About the ModelThis is the same model as the previous example and the objective function and constraints are the same. In this case, the finite element model is built using a tetrahedral mesh. Further, a constraint which enforces manufacturability by means of stamping (symmetry is also possible but not shown here) is required. The standard coupling conditions may not be used, as the surface nodes of the mesh are not lying exactly in the direction of stamping. The following figure illustrates the mesh, boundary conditions and the stress distribution of the initial model.
For arbitrary meshes, the surface nodes may not be grouped using the standard link conditions. In this case, a geometric and mesh independent approach has to be used. The user has to specify a surface node group which describes the stamping surface. In addition, the stamping direction has to be defined using a coordinate system. The stamping surface is described by the stamping direction and the nodes on this surface produce a manufacturing curve. When the manufacturing curve is moved along the stamping direction, the stamping surface is described. SIMULIA Tosca Structure automatically determines the producing curve for a given link domain. The definition of the following groups is required for the optimization task: Procedure Summary
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