About Loading Displacement Restrictions

When the model is loaded with the FEM_INPUT command all existing nodes, elements, material properties, coordinate systems and essential element properties are read from the FE input file.

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OPTIONS

Forces, pressures and other loads are not required by the optimization model and therefore not loaded. By default fixed nodes are not loaded. Using the READ_BC = ALL option in the command OPTIONS, all fixed nodes are loaded directly as node displacement restrictions for the optimization model. This option is activated with the command:

OPTIONS
 READ_BC = ALL
END_

Remarks

  1. For some solver interfaces it is also possible to directly enter a number to specify which fixed nodes are loaded as optimization boundary conditions. This proves especially useful when the optimization boundary conditions are defined as an additional load case in the FE model. The exact function of this load option depends on the different interfaces (see Solver Specific Features).
  2. Fixed nodes can also be defined in the parameter file with the command DVCON_SHAPE. However, defining fixed nodes in the FE model is more efficient.
  3. Only fixed nodes with a translation equal to zero in the one, two or three direction according to the coordinate systems of the nodes can be loaded from the FE input in the optimization model. Constraint displacements not equal to zero are not loaded.