Users:Structural Optimization/Design Variables/Nodal Thickness

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General Description

Short Info

With this design variable, the nodal thickness can be optimized. This is especially usefull in combination with SHELL elements, which are able to take variable thicknesses into account.

The thickness at each node can be initialized by . Alternatively, the initial thickness is computed as the mean thickness of the surrounding elements.

Parameters in the Input File

Compulsory Parameters
Parameter Values, Default(*) Description
TYPE NODE ID, ND-SET ID Linking to previously defined nodes or node sets
SUBTYPE THICKNESS To obtain the desired design variable
Optional Parameters
Parameter Values, Default(*) Description
BOUND OPT-BOUND ID Linking to a bound defined in BOUND block.

Remark: only SCALAR_BOUND is valid.

Example of a Complete Input Block

This design variable can be defined for one node of for a nodal set. Since the thickness has generally an obvious limit, it is good practice to add a bound. Since this is a scalar design variable, only SCALAR_BOUND is appropriate.

OPT-VAR 1
 TYPE=NODE 100 SUBTYPE=THICKNESS BOUND=OPT-BOUND 1
 TYPE=ND-SET 2 SUBTYPE=THICKNESS BOUND=OPT-BOUND 1

A complete test example

Model description

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Input File

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Documented Results

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Theory and Details

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References





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