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Interlaminar fracture toughness and associated fracture behaviour of bead-filled epoxy/glass fibre hybrid composites

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Abstract

To investigate enhancement of matrix-dominated properties (such as interlaminar fracture toughness) of a composite laminate, two different bead-filled epoxies were used as matrices for the bead-filled epoxy/glass fibre hybrid composites. The plane strain fracture toughness of two different bead-filled epoxies have been measured using compact tension specimens. Significant increases in toughness were observed. Based on these results the interlaminar fracture toughness and fracture behaviour of hybrid composites, fabricated using bead-filled epoxy matrices, have been investigated using double cantilever beam and end notch flexure specimens for Mode I and Mode II tests, respectively. The hybrid composites based on carbon bead-filled matrix shows an increase in both G IC initiation and G IIC values as compared to a glass fibre reinforced plastic laminate with unmodified epoxy matrix. The optimum bead volume fraction for the hybrid composite is between 15% and 20%. However, the unmodified epoxy glass-fibre composite shows a higher G IC propagation value than that of hybrid composites, due to fibre bridging, which is less pronounced in the hybrids as the presence of the beads results in a matrix-rich interply region.

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Authors and Affiliations

  1. Department of Mechanical Engineering, KAIST, 373-1 Kusong-dong, 305-701, Yusung-gu, Taejon, Korea

    Jung Ju Lee

  2. Department of Mechanical Engineering, Kyung-pook National University, Taegu, Korea

    Chang Min Suh

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  1. Jung Ju Lee
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  2. Chang Min Suh
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Lee, J.J., Suh, C.M. Interlaminar fracture toughness and associated fracture behaviour of bead-filled epoxy/glass fibre hybrid composites. Journal of Materials Science 30, 6179–6191 (1995). https://doi.org/10.1007/BF00369665

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  • DOI: https://doi.org/10.1007/BF00369665

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