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Effective stiffness of curved 0°-layers for stiffness determination of cross-ply non-crimp fabric composites
Lulea University of Technology.
RISE, Swerea, Swerea SICOMP.
Ecole Européenne D'Ingénieurs en Génie des Matériaux.
Lulea University of Technology.
2014 (English)In: Journal of reinforced plastics and composites (Print), ISSN 0731-6844, E-ISSN 1530-7964, Vol. 33, no 14, 1339-1352 p.Article in journal (Refereed)
Abstract [en]

The effect of the 0°-tow waviness on axial stiffness of cross-ply non-crimp fabric composites is analysed using multiscale approach. The curved 0°- and 90°-layers are represented by flat layers with effective stiffness properties and classical laminate theory is used to calculate the macroscopic stiffness. The effective 0°-layer stiffness is calculated analysing isolated curved 0°-layers subjected not only to end loading, but also to surface loads. The surface loads are identified in a detailed finite element analysis and approximated by a sinus shaped function with amplitude depending on the waves parameters. The sinus shaped surface loads are then applied to an isolated curved 0°-layer finite element model together with end loading to calculate the effective stiffness of the layer. Finally, the effective 0°-layer stiffness was successfully used to calculate the macroscopic stiffness of the composite proving validity of the approach being used and showing that, without losing accuracy, elastic properties in the 90°-layers with bundle structure can be replaced by the transverse stiffness of the homogenised 90°-layer material. © 2014 The Author(s).

Place, publisher, year, edition, pages
SAGE Publications Ltd , 2014. Vol. 33, no 14, 1339-1352 p.
Keyword [en]
Boundary conditions, Classical laminate theory, Effective stiffness, Non-crimp fabric, Waviness
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-13155DOI: 10.1177/0731684414526290OAI: oai:DiVA.org:ri-13155DiVA: diva2:973351
Available from: 2016-09-22 Created: 2016-09-22Bibliographically approved

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Journal of reinforced plastics and composites (Print)
Materials Engineering

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Citation style
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  • en-US
  • fi-FI
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