CMS reduction and thermal load

David Cha_22200
David Cha_22200 New Altair Community Member
edited January 2022 in Community Q&A

Hello,

I am trying to perform a CMS reduction, and include load vectors, which are then exported to a pch file.

To add load cases to the CMSMETH I am using the LOADSET flag.

I can include gravity load vectors without problem (LOAD 1 and 2), however LOAD 5 (the thermal one) does not produce any result in the resultant pch file. I am including the thermal expansion coff in the material prop definition, so I am not exactly sure what I am doing wrong. 

CMSMETH = 9
MODEL=ALL,ALL,ALL
SPC = 1
TEMPERATURE(INITIAL) = 4
SUBCASE 1
BEGIN BULK
CMSMETH 9 CBN 2000.0 0 LAN
LOADSET BOTH 1 2 5

PARAM,EXTOUT,DMIGPCH
GRAV,1,,9.81,1.0,0.0,0.0,$
GRAV,2,,9.81,0.0,1.0,0.0,$
TEMPD,4,0.
TEMPD,5,1.

...

PSOLID 1 1 0
MAT1 1 71000. 0.315 2.66E-9 2.31E-5 0.

 

Thanks,

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Answers

  • Xiaolei
    Xiaolei
    Altair Employee
    edited January 2022

    Hi David,

    In Service Now, Yudong has replied you with the answer and workaround. I will copy the answers here as a record and a reference for other. 

    OptiStruct doesn’t directly support thermal loading CMS yet.

    However, we have a workaround for it. The workaround will utilize Altair Compose scripts (Installing Altair Compose is needed) to extract applied forces from thermal analysis and apply them to the structural model and run CMS job. 

    Slides and compose scripts are attached in this reply. 

     

    Thanks. 

    Xiaolei

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