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 2018 → …

Workshop

WorkshopEinladung zur Sitzung des Arbeitskreises Mikrostrukturmechanik im Fachausschuss Computersimulation der DGM
LocationBergischen Universität Wuppertal
CountryGermany
CityWuppertal
Period05/12/2018 → …

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