Journal: IUTAM Bookseries

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Publisher

Springer

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ISSN

1875-3507

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2007 - 201011
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Publications 1 - 10 of 11
  • Some new results on fibre models
    Item type: Conference Paper
    Herrmann, Hans Jürgen; Kun, Ferenc; Raischel, Frank (2009)
    IUTAM Bookseries ~ IUTAM Symposium on Scaling in Solid Mechanics
    Fibre models are used as simple models to describe failure. They are based on the probability distribution of broken fibres. The load redistribution after a fibre yields can be global or local and the first case can often be solved analytically. We will present an interpolation between these the local and the global case and apply it to experimental situations like the compression of granular packings. Introducing viscoelastic fibres allows to describe the creep of wood. It is even possible to deal analytically with a gradual degradation of fibres and consider damage as well as healing. In this way Basquin’s law of fatigue can be reproduced giving good agreement with measurements of asphalt samples in Brazil tests. The histograms of bursts and waiting times reveal universal laws that are independent on the material.
  • Fracture of Foamed Cementitious Materials: A Combined Experimental and Numerical Study
    Item type: Conference Paper
    Meyer, D.; Man, Hau-Kit; van Mier, Jan G.M. (2009)
    IUTAM Bookseries ~ IUTAM Symposium on Mechanical Properties of Cellular Materials
    Foamed cements have the advantage of low density and good thermal isolation properties. In an effort to improve their low mechanical properties, a detailed study of the failure mechanism of foamed cement is undertaken. By means of in-situ micro compression tests inside an X-ray scanner, deformation and fracture of small specimen can be observed in detail. Using a simple beam lattice model, the material is modelled and fracture is simulated, taking into account as much as possible detail of the material structure. Direct 3D comparison with the outcome of the experiments is possible which is further assisted by using directly the material structures measured on the small samples that are subsequently tested in the X-ray scanner. Some preliminary test results and simulations are presented in this paper.
  • Relaxed Potentials and Evolution Equations for Inelastic Microstructures
    Item type: Conference Paper
    Hackl, Klaus; Kochmann, Dennis M. (2008)
    IUTAM Bookseries ~ IUTAM Symposium on Theoretical, Computational and Modelling Aspects of Inelastic Media
  • Compressibility Effects on Turbulent Separated Flow in a Streamwise-Periodic Hill Channel - Part 1
    Item type: Conference Paper
    Ziefle, Jörg; Kleiser, Leonhard (2009)
    IUTAM Bookseries ~ IUTAM Symposium on Unsteady Separated Flows and their Control
    We present large-eddy simulation (LES) results of the streamwise-periodic hill channel configuration, which is a standard test case for massively separated flows. The Reynolds number (computed with the hill height, the bulk mass flux through the cross-section above the hill crest and the dynamic viscosity at the wall) is chosen as 2,800, in accordance with recent DNS data from Peller & Manhart [4] for incompressible flow. The Mach number was varied between Ma= 0.2 and Ma = 2.5. The numerical simulation code NSMB discretises the compressible Navier-Stokes equations with the finite-volume method on a deliberately-chosen coarse structured mesh. The subgrid-scales are accounted for by the well-proven approximate deconvolution model (ADM). This investigation is an extension of our previous work on this configuration, which focused on the validation of our simulation approach at nearly incompressible flow conditions. In this first part of a two-part contribution [8], the scope lies primarily on the effect of compressibility, especially on the separation characteristics and the flow conditions at the walls. To this end, we introduce a new measure that quantifies reverse flow at the walls and study the distributions of the friction and pressure coefficients. Unlike other investigations of this flow case, we also include the upper wall in this study. Furthermore, we describe the dependence of the turbulence and separation characteristics on the Mach number.
  • Time-continuous evolution of microstructures in finite plasticity
    Item type: Conference Paper
    Kochmann, Dennis M.; Hackl, Klaus (2010)
    IUTAM Bookseries ~ IUTAM Symposium on Variational Concepts with Applications to the Mechanics of Materials
  • Wave packet pseudomodes upstream of a swept cylinder
    Item type: Conference Paper
    Obrist, Dominik; Schmid, Peter J. (2010)
    IUTAM Bookseries ~ Seventh IUTAM Symposium on Laminar-Turbulent Transition
  • An Energetic Approach to Deformation Twinning
    Item type: Conference Paper
    Le, Khanh C.; Kochmann, Dennis M. (2010)
    IUTAM Bookseries ~ IUTAM Symposium on Variational Concepts with Applications to the Mechanics of Materials
  • Coupling Atomistic and Continuum Descriptions Using Dynamic Control
    Item type: Conference Paper
    Kotsalis, E.M.; Walther, Jens Honoré; Koumoutsakos, P. (2009)
    IUTAM Bookseries ~ IUTAM Symposium on Advances in Micro- and Nanofluidics
  • Analogous non-smooth models of mechanical and electrical systems
    Item type: Conference Paper
    Möller, Michael; Glocker, Christoph (2007)
    IUTAM Bookseries ~ IUTAM Symposium on Multiscale Problems in Multibody System Contacts
  • A combined continuation and penalty method for the determination of optimal hybrid mechanical trajectories
    Item type: Conference Paper
    Yunt, Kerim; Glocker, Christoph (2007)
    IUTAM Bookseries ~ Iutam Symposium on Dynamics and Control of Nonlinear Systems with Uncertainty
Publications 1 - 10 of 11