Micromechanical Investigation of Fatigue Damage in Uni-Directional Fibre Composites

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Abstract

In this study, 3D x-ray computed tomography (XCT) is used to study fatigue damage mechanisms of a uni-directional (UD) glass fibre composite used in wind turbine blades. The challenges related to using 3D XCT for fatigue damage assessment over time is outlined, and a cut-out of a specimen previously subjected to tension-tension fatigue loading is examined. Broken UD load-carrying fibres are observed locally close to the thin off-axis backing support layers and are spreading out in a local damage zone in the UD bundle close to the backing. The common factors of the fatigue damaged regions found in this study were intertwining backing bundles in direct contact with the UD bundle and a locally high fibre volume fraction at the backing. Other factors like fibre misalignment and fibre radii could have an effect; however this is not obvious from the obtained results. Further studies on a larger dataset should be performed to examine this in more detail.
Original languageEnglish
Title of host publicationProceedings of 6th International Conference on Fatigue of Composite
Number of pages10
Publication date2015
Publication statusPublished - 2015
Event6th International Conference on Fatigue of Composite - Musée de l'Air et de l'Espace, Paris, France
Duration: 25 Mar 201527 Mar 2015
Conference number: 6

Conference

Conference6th International Conference on Fatigue of Composite
Number6
LocationMusée de l'Air et de l'Espace
Country/TerritoryFrance
CityParis
Period25/03/201527/03/2015

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