Optical fibers in composite materials: The effects on mechanical properties under flexural and tensile loading and acoustic emission monitoring

Dzariff Bin Zainal Abidin, Sithila Theminimulla, David Waugh, James Griffin

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    Abstract

    As the demands of materials in practical applications become more sophisticated, multiple technology streams have moved towards a smarter future, incorporating monitoring techniques to validate safety and performance. Optical fiber sensors offer a route to embedded sensing technology within new composite materials, but an understanding of resulting modifications to structural performance following inclusion requires assessment. This work studies three optical fibers (125 μm and 89 μm diameter with dual-layer acrylate coating and 80 μm diameter with polyimide coating) embedded in the composite material. Optical fiber placement and the effects of sensor orientation relative to fiber reinforcement plies, weave configurations, and stacking order considerations under varied load applications are considered and discussed. Empirical results on the effects of fiber coating composition and thickness on composite material samples were collected under flexural and tensile loading. With the aid of non-contact acoustic emissions monitoring, the effects of interfacial interaction between embedded sensors and surrounding composite materials have been assessed compared to elastic wave responses. This considered physical phenomena to map and assess the effects of introducing this structural discontinuity on these materials’ mechanical testing and capability. In doing so, this study adds to a gap in the existing literature by investigating the effects of the multiple variables for fiber sensor embedment in practical applications to move towards smarter material solutions.
    Original languageEnglish
    Pages (from-to)9169-9185
    Number of pages17
    JournalProceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science
    Volume236
    Issue number16
    Early online date6 May 2022
    DOIs
    Publication statusPublished - Aug 2022

    Bibliographical note

    https://creativecommons.org/licenses/by-nc/4.0/This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (https://creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access page (https://us.sagepub.com/en-us/nam/open-access-at-sage).

    Keywords

    • Optical fiber
    • Composite material
    • Acrylate
    • Polyamide
    • Optical fiber coatings
    • damage mechanisms
    • Flexural Test
    • Fiber Interface
    • Tensile Tests
    • Stress analysis

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