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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 Sizing</h1></td></tr><tr><td class = "DocHeader4" colspan = "2"/></tr><tr><td class = "DocHeader3" colspan = "2"><table class = "DocThemeIntro" id = "table12"><tr><td class = "Intro1Only"><p class = "header"><p class = "abstract">
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  The basic idea of sizing optimization with respect to model requirements is described.
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<p>The design area for a sizing optimization must be a shell type of
structure, that is, shell or plate elements.
The shell thicknesses of the most typical modeling shell elements are
supported as design variables. The mesh should be uniform in element
size. Only single layered shells are supported. Contact in the design
area is also allowed. Geometrical nonlinearities are not supported. Constitutive
nonlinear modeling is only allowed outside the design area (for example, a nonlinear
spring).</p>
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