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Träfflista för sökning "hsv:(TEKNIK OCH TEKNOLOGIER) hsv:(Materialteknik) srt2:(1990-1999)"

Sökning: hsv:(TEKNIK OCH TEKNOLOGIER) hsv:(Materialteknik) > (1990-1999)

  • Resultat 1-10 av 1795
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1.
  • Edberg, Jonas, et al. (författare)
  • Efficient three-dimensional model of rolling using an explicit finite-element formulation
  • 1993
  • Ingår i: Communications in Numerical Methods in Engineering. - : Wiley. - 1069-8299 .- 1099-0887. ; 9:7, s. 613-627
  • Tidskriftsartikel (refereegranskat)abstract
    • Rolling is simulated by a three-dimensional finite-element model with elastoplastic constitutive equations. The use of an explicit finite-element formulation, instead of the more commonly used implicit formulation, has reduced the required computing time. The larger of the models used in one step towards a general and complete computational model of rolling. Results from experiments and from two and three-dimensional calculations are compared.
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2.
  • Edberg, Jonas, et al. (författare)
  • The wedge rolling test
  • 1994
  • Ingår i: Journal of Materials Processing Technology. - : Elsevier BV. - 0924-0136 .- 1873-4774. ; 42:2, s. 227-238
  • Tidskriftsartikel (refereegranskat)abstract
    • A method for the evaluation of friction models is described. A wedge is rolled to uniform thickness, a range of reductions being investigated thereby in one experiment. Finite-element simulations are performed in order to estimate the friction parameters that can be used in the simulation of hot rolling. The influence of the material parameters and the friction parameters on the calculated results are investigated and the latter are compared with experimental results. It is shown that it is possible to separate the influence of the material parameters and the friction parameters, thus enabling the friction parameters to be evaluated from a minimum number of experiments.
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3.
  • Lindgren, Lars-Erik, et al. (författare)
  • Explicit versus implicit finite element formulation in simulation of rolling
  • 1990
  • Ingår i: Journal of Materials Processing Technology. - 0924-0136 .- 1873-4774. ; 24, s. 85-94
  • Tidskriftsartikel (refereegranskat)abstract
    • The computational efficiency of the explicity finite element code DYNA2D and the implicit code NIKE2D are compared in the case of simulation of rolling. It is found that the explicit code is preferable. The advantages of the explicit formulation will be even more pronounced in three-dimensional simulations
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4.
  • Niska, John, et al. (författare)
  • Formation of the 124 phase superconductor (YBa2Cu4O8) by retaining oxygen in a reaction HIP sintering process
  • 1990
  • Ingår i: Journal of materials science letters. - 0261-8028 .- 1573-4811. ; 9:7, s. 770-771
  • Tidskriftsartikel (refereegranskat)abstract
    • The ceramic superconductor YBa2Cu4O8 has been produced by high temperature sintering of a mixture of CuO and YBa2Cu3O7 in a glass capsule under high hydrostatic argon pressure. The resulting highly dense material is investigated by X-ray diffraction, optical and electron microscopy, resistance measurements and hardness measurements, and shown to be a homogeneous High transition temperature superconductor.
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7.
  • Ye, Guozhu, et al. (författare)
  • Association of halogens in electric arc furnace dust and zinc oxide fume before and after leaching
  • 1999
  • Ingår i: REWAS '99. ; , s. 1503-1510, s. 1503-1510
  • Konferensbidrag (refereegranskat)abstract
    • Pilot-scale tests were conducted at MEFOS for the production of zinc oxide from Electric Arc Furnace (EAF) dust using a DC arc furnace with a hollow electrode suitable for the processing of fine-grained materials. The association of halides in Electric Arc Furnace (EAF) dust and zinc oxide fume before and after water leaching was investigated by XRD, SEM, and TEM analysis. In EAF dust, chlorine and fluorine were found to exist primarily as NaCl, KCl, and CaF2. After water leaching of the zinc oxide fume the halide concentrations were reduced to about 200 ppm Cl and 200 ppm F, mostly in the form of CaF2 and chlorine-containing silicate phases.
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8.
  • Cho, Choong-Rae, et al. (författare)
  • Preparation of Na0.5K0.5NbO3/La0.6Sr0.2Mn1.2O3/LaAlO3 Thin Film Structures by Pulsed Laser Deposition
  • 1999
  • Ingår i: Multicomponent oxide films for electronics. - Warrendale, Pa : Materials Research Society. - 1558994815 - 9781558994812 ; , s. 249-254
  • Konferensbidrag (refereegranskat)abstract
    • We report on ferroelectric/giant magnetoresistive Nao.sKo.sNbCVLao.oSrojMniO} (NKN/LSMO) heterostructures gro\vn onto LaAlOj (001) single crystal using KrF pulsed laser ablation of stoichiometric ceramic target. Main processing parameters have been optimized to obtain smooth LSMO template layer, avoid NKN-LSMO interdiffusion, preserve NKN stoichiometry against the lost of volatile potassium and sodium and achieve reasonable reliability of NKN film performance. X-ray diffraction 0- 20 scans and rocking curves evidence for single-phase content and high c-axis orientation both in template LSMO and top NKN layers. Ferroelectric measurements yield remnant polarization P, of 1.5 (.iC/cm2 and spontaneous polarization Ps of 7 jiC/cm2 at electric field strength of 130 kV/cm. At room temperature, dielectric permittivity e' and dissipation factor tancJhave been found to vary from 595 to 555 and 0.046 to 0.029 respectively in the frequency range of 0.4 to 20 kHz. At 10 kHz dielectric permittivity linearly increases from 410 to 650 in the temperature range 77 K to 415 K while the dissipation factor below 320 K does not exceed 3%.
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