linear temperature as a load on nodes

Altair Forum User
Altair Forum User
Altair Employee
edited March 2021 in Community Q&A

Hi everyone,

 

I'm conducting coupled thermal/structural stress analysis using Optistruct. As structural loads, I have spcs (load collector:spc) and a rotational force (load collector:rotation using RFORCE as card image).As a thermal load I've linear temperature on the nodes belonging to one surface. For the thermal stress analysis, I've created another load collector named 'temperature' and then I've defined on the nodes linear temperature using the temperatures panel. The load type was set to TEMP according to tutorial OS-1100: Thermal Stress Analysis of a Printed Circuit Board with Anisotropic Material Properties. Then for the load step, I'm creating a single load step using analysis type 'linear static' defining the spcs and loads(rotation) and in the TEMP section I'm choosing 'temperatures' from the load collectors. However I become the following error: *** ERROR # 4800 *** Grid 15361 connected to element 44763 has no temperature specified in load set 3. To apply zero temperature on this grid, SYSSETTING,undeftemp,zero needs to be added to the deck. Can anyone help me solving this problem?

 

Best Regards

Mert

     

 

 

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited July 2015

    Hi Mert,

     

    could you please share the entire out file?

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited July 2015

    Hi Prakash,

     

    here is the out file, but because of the termination of the simulation due to this error you will only see the errors that I've already written in the first post. Below the out file you will find the input file too.

    Unable to find an attachment - read this blog

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2020

    Hi, Prakash, I'm also having some problems with a similar case. I leave my out and fem file if you can help me please.

    Unable to find an attachment - read this blog

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited May 2016

    Create a TEMPD load collector card with some temperature value and call this in TEMP subcase information section.

    Regards

    Rahul R

  • Akshay Deshmukh
    Akshay Deshmukh Altair Community Member
    edited March 2021

    SAME ISSUE 

    Messages for the job:


    *** ERROR # 4800 ***
    Grid 31 connected to element 1979 has no temperature
    specified in load set 1. To apply zero temperature on this grid,
    SYSSETTING,undeftemp,zero needs to be added to the deck.

    ****************
    Too many error messages. Aborting run.
    Current limit is 10000. Use "MSGLMT" control card to change this value.

     

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