Novel Design of Cocured Composite ‘T’ Joints with Integrally Woven 3D Inserts

Kundan , K Verma and Sandeep, DN and Sugun, BS and Athimoolaganesh, S and Kotresh, Gaddikeri M and Ramesh, Sundaram (2013) Novel Design of Cocured Composite ‘T’ Joints with Integrally Woven 3D Inserts. In: 5th World Conference on 3D Fabrics and Their Applications, 16-17 Dec 2013, Delhi, India,.

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    Abstract

    Composites can be exploited to their full potential when cocured, wherein different parts are made and bonded together in a single cure operation to realise an integral structure. The key element in a typical cocured construction is T-joint, which forms the primary load transfer mechanism between the skin and stiffener in a structural assembly. T-joints are particularly vulnerable for pull off loads and researchers are looking at various techniques to improve the pull strength viz. stitching, tufting, 3D weaving, multilayer weaving, 3D braiding and the like. The present work uses a novel technique to improve the strength of T-joints by employing a hybrid design wherein an integral 3D ‘T’ insert is interleaved with a conventional T-joint. Inserts were woven using 3K and 6K carbon tows and incorporated in T-joints using CSIR-NAL proprietary process called ‘Vacuum Enhanced Resin Infusion Technology (VERITy)’ process. Several configurations of T-joints were tested in an UTM in the pull mode till the failure to assess the efficacy of integrally woven 3D inserts. It was observed that the initial failure load was nearly the same across the various T-joint configurations tested whereas the maximum failure loads were quite different. The normalised strength of T-joints with integrally woven 3D inserts in pull off mode was enhanced by about 30% when compared T-joints without the insert and thus vindicating the usage of integrally woven 3D insert in a cocured T-joint. The insert is conceived in such a way that it can be easily incorporated in the design of cocured structures.

    Item Type: Conference or Workshop Item (Paper)
    Uncontrolled Keywords: T-joints, cocuring, pull off strength, VERITy, 3D ‘T’ inserts
    Subjects: CHEMISTRY AND MATERIALS > Composite Materials
    Division/Department: Advanced Composites Division, Other, Fibre Reinforced Plastics Division, Advanced Composites Division, Advanced Composites Division, Advanced Composites Division
    Depositing User: Mr. BS Shivaram
    Date Deposited: 19 Dec 2013 11:52
    Last Modified: 24 Dec 2013 13:47
    URI: http://nal-ir.nal.res.in/id/eprint/11875

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