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SOL 106 - Export Stiffness Matrix in nonlinear case

JohLut
Hi,
 
to export the stiffness matrix of a purely linear FE model I've successfully referred to the MALTER command explained in simcompanion.hexagon.com/.../how-to-export-mass-and-stiffness-matrices-of-a-large-model so far.
 
But in addition to that now I'd like to compute a nonlinear static load case and export the linearized stiffness matrix around the static equilibrium point.
How can I do this in an elegant way?
 
Best regards,
Johannes
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  • 0
    If you do not want the GSET info at all, just put it after this:
     
    compile nlstatic list noref $
    $
    ALTER 'END $ NLSTATIC'(1,-3) $
     
    And then edit the remaining statements to use KDAAXX instead of KDGGXX. The MATMOD that punches the DMIG would need to be changed to:
     
    MATMOD KDAAXX,EQEXIN,USETNL,,,/,
          /16/PUNCHFLG/SORTFLG//////////'KAAEXT'/'A' $
     
     
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  • 0
    If you do not want the GSET info at all, just put it after this:
     
    compile nlstatic list noref $
    $
    ALTER 'END $ NLSTATIC'(1,-3) $
     
    And then edit the remaining statements to use KDAAXX instead of KDGGXX. The MATMOD that punches the DMIG would need to be changed to:
     
    MATMOD KDAAXX,EQEXIN,USETNL,,,/,
          /16/PUNCHFLG/SORTFLG//////////'KAAEXT'/'A' $
     
     
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