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Fatigue behaviour in hybrid hollow microspheres/fibre reinforced composites

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Abstract

This article presents the results of a current study concerning the influence of the addition of short fibres on the fatigue behaviour of syntactic foams. The material was obtained by vacuum-assisted resin transfer moulding adding hollow glass microspheres to an epoxy resin acting as binding matrix. Specimens with microsphere contents up to 50% and fibre reinforcement up to 1.2% in volume were tested at three-point bending at room temperature. Foams show significantly lower static and fatigue strength than an epoxy matrix. A significant decrease in the absolute strength with filler increase was observed, and even specific strength decreases for low filler contents and is nearly constant for the higher filler contents. Fatigue strength also decreases with the increase in filler content. The addition of glass fibre reinforcement produces only a slight improvement in flexure strength, while the addition of carbon fibres promotes an important improvement; a hybrid composite containing 0.9% carbon fibre is about 30% stronger than unreinforced foams. An improvement in fatigue strength more than 30% was obtained by the addition of small percentages of glass or carbon fibre.

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Acknowledgements

The authors thank the financial support of the Portuguese Foundation to Science and Technology, for funding the Project nº PTDC/EME-PME/66549/2006.

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Authors and Affiliations

  1. CEMUC, Mechanical Engineering Department, University of Coimbra, Polo II da Univ. de Coimbra, Pinhal de Marrocos, 3030-788, Coimbra, Portugal

    J. A. M. Ferreira, K. Salviano & J. D. Costa

  2. CDRsp, Centre for Rapid and Sustainable Product Development, Polytechnic Institute of Leiria, Morro do Lena, Alto Vieiro, 2400-901, Leiria, Portugal

    C. Capela

Authors
  1. J. A. M. Ferreira
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  2. K. Salviano
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  3. J. D. Costa
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  4. C. Capela
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Correspondence to J. A. M. Ferreira.

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Ferreira, J.A.M., Salviano, K., Costa, J.D. et al. Fatigue behaviour in hybrid hollow microspheres/fibre reinforced composites. J Mater Sci 45, 3547–3553 (2010). https://doi.org/10.1007/s10853-010-4397-4

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  • DOI: https://doi.org/10.1007/s10853-010-4397-4

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