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ans2sdt

Purpose

Interface between ANSYS and SDT (part of FEMLink)

Syntax

 ans2sdt('read FileName')       % .rst, .cdb, .matrix, .mode  files
 ans2sdt('write FileName')      % .cdb file
 ans2sdt('BuildUp FileName')    % .rst and .emat files
 def=ans2sdt('def FileName.rst')% .rst or .mode files 

Description

BuildUp

ans2sdt('BuildUp FileName') reads the binary files FileName.rst for model definition and FileName.emat for element matrices. The result is stored in Up (a type 3 superelement handled by upcom). FileName.mat is used to store the superelement. Valid calls are

Up=ans2sdt('buildup file');  
[m,k]=upcom(Up,'assemble not');            

% or 

clear all
mo1=ans2sdt('buildup file');  
global('Up'); Up=mo1;  % set global variable
[m,k]=upcom('assemble not');            

For recent versions of ANSYS, you may have to manually add the ematwrite,yes command to the input file to make sure that all element matrices are written. This command is not accessible from the ANSYS menu.

There is a partial attempt to fill in element properties in Up.il. You can also use data=stack_get(model,'info','RealConstants','getdata') to obtain the cell array containing the ANSYS real constants for various elements. The index in this cell array corresponds to element ProId values.

conv

This command lists conversion tables for elements, topologies, face topologies. You can redefine (enhance) these tables by setting preferences of the form setpref('FEMLink', 'ansys.elist',value), but please also request enhancements so that the quality of our translators is improved.

read

This command reads files based on their standard ANSYS extension.

.matrix files are read assuming ASCII Harwell Boeing format obtained with HBMAT, Fname,Ext,--,ASCII,STIFF. RHS vectors or binary matrices are not read yet.

.mode files contain deformations which are read into the usual SDT format. .rst files contains model information and the function attempts to run the BuildUp command.

.cdb input files also written by ANSYS using the CDWRITE ALL,FileName,cdb command. Please also request enhancements on the support of this format so that the quality of our translators is improved.

ANSYS does not store boundary conditions in the .rst files so that these can only be imported from .cdb file. If you only have fixed boundary conditions, you can easily generate those with

 model=ans2sdt('buildup test');         % read model
 def=ans2sdt('def test.rst');           % read deformations
 model = fe_case(model,'fixdof','Fixed_Dofs', ...
   fe_c(model.DOF,def.DOF,'dof',2));
 cf=feplot; cf.model=model; cf.def=def; % display

Def

def=ans2sdt('def FileName.rst') or def=ans2sdt('def FileName.mode') reads deformations in .rst or .mode files

Write

ans2sdt('write FileName.cdb',model) is the current prototype for the ANSYS writing capability. In ANSYS .cdb files are written with the CDWRITE ALL, FileName, cdb command. This does not currently write a complete .CDB file so that some manual editing is needed for an ANSYS run after the write.

See also

FEMLink


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