A method to measure fracture toughness of the fiber/matrix interface using the single-fiber fragmentation test |
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| Authors: | F.A. Ramirez L.A. Carlsson B.A. Acha |
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| Affiliation: | 1. Department of Mechanical Engineering, Florida Atlantic University, 777 Glades Road, Boca Raton, FL 33431, USA;2. Department of Ocean Engineering, Florida Atlantic University, 101 N. Beach Road, Dania Beach, FL 33004, USA;1. Institute of Materials Chemistry, Faculty of Chemistry, Brno University of Technology, Purkynova 118, CZ-612 00 Brno, Czech Republic;2. Department of Mechanics, Biomechanics and Mechatronics, Czech Technical University, Technicka 4, CZ-166 07 Prague 6, Czech Republic;1. Engineering Department, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, UK;2. Department of Materials Science, Polytechnic University of Madrid, E.T.S. de Ingenieros de Caminos, 28040 Madrid, Spain;3. IMDEA Materials Institute, C/Eric Kandel 2, 28906 Getafe, Madrid, Spain;4. State Key Laboratory of High-performance Complex Manufacturing, Central South University, Changsha 410083, PR China;5. School of Mechanical and Aerospace Engineering, Queen''s University Belfast, Belfast BT9 5AH, UK;1. Department of Chemistry, Inha University, 100 Inharo, Incheon, Republic of Korea;2. Department of Mechanical Engineering, Kyung Hee University, Yongin 446-701, Republic of Korea |
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| Abstract: | A fracture mechanics model was developed for determining the fracture toughness of the fiber/matrix (F/M) interface based on a modified test procedure for the single fiber fragmentation test (SFFT). After loading the specimen until the first fiber fracture and instantaneous debonding events occur, the specimen is unloaded and loaded again until the debond propagates. The critical load for debond propagation is measured and is used with a fracture mechanics analysis to determine the interface fracture toughness. The analysis considers also friction between the fiber and matrix in the debonded region. To obtain the necessary data for calculation of residual radial stress at the F/M interface due to matrix cure shrinkage, simultaneous measurements of dynamic modulus and cure shrinkage were conducted on the matrix (vinylester) during cure. Tests employing E-glass/vinylester SFFT specimens provided fracture toughness values of Gcd = 62 J/m2 (frictionless) and 48 J/m2 (friction). |
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