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  • 1.
    Alimadadi, Majid
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Lindström, Stefan B.
    Division of Solid Mechanics, Department of Management and Engineering, Linköping University, Linköping, Sweden.
    Kulachenko, Artem
    Department of Solid Mechanics, Royal Institute of Technology (KTH), Stockholm, Sweden.
    Role of microstructures in the compression response of three-dimensional foam-formed wood fiber networks2018In: Soft Matter, ISSN 1744-683X, E-ISSN 1744-6848, Vol. 14, no 44, p. 8945-8955, article id C7SM02561KArticle in journal (Refereed)
    Abstract [en]

    High-porosity, three-dimensional wood fiber networks made by foam forming present experimentally accessible instances of hierarchically structured, athermal fiber networks. We investigate the large deformation compression behavior of these networks using fiber-resolved finite element analyses to elucidate the role of microstructures in the mechanical response to compression. Three-dimensional network structures are acquired using micro-computed tomography and subsequent skeletonization into a Euclidean graph representation. By using a fitting procedure to the geometrical graph data, we are able to identify nine independent statistical parameters needed for the regeneration of artificial networks with the observed statistics. The compression response of these artificially generated networks and the physical network is then investigated using implicit finite element analysis. A direct comparison of the simulation results from the reconstructed and artificial network reveals remarkable differences already in the elastic region. These can neither be fully explained by density scaling, the size effect nor the boundary conditions. The only factor which provides the consistent explanation of the observed difference is the density and fiber orientation nonuniformities; these contribute to strain-localization so that the network becomes more compliant than expected for statistically uniform microstructures. We also demonstrate that the experimentally manifested strain-stiffening of such networks is due to development of new inter-fiber contacts during compression.

  • 2.
    Westermeier, F.
    et al.
    Max Planck Institute for the Structure and Dynamics of Matter, CFEL, Luruper Chaussee 149, Hamburg, Germany .
    Pennicard, D.
    Center for Free-Electron Laser Science, DESY, Notkestrasse 85, Hamburg, Germany .
    Hirsemann, H.
    Center for Free-Electron Laser Science, DESY, Notkestrasse 85, Hamburg, Germany .
    Wagner, U. H.
    Diamond Light Source Ltd, Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire, United Kingdom .
    Rau, C.
    Diamond Light Source Ltd, Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire, United Kingdom .
    Graafsma, Heinz
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design. Center for Free-Electron Laser Science, DESY, Notkestrasse 85, Hamburg, Germany.
    Schall, P.
    Van der Waals-Zeeman Institute, University of Amsterdam, POSTBUS 94485, Amsterdam, Netherlands .
    Lettinga, M. P.
    Forschungszentrum Jülich, Institute of Complex Systems (ICS-3), Jülich, Germany .
    Struth, B.
    Center for Free-Electron Laser Science, DESY, Notkestrasse 85, Hamburg, Germany .
    Connecting structure, dynamics and viscosity in sheared soft colloidal liquids: A medley of anisotropic fluctuations2015In: Soft Matter, ISSN 1744-683X, E-ISSN 1744-6848, Vol. 12, no 1, p. 171-180Article in journal (Refereed)
    Abstract [en]

    Structural distortion and relaxation are central to any liquid flow. Their full understanding requires simultaneous probing of the mechanical as well as structural and dynamical response. We provide the first full dynamical measurement of the transient structure using combined coherent X-ray scattering and rheology on electrostatically interacting colloidal fluids. We find a stress overshoot during the start-up of shear which is due to the strong anisotropic overstretching and compression of nearest-neighbor distances. The rheological response is reflected in uncorrelated entropy-driven intensity fluctuations. While the structural distortion under steady shear is well described by Smoluchowski theory, we find an increase of the particle dynamics beyond the trivial contribution of flow. After the cessation of shear, the full fluid microstructure and dynamics are restored, both on the structural relaxation timescale. We thus find unique structure-dynamics relations in liquid flow, responsible for the macroscopic rheological behavior of the system. © The Royal Society of Chemistry.

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