Fracture mechanism in short fibre reinforced thermoplastic resin composites
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The properties of two types of short carbon fibre (CF) reinforced thermoplastic resin composites (CF-PPS and CF-PES-C), such as strength (σy). Young's modulus (E) and fracture toughness (K1c), have been determined for various volume fractions (Vf) of CF. The results show that the Young's modulus increases linearly with increasingVf with a Krenchel efficiency factor of 0.05, whereas σy andK1c increase at first and then peak at a volume fraction of about 0.25. The experimental results are explained using the characteristics of fibre-matrix adhesion deduced from the load-displacement curves and fractography. By using a crack pinning model, the effective crack tensions (T) have been calculated for both composites and they are 57 kJ m−1 for CF-PPS and 4.2 kJ m−1 for CF-PES-C. The results indicate that the main contribution to the crack extension originates from localized plastic deformation of the matrix adjacent to the fibre-matrix interface.
KeywordsPolymer Plastic Deformation Fracture Toughness Fracture Mechanism Carbon Fibre
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