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Predicting damage initiation in 3D fibre-reinforced composites – The case for strain-based criteria
Chalmers University of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
Chalmers University of Technology, Sweden.
Chalmers University of Technology, Sweden.
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2019 (English)In: Composite structures, ISSN 0263-8223, E-ISSN 1879-1085, Vol. 230, article id 111336Article in journal (Refereed) Published
Abstract [en]

Three dimensional (3D) fibre-reinforced composites have shown weight efficient strength and stiffness characteristics as well as promising energy absorption capabilities. In the considered class of 3D-reinforcement, vertical and horizontal weft yarns interlace warp yarns. The through-thickness reinforcements suppress delamination and allow for stable and progressive damage growth in a quasi-ductile manner. With the ultimate goal of developing a homogenised computational model to predict how the material will deform and eventually fail under loading, this work proposes candidates for failure initiation criteria. It is shown that the extension of the LaRC05 stress-based failure criteria for unidirectional laminated composites, to this class of 3D-reinforced composite presents a number of challenges and leads to erroneous predictions. Analysing a mesoscale representative volume element does however indicate, that loading the 3D fibre-reinforced composite produces relatively uniform strain fields. The average strain fields of each material constituent are well predicted by an equivalent homogeneous material response. Strain based criteria inspired by LaRC05 are therefore proposed. The criteria are evaluated numerically for tensile, compressive and shear tests. Results show that their predictions for the simulated load cases are qualitatively more reasonable. 

Place, publisher, year, edition, pages
Elsevier Ltd , 2019. Vol. 230, article id 111336
Keywords [en]
3D-fibre reinforcement, Damage initiation, Finite element modelling, Fiber reinforced plastics, Fibers, Forecasting, Laminated composites, Yarn, D-fibre, Energy absorption capability, Representative volume element (RVE), Strength and stiffness characteristics, Stress-based failure criterion, Through-thickness reinforcements, Reinforcement
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Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-40538DOI: 10.1016/j.compstruct.2019.111336Scopus ID: 2-s2.0-85072912566OAI: oai:DiVA.org:ri-40538DiVA, id: diva2:1361909
Note

Funding details: Energimyndigheten, 2016-008713; Funding text 1: The project is financially supported by the Swedish Energy Agency under contract 2016-008713 . The simulations were performed on resources at Chalmers Centre for Computational Science and Engineering (C3SE) provided by the Swedish National Infrastructure for Computing (SNIC). Appendix A

Available from: 2019-10-17 Created: 2019-10-17 Last updated: 2019-10-17Bibliographically approved

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