Study on T-bolt and pin-loaded bearing strengths and damage accumulation in E-glass/epoxy blade applications

Alexander JE Ashworth Briggs, Zhong Zhang, Hom Nath Dhakal

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    Abstract

    In this paper, the ultimate bearing strengths of pin-loaded double shear and T-bolt loaded connections were studied in thick composites, where the diameter of the pin equates to the thickness of the laminate. These bearing strengths were obtained for E-glass / Epoxy laminates of [(±45, 03)n ,±45], and a Vf of 54%. It is found that the values for ultimate bearing failure and first non-linearity of pin-loaded connections should be reduced by 25% and 38% respectively, when applied to T-Bolt connections. The failure modes prior to ultimate failure were primarily dominated by fibre matrix shear out and delamination. As far as laminates with specific reinforcement architecture and a large percentage of reinforcement orientated to the load axis are concerned, the long term service life of T-Bolt connections may be impacted due to the visible onset of damage at a similar level to that accepted by Germanischer Lloyd for load introduction zones.
    Original languageEnglish
    Pages (from-to)1047-1056
    JournalJournal of Composite Materials
    Volume49
    Issue number9
    Early online date28 Mar 2014
    DOIs
    Publication statusPublished - 7 Apr 2015

    Keywords

    • Laminate
    • Bearing strength
    • T-bolt
    • Polymer matrix composites (PMCs)
    • Delamination

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