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  • 2005-2009  (2)
  • 1
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 508 (Mar. 2006), p. 523-530 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Although the use of the Finite Elements Method (FEM) has more and more become a natural course of action for the creation of component parts, not yet the whole potential of numerical simulation is used. The absences of interfaces between the different calculations, missing or inaccurate physical data as well as the lack of theoretical background in certain areas prevent a complete virtual product development. Design, solidification simulation, calculation of mechanical properties, stress calculations, and the prediction of the operating life of a component are at present almost exclusively regarded as separate solutions. Necessary however is a meshed computation loop, where the solutions of previous steps are moved on to the following ones. Due to improvements in the area of solidification simulation and with the help of new theoretical concepts for the prediction of mechanical properties of casted aluminum parts, it is now possible to do all the technical analysis with just one software package. This solves the interface problem and especially the error-prone change between different numerical calculation processes
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 508 (Mar. 2006), p. 509-514 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Meanwhile the calculation of cooling and solidification is a well introduced tool into thefoundry industry for calculating gating and riser systems. However, knowing the areas of last solidification is often no answer to the question if there are any defects in the casting or not. Of course one requirement is an exact description of the heat flow and the heat transfer between melt and mould. But furthermore the liquid/liquid and liquid/solid shrinkage influence the temperature fields due to a convective heat flux. Also auxiliary material influence the liquid/solid behaviour. Auxiliary materials can be on one hand the inoculation material and on the other chills with and without coating. This is the reason, why defects near the gating often can not be detected by a conventional solidification calculation, which doesn’t take into account the impact of the auxiliary material on the convective flow. With new algorithms within the FEM program SIMTEC/WinCast it is possible to respect this behaviour during the simulation of solidification. Special attention was turned to the expansion of graphite in ductile irons. The graphite first nucleates in the liquid, and then continues to grow in the solid phase depending on the alloy compositions and the solidification parameters. With the knowledge about the physical properties of the alloy the location and the size of defects can be predicted precisely
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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