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Sökning: WFRF:(Johansson Kenneth) > Chalmers tekniska högskola

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  • Ebenhag, Sven-Christian, 1976-, et al. (författare)
  • Time transfer using an asynchronous computer network: Results from three weeks of measurements
  • 2007
  • Ingår i: European Frequency and Time Forum, 29/5 - 1/6, Geneva, CH.
  • Konferensbidrag (refereegranskat)abstract
    • We have performed a time transfer experiment between two atomic clocks, over a distance of approximately 75 km using an 10 Gbit/s asynchronous fiber-optic computer network. The time transfer was accomplished through passive listening on existing data traffic and a pilot sequence in the SDH bit stream. In order to assess the fiber-link clock comparison, we simultaneously compared the clocks using a GPS carrier phase link. The standard deviation of the difference between the two time transfer links over the three-week time period was 243 ps.
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  • Johansson, Göran, 1975-, et al. (författare)
  • Computational modeling of inelastic large ratcheting strains
  • 2005
  • Ingår i: International Journal of Plasticity. ; 21:5, s. 955-980
  • Tidskriftsartikel (refereegranskat)abstract
    • A framework for phenomenological hyperelasto-plasticity with initial anisotropy, kinematic hardening as well as anisotropic damage is presented in Menzel et al. (2003a). In this contribution we exploit and extend this framework to include several back-stresses in order to capture the ratchetting response of polycrystalline metals subjected to cyclic stress with non-zero mid-value. The evolution equations for kinematic hardening resemble a linear combination of the multiple-Armstrong-Frederic and the Burlet-Cailletaud models, which are extended to the large strain setting. The capability of the model to capture various phenomenological characteristics, in particular multi-axial ratchetting, is illustrated by numerical examples. Comparisons with uni-axial and bi-axial experimental ratchetting results for carbon steel are given. Finally, the finite element analysis of a simplified railway turnout component subjected to cyclic loading is presented.
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  • Johansson, Göran, 1975-, et al. (författare)
  • Modeling of anisotropic inelasticity in pearlitic steel at large strains due to deformation induced substructure evolution
  • 2005
  • Ingår i: European Journal of Mechanics - A/Solids. ; 24:6, s. 899
  • Tidskriftsartikel (refereegranskat)abstract
    • A macroscopic model for deformation induced anisotropy due to substructure evolution at large strains in pearlitic steel is proposed within a thermodynamically consistent framework. The model is motivated via experimental observations, e.g., [Ivanisenko, Y., Lojkowski, W., Valiev, R.Z., Fecht, H.-J., 2003. The mechanism of formation of nanostructure and dissolution of cementite in a pearlitic steel during high pressure. Acta Mater. 51, 5555–5570]. Although each pearlitic grain has a preferred direction determined by cementite lamellas, initial random orientation of the grains is interpreted as initial macroscopic isotropy. However, the oriented grains tend to align after large shear deformation. The proposed model for evolution of orientation and stiffness is inspired by recent developments in bio-mechanics, e.g., [Imatani, S., Maugin, G.A., 2002. A constitutive model for material growth and its application to three-dimensional finite element analysis. Mech. Res. Commun. 29, 477–483; Menzel, A., 2004. Modelling of anisotropic growth in biological tissues. Biomech. Model. Mechanobiol. 3, 147–171]. One important application is large irreversible shear deformations in the surface layer of railway track components.
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  • Resultat 1-10 av 51
  • [1]23456Nästa
 
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