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Träfflista för sökning "WFRF:(Persson Kent) srt2:(1995-1999)"

Sökning: WFRF:(Persson Kent) > (1995-1999)

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  • Holmberg, Stefan, et al. (författare)
  • Nonlinear mechanical behaviour and analysis of wood and fibre materials
  • 1999
  • Ingår i: Computers & Structures. - 0045-7949. ; 72:4-5, s. 459-459
  • Tidskriftsartikel (refereegranskat)abstract
    • The mechanical behaviour of wood was studied from a micro up to a macro level. Wood is a cellular material possessing a high degree of anisotropy. Like other cellular solids, it often exhibits a highly nonlinear stress–strain behaviour. In the present study the mechanical properties of the cellular structure of wood are characterized and modelled, the irregular cell shape, the anisotropic layered structure of the cell walls and the periodic variations in density being taken into account. The continuum properties were derived by use of a homogenization procedure and the finite element method. Stiffness and shrinkage properties determined by this procedure are presented and are compared with measured data. The constitutive properties thus determined at various structural levels can be used in numerical simulations of the behaviour of wood in different industrially related areas. One such area is that of the refining process in mechanical pulp manufacture. Simulations of the deformation and fracturing of wood specimens loaded under conditions similar to those found in the refining process are presented. The numerical and experimental results obtained are compared.
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  • Jansson, Tomas, et al. (författare)
  • Ultrasound Doppler Vector Tomography - Measurements of Directional Blood Flow
  • 1997
  • Ingår i: Ultrasound in Medicine and Biology. - 0301-5629. ; 23:1, s. 47-57
  • Tidskriftsartikel (refereegranskat)abstract
    • An experimental system has been developed to verify the possibility of detecting flow activity using a technique called ultrasound Doppler vector tomography. A tomography algorithm is used to reconstruct blood flow vector fields using data from computer-controlled ultrasound continuous-wave Doppler scanning equipment. The result is a picture in which the brightness variations represent the reconstructed values of the curl of the velocity field (del x v). Continuous ultrasound is transmitted into a region with flow activity and the Doppler-shifted signals are received. To obtain measurement data suited for fan beam tomography, the scanning is performed in a plane from points encircling the region. Reconstructions have been achieved using measurement data from two different flow phantoms. A comparison between the experimental results and simulations shows good conformity. Copyright (C) 1997 World Federation for Ultrasound in Medicine & Biology.
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