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<a name = "hj-top"> </a><table class = "table1" id = "table11"><tr><td><table class = "DocHeader"><tr><td class = "DocHeader1" colspan = "2"><h1>Models for Optimization</h1></td></tr><tr><td class = "DocHeader4" colspan = "2"/></tr><tr><td class = "DocHeader3" colspan = "2"><table class = "DocThemeIntro" id = "table12"><tr><td class = "Intro1"><p class = "header"><p class = "abstract">
    <span class = "shortdesc">
      When defining a model for analyzing, the selection and definition
      of the loads and boundary conditions should be constructed with special
      consideration because an incorrectly defined or forgotten load or support
      might have a very pronounced effect on the result of the optimized structure.
    </span>

    <p>The basic characteristics of the analysis model that can be optimized
are described in detail in  <a class = "xref" href = "tso-m-usr-solver-sb.htm#tso-m-usr-solver-sb" title = "This chapter describes the formats and functionalities of the different solvers supported by SIMULIA Tosca Structure. The topological and physical properties of the analysis model (finite element input file) are required for the optimization of an FE model. Normally, not all information contained in the analysis model is necessary for an optimization. The optimization module returns the modified model data to the FE solver. The node coordinates are changed during shape and bead optimization. New materials and element properties are generated during topology optimization and the assignments of the elements to the material definitions and material properties are changed. Therefore, there are very few restrictions to the FE modeling (finite element input file).">Solver Specific Features</a>  (optimizable element
types, number of <span class = "ph">load cases</span>
and permitted boundary conditions, types of analysis, nonlinearities). Keep in
mind, that one single finite element can consist of several laminates
which is especially common for shell elements to specify, for example, several
cross sections or materials. In <span class = "ph">SIMULIA Tosca Structure</span>,
this is called a "ply". Currently <span class = "ph">SIMULIA Tosca Structure</span>
supports only one single ply for each element and stops with an error
message if elements with multiple plies are found.</p>
  </p>

</p><hr class = "header"/></td></tr><tr><td class = "Intro2"><span class = "run-in">In this section:</span><br/><ul class = "ulthemes"><li><a title = "The basic idea of topology optimization with respect to model requirements is described." href = "tso-c-usr-model-topoOptModel.htm">Models for Topology Optimization</a></li><li><a title = "The basic idea of shape optimization with respect to model requirements is described." href = "tso-c-usr-model-shapeOptModel.htm">Models for Shape Optimization</a></li><li><a title = "The basic idea of bead optimization with respect to model requirements is described." href = "tso-c-usr-model-beadOptModel.htm">Models for Bead Optimization</a></li><li><a title = "The basic idea of sizing optimization with respect to model requirements is described." href = "tso-c-usr-model-sizingOptModel.htm">Models for Sizing</a></li><li><a title = "This guide is meant to help Abaqus users who want to use Tosca Structure for optimization with nonlinear behavior." href = "tso-c-usr-model-modelguide.htm">Modeling Guide for Nonlinear Models</a></li></ul></td></tr></table></td></tr></table>
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