réau, F-77550 Moissy-Cramayel, France;1. Institute of Engineering Mechanics, Beijing Jiaotong University, Beijing 100044, PR China;2. State Key Laboratory of Turbulence and Complex System, College of Engineering, Peking University, Beijing 100871, PR China |
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| Abstract: | X-ray tomography was used to reconstruct the microstructure of a carbon/carbon (C/C) composite to clearly reveal cracks and voids. The voids are divided into two categories (bubbles and micro-pores), and the cracks are classified into three categories (matrix, intra-bundle, and interfacial). The bubbles were found to account for 2–3% volume in the composite and intra-bundle porosity was in the range of 5–8%. The bubbles are spherical and intra-bundle pores are cylindrical corresponding to structural model index (SMI). A three dimensional (3D) image of the network of cracks and voids was reconstructed for the better visualization. Interfacial cracks on a circular bundle/matrix interface were firstly segmented manually from the composite and special algorithms were used for segmentation and measurement of bundle/matrix interfacial a cracks of circular bundle in the composite. The crack thickness is obtained in the range of 0.012–0.018 mm and percentage debonding 20–50%. |
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