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A micromechanically based model for strain rate effects in unidirectional composites
Chalmers University of Technology, Sweden.
RISE Research Institutes of Sweden, Materials and Production, Polymeric Materials and Composites. Chalmers University of Technology, Sweden.ORCID iD: 0000-0003-3656-4900
RISE Research Institutes of Sweden, Materials and Production, Polymeric Materials and Composites. Chalmers University of Technology, Sweden.ORCID iD: 0000-0002-2627-3280
RISE Research Institutes of Sweden, Materials and Production, Polymeric Materials and Composites.ORCID iD: 0000-0003-3755-6419
2020 (English)In: Mechanics of materials, ISSN 0167-6636, E-ISSN 1872-7743, Vol. 148, article id 103491Article in journal (Refereed) Published
Abstract [en]

This article addresses dynamic behaviour of fibre reinforced polymer composites in terms of a transversely isotropic viscoelastic-viscoplastic constitutive model established at the unidirectional ply level. The model captures the prelocalized response of the ply in terms of rate dependent elasticity and strength without damage. A major novelty is that the model draws from computational homogenization, with matrix and fibre materials as subscale constituents for a representative volume element of the ply. The micromechanics of the strain rate dependent polymer matrix is represented by an isotropic pressure sensitive viscoelastic-viscoplastic prototype model. For the fibre material, transverse elasticity is assumed. The constituents are homogenized via the fluctuating strain of the subscale, where a simple ansatz is applied to allow for constant stress in the plane transverse to the fibre orientation. Despite the relatively simple modelling assumptions for the constituents, the homogenized model compares favourably to experimental data for an epoxy/carbon fibre based composite, subjected to a variety of challenging uniaxial off-axis tests. The model response clearly reflects observed strain rate dependencies under both tensile and compressive loadings. 

Place, publisher, year, edition, pages
Elsevier B.V. , 2020. Vol. 148, article id 103491
Keywords [en]
Micromechanics, Off-axis loading, Strain rate dependence, Unidirectional (UD) ply, Elasticity, Fiber reinforced plastics, Fibers, Viscoelasticity, Computational homogenization, Fibre-reinforced polymer composites, Representative volume element (RVE), Strain rate dependency, Tensile and compressive loading, Transversely isotropic, Unidirectional composites, Viscoplastic constitutive modeling, Strain rate
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-45150DOI: 10.1016/j.mechmat.2020.103491Scopus ID: 2-s2.0-85086576741OAI: oai:DiVA.org:ri-45150DiVA, id: diva2:1453869
Note

Funding details: Horizon 2020 Framework Programme, H2020; Funding details: H2020 Marie Skłodowska-Curie Actions, MSCA, 721256; Funding details: VINNOVA, 25173-1, 2016-04239; Funding text 1: The authors gratefully acknowledge the support of the ICONIC project under the Marie Skłodowska-Curie grant agreement No 721256 of the European Union Horizon 2020 research and innovation programme. Co-funding has also been provided from the Swedish FFI programme via VINNOVA (dnr 2016-04239) and from the development funds of RISE ( RISE SICOMP SK-project 25173-1).

Available from: 2020-07-13 Created: 2020-07-13 Last updated: 2024-01-17Bibliographically approved

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Singh, VivekendraOlsson, RobinMarklund, Erik

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