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Effects of crimp and textile architecture on the stiffness and strength of composites with 3D reinforcement
RISE - Research Institutes of Sweden, Materials and Production, SICOMP. KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
2019 (English)In: Advances in Materials Science and Engineering, ISSN 1687-8434, E-ISSN 1687-8442, Vol. 2019, article id 8439530Article in journal (Refereed) Published
Abstract [en]

The aim of this study is to experimentally determine how the weave architecture and yarn crimp affect the measured tensile stiffness and strength of composites containing 3D textile reinforcement. It is shown that both the stiffness and strength decrease nonlinearly with increasing 3D crimp. The ultimate strength of specimens containing nominally straight yarns and specimens containing crimped yarns can differ more than a factor of 3, and the stress causing onset of damage can be affected even more. Adding nominally straight stuffer yarns into a 3D-woven reinforcement significantly increases the fibre volume fraction, the stiffness, and the strength of the composite. However, since the stuffer yarns are virtually straight and thus stiffer than the warp yarns, they attract the load and reach their strength at relatively lower strain than the warp yarns. The reinforcement architecture varies between the surfaces and the interior of the studied textiles, which has corresponding influence on the local stiffness. The onset of failure is predicted satisfactorily accurate with relatively simple estimations. The ultimate strength is a result of extensive damage progression and thus more dubious to predict. © 2019 Fredrik Stig and Stefan Hallström.

Place, publisher, year, edition, pages
2019. Vol. 2019, article id 8439530
Keywords [en]
Architecture, Reinforcement, Stiffness, Tensile strength, Textiles, Yarn, 3D reinforcements, 3D textiles, Damage progression, Fibre volume fraction, Tensile stiffness, Ultimate strength, Warp yarns, Weave architecture, Weaving
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Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-38226DOI: 10.1155/2019/8439530Scopus ID: 2-s2.0-85062791938OAI: oai:DiVA.org:ri-38226DiVA, id: diva2:1299513
Note

 Funding details: FP7 Ideas: European Research Council; Funding details: European Commission; Funding text 1: /is work was financially supported by the European Commission through the EU FP7 contract no. ACPO-GA-2010-266026, Cost Effective Reinforcement of Fastener Areas in Composites (CERFAC). Biteam AB is acknowledged for supplying the 3D-woven preforms.

Available from: 2019-03-27 Created: 2019-03-27 Last updated: 2019-03-27Bibliographically approved

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