• Behaviour of 𝐸-glass fibre reinforced vinylester resin composites under impact fatigue

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      https://www.ias.ac.in/article/fulltext/boms/024/02/0137-0142

    • Keywords

       

      Impact fatigue; static fatigue; residual stress; 𝐸-glass fibre; vinylester resin.

    • Abstract

       

      An impact fatigue study has been made for the first time on 63.5% glass fibre reinforced vinylester resin notched composites. The study was conducted in a pendulum type repeated impact apparatus especially designed and fabricated for determining single and repeated impact strengths. A well-defined impact fatigue (S–N) behaviour, having a progressive endurance below the threshold single cycle impact fracture stress with decreasing applied stress has been demonstrated. Fractographic analysis revealed fracture by primary debonding having fibre breakage and pullout at the tensile zone, but a shear fracture of fibre bundles at the compressive zone of the specimen. The residual strength, modulus and toughness showed retention of the properties at high impact stress levels up to 1000 impacts followed by a sharp drop. Cumulative residual stresses with each number of impacts not withstanding the static fatigue failure at long endurances have been ascribed for the composite failures under the repeated impact stresses.

    • Author Affiliations

       

      Rita Roy1 2 B K Sarkar1 2 N R Bose1 2

      1. Department of Material Science, Indian Association for the Cultivation of Science, Kolkata 700 032, India
      2. Central Glass and Ceramic Research Institute, Kolkata 700 032, India
    • Dates

       
  • Bulletin of Materials Science | News

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