Observing the evolution of fatigue damage and associated strain fields in a correlative, multiscale 3D time-lapse study of quasi-unidirectional glass fibre composites

Anuj Prajapati, Ali Chirazi, Lars P. Mikkelsen, Timothy Burnett, Philip J. Withers*

*Corresponding author for this work

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    Abstract

    This research is focused on studying the tension-tension fatigue behaviour of a unidirectional (UD) glass-fibre wind turbine composite. The damage features, their progression and the associated strain fields are tracked in a representative volume by employing a novel correlative approach bringing together x-ray computed tomography (XCT) and digital image correlation (DIC). The focus is on studying ex situ the evolution of damage features (fibre breaks and micro cracks) in an interrupted time-lapse manner. The major drops in stiffness are correlated to the number and location of the damage features in the bulk (XCT) and at the surface (DIC). Results from XCT highlight a localized cluster of fibre breaks and matrix cracks near backing bundles along with axial macro-cracks, while DIC shows that the backing bundles cause regions of higher strain. This highlights the relation between the damage features and strain localisation and their effect on the progressive degradation in stiffness during high cycle fatigue (HCF) cycling.
    Original languageEnglish
    Article number012039
    JournalIOP Conference Series: Materials Science and Engineering
    Volume942
    Issue number1
    Number of pages9
    ISSN1757-8981
    DOIs
    Publication statusPublished - 2020
    Event41st Risø International Symposium on Materials Science - Online event, Denmark
    Duration: 7 Sept 202010 Sept 2020

    Conference

    Conference41st Risø International Symposium on Materials Science
    Country/TerritoryDenmark
    CityOnline event
    Period07/09/202010/09/2020

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