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Experimental study of defect formation during processing of randomly-oriented strand carbon/PEEK composites
Affiliation:1. The University of Tokyo, Department of Systems Innovation, Hongo 7-3-1, Bunkyo-ku, Tokyo, Japan;2. KU Leuven, Department of Materials Engineering, Kasteelpark Arenberg 44, B-3001 Leuven, Belgium;1. Advanced Composites Centre for Innovation and Science, University of Bristol, Queen’s Building, Bristol BS8 1TR, United Kingdom;2. The Composites Centre, Department of Mechanical Engineering, South Kensington Campus, Imperial College London, London SW7 2AZ, United Kingdom;3. The Composites Centre, Department of Aeronautics, South Kensington Campus, Imperial College London, London SW7 2AZ, United Kingdom;1. The University of Tokyo, Department of Systems Innovation, Hongo 7-3-1, Bunkyo-ku, Tokyo, Japan;2. KU Leuven, Department of Materials Engineering, Kasteelpark Arenberg 44 B-3001, Leuven, Belgium;1. Department of Mechanical Engineering, McGill University, 817 Sherbrooke Street West, Montreal, QC, Canada H3A 0C3;2. National Research Council Canada, 5145 Decelles Avenue, Montreal, QC, Canada H3T 2B2;1. Université de Toulouse, CNRS, Mines Albi, INSA, UPS, ISAE-SUPAERO, ICA (Institut Clément Ader), Campus Jarlard, F-81013 Albi, France;2. NIMITECH Innovation, LAUAK Group, 1 avenue des Victimes du 11 Juin 1944, F-65200 Bagnères de Bigorre, France;3. Université de Toulouse, LGP-ENIT-INPT, F-65016 Tarbes, France
Abstract:An investigation of the moulding defects formed during compression moulding of randomly-oriented strand carbon/PEEK composites is presented. The cause of defect formation was identified as non-uniform shrinkage due to a high coefficient of thermal expansion at the onset of crystallization. Panels with void content ranging from 0% to 1.3% were moulded by releasing the moulding pressure at specific temperatures during the cooling process. Mechanical tests showed a reduction in specimen compressive strength from 15% to 25% for a void content of 0.63–1.3%. It was concluded that the high concentration of porosity near the surface of the panels was the likely cause of the strength reduction.
Keywords:A  Discontinuous reinforcement  E  Compression moulding  B  Porosity  D  Mechanical testing
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