Shell Optimization but NO DESIGN MATERIAL OR DESIGN VARIABLES FOUND

Ken Casagrande
Ken Casagrande Altair Community Member
edited May 2022 in Community Q&A

I am trying to develop a rib pattern on a flat plate subjected to a uniform pressure load.

I don't understand why the Design variable is not being used.

What am I missing?

*****************************************

DESOBJ(MIN)=1
SUBCASE        1
  LABEL Pressure
ANALYSIS STATICS
  SPC =        1
  LOAD =        1
  DESSUB =       2
BEGIN BULK
DOPTPRM DESMAX  30      DISCRETE1.0     

DSIZE   1       PSHELL  1       
+       THICK   1.0     10.0    
DTPG           2PSHELL  1       
$GAUGE         1       1
DESVAR         3gPSHELL_4.0     1.0     10.0            
DESVAR         4   ribs24.0     1.0     10.0            
DVPREL1 1       PSHELL         1       4                0.0     
+       3       1.0     
DRESP1  1       weight  MASS                                    
DRESP1  2       deflectiDISP                        TXYZ              62
DCONSTR        1       2        10.0                            

DCONADD        2       1

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Answers

  • Ken Casagrande
    Ken Casagrande Altair Community Member
    edited May 2022

    OPTIMIZATION PROBLEM PARAMETERS :
    ---------------------------------

     NO DESIGN MATERIAL OR DESIGN VARIABLES FOUND  : ANALYSIS ONLY

       ------------------------
       Static Subcase Summary :
       ------------------------

       ----------   --------  -------  ---------------------
       Subcase ID    SPC ID   LOAD ID  Preloading Subcase ID
       ----------   --------  -------  ---------------------
            1            1          1
       ----------   --------  -------  ---------------------

       Run Type                        :   Analysis Only (No design elements)

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