Users:Structural Optimization/Design Variables/Nodal Thickness

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(General Description)
(Example of a Complete Input Block)
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=== Example of a Complete Input Block ===
 
=== 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.
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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.
  
 
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Revision as of 12:34, 20 October 2010


Contents

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


Input File

bla


Documented Results

bla


Theory and Details

bla


References





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