Fracture resistance enhancement in layered composites by the interaction of two cracks – cohesive law scale effects

Stergios Goutianos

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    Abstract

    Through-thickness stresses can cause initiation and propagation of interlaminar cracks, which may lead to a decrease of the structural integrity of a composite component. An example is cracks initiated at ply-drops in wind turbine blades, which can promote delamination under fatigue loading and thus significantly lower the loading capability of the loading structure. The importance of developing composite materials with high damage tolerance (high fracture resistance) will be first illustrated using specimens with multiple ply-drops tested in tension-tension fatigue. It will be shown that the delamination crack growth rate increases with the thickness of the structure, leading to increased crack growth rate as the delamination moves to the thicker section of the specimen. Thus, there is a need to apply techniques that can lead to stable crack growth or crack arrest.
    Original languageEnglish
    Publication date2018
    Publication statusPublished - 2018
    EventEinladung zur Sitzung des Arbeitskreises Mikrostrukturmechanik im Fachausschuss Computersimulation der DGM - Bergischen Universität Wuppertal, Wuppertal, Germany
    Duration: 5 Dec 20185 Dec 2018

    Workshop

    WorkshopEinladung zur Sitzung des Arbeitskreises Mikrostrukturmechanik im Fachausschuss Computersimulation der DGM
    LocationBergischen Universität Wuppertal
    Country/TerritoryGermany
    CityWuppertal
    Period05/12/201805/12/2018

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