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The impact of draping effects on the stiffness and failure behavior of unidirectional non-crimp fabric fiber reinforced composites

Kunze, E.; Galkin, S.; Böhm, R.; Gude, M.; Kärger, L.

Abstract:
Unidirectional non-crimp fabrics (UD-NCF) are often used to exploit the lightweight potential of continuous fiber reinforced plastics (CoFRP). During the draping process, the UD-NCF fabric can undergo large deformations that alter the local fiber orientation, the local fiber volume content (FVC) and create local fiber waviness. Especially the FVC is affected and has a large impact on the mechanical properties. This impact, resulting from different deformation modes during draping, is in general not considered in composite design processes. To analyze the impact of different draping effects on the mechanical properties and the failure behavior of UD-NCF composites, experimental results of reference laminates are compared to the results of laminates with specifically induced draping effects, such as non-constant FVC and fiber waviness. Furthermore, an analytical model to predict the failure strengths of UD laminates with in-plane waviness is introduced. The resulting stiffness and strength values for different FVC or amplitude to wavelength configurations are presented and discussed. In addition, failure envelopes based on the PUCK failure criterion for each draping effect are derived, which show a clear specific impact on the mechanical properties. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000122794
Veröffentlicht am 09.09.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Fahrzeugsystemtechnik (FAST)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 02.07.2020
Sprache Englisch
Identifikator ISSN: 1996-1944
KITopen-ID: 1000122794
Erschienen in Materials
Verlag MDPI
Band 13
Heft 13
Seiten Art. Nr.: 2959
Schlagwörter unidirectional non-crimp fabrics, draping effects, deformation modes, mechanical properties, fiber volume content, waviness, inter fiber failure, failure envelopes, gapping, shearing
Nachgewiesen in Dimensions
Web of Science
Scopus
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