Users:Structural Optimization/Design Variables/Nodal Thickness

Contents 1 General Description 1.1 Short Info 1.2 Parameters in the Input File 1.3 Example of a Complete Input Block 2 A complete test example 2.1 Model description 2.2 Input File 2.3 Documented Results 3 Theory and Details 4 References

General Description

Short Info

With this design variable, the nodal thickness can be optimized. This is especially usefull in combination with SHELL8 elements since these elements can have a non-constant thickness based on the nodal thicknesses.

The thickness at each node can be initialized in the input file. 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. It is good practice to add a bound to the thickness design variables to avoid unrealistic values. In general, it is obvious to choose an upper and lower limit. Since the thickness 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

blabla mit bildern

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  HEXA8

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  HEXA8EAS9

Input File

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Documented Results

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Theory and Details

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References

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