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  • 1. Gamstedt, E.K.
    et al.
    Sandell, R.
    Berthold, F.
    RISE, Innventia.
    Pettersson, T.
    RISE, Innventia.
    Nordgren, N.
    Characterization of interfacial stress transfer ability of particulate cellulose composite materials2011In: Mechanics of materials, ISSN 0167-6636, E-ISSN 1872-7743, no 11, p. 693-704Article in journal (Refereed)
  • 2.
    Huang, Hui
    et al.
    KTH Royal Institute of Technology, Sweden.
    Hagman, Anton
    KTH Royal Institute of Technology, Sweden.
    Nygårds, Mikael
    RISE, Innventia. KTH Royal Institute of Technology, Sweden.
    Quasi static analysis of creasing and folding for three paperboards2014In: Mechanics of materials, ISSN 0167-6636, E-ISSN 1872-7743, Vol. 69, no 1, p. 11-34Article in journal (Refereed)
    Abstract [en]

    The creasing and folding behavior of three paperboards have been studied both experimentally and numerically. Creasing and folding studies were performed on strips in both the machine direction and the cross machine direction. A finite element model that mimicked the experimental creasing and folding setup was developed, and the creasing and folding behavior could be well predicted for all three paperboards. An experimental characterization scheme consisting of three experiments was proposed, and was shown to be sufficient to predict the creasing and folding behavior. For the whole paperboard the shear strength profiles in the through thickness direction was determined with the notched shear test. Each ply was laid free by grinding, and density measurements and in-plane tension tests were performed on the bottom, middle and top plies of each paperboard. Instead of assuming uniform properties in each ply, the shear strength profiles were used to map the measured properties in the through thickness direction. Numerical simulations were performed when the ply and interface properties of the paperboards were altered to follow different shear strength profiles. This was done in order to mimic different production strategies. It was shown that the interface strengths mainly influenced the folding behavior. Whereas altered the ply properties affected the creasing force needed.

  • 3.
    Larsson, R.
    et al.
    Chalmers University of Technology, Sweden.
    Singh, Vivekendra
    RISE Research Institutes of Sweden, Materials and Production, Polymeric Materials and Composites. Chalmers University of Technology, Sweden.
    Olsson, Robin
    RISE Research Institutes of Sweden, Materials and Production, Polymeric Materials and Composites. Chalmers University of Technology, Sweden.
    Marklund, Erik
    RISE Research Institutes of Sweden, Materials and Production, Polymeric Materials and Composites.
    A micromechanically based model for strain rate effects in unidirectional composites2020In: Mechanics of materials, ISSN 0167-6636, E-ISSN 1872-7743, Vol. 148, article id 103491Article in journal (Refereed)
    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. 

  • 4.
    Larsson, Ragnar
    et al.
    Chalmers University of Technology, Sweden.
    Gutkin, Renaud
    Volvo Car Corporation, Sweden.
    Rouhi, Mohammad
    RISE - Research Institutes of Sweden, Materials and Production, SICOMP.
    Damage growth and strain localization in compressive loaded fiber reinforced composites2018In: Mechanics of materials, ISSN 0167-6636, E-ISSN 1872-7743, Vol. 127, p. 77-90Article in journal (Refereed)
    Abstract [en]

    To increase the use of polymeric structural composites, a major issue is to properly account for intra-laminar failure mechanisms, such as fiber kinking which is typically induced in compression. We propose a new set of continuum damage models that are able to predict fiber kinking response under compression. A structure tensor based formulation is established at the unidirectional ply level, where the elastic material response is governed by transverse isotropy. To consider geometrical effects in conjunction with fiber kinking instability, a continuum damage formulation at finite strain is developed. The fracture area progression includes a convective and a local damage production involving a finite progression speed. In this framework, two damage evolution models are considered; one non–local model including the gradient damage effect and a local one, without the gradient enhancement. The models are implemented in a FE–code and validated for a compression loaded specimen. The models are computationally robust and can predict the localized nature of fiber kinking. A thorough sensitivity study is presented to show how the different formulations influence the predicted responses.

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