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I am currently conducting a nonlinear implicit transient thermal stress analysis of a structure. By inputting the corresponding thermal expansion coefficients of the material, I aim to perform a thermal stress analysis under the overall temperature change of the structure, with the analysis step type set to Non-linear transient.I have created two TLOAD entries: one for storing enforced displacement loads and the other for enforced temperature loads, which are then integrated using a DLOAD entry. For the enforced temperature load, I first created an SPC entry, followed by an SPCD entry to store the enforced temperature. However, an error occurred after the calculation. Could you please advise on the possible cause of this issue?
You are solving a structural analysis with thermal load, not a pure thermal analysis.
So, as I mentioned above SPCD cannot resemble temperature, it should be a TEMP bulk data card in the EXCITE field of TLAOD of type=TEMP.
Hello,
In structural analysis, like in your case, temperature can be given by TEMP entriess, which can be referenced in TLOAD as well.
https://help.altair.com/hwsolvers/os/topics/solvers/os/temp_bulk_r.htm?zoom_highlight=temp
Your set up is valid for thermal analysis, where SPC, SPC1, and SPCD are temperature boundary conditions
https://help.altair.com/hwsolvers/os/topics/solvers/os/thermal_analysis.htm
I’m not entirely clear on what you mean. Here’s my model—could you please take a look? It seems that the enforced temperature I set through SPC and SPCD isn’t taking effect. How should I adjust my model settings?
Do you mean that I should apply the temperature via the "temperature" card command under "analysis", with the card type set to TEMP, and also select TEMP as the type in TLOAD? Is my understanding correct?
Thank you very much—this has been extremely helpful. I have one additional question to consult with you: Does OptiStruct support structural optimization under non-linear transient load steps, such as shape optimization and topology optimization? In the optimization responses, I noticed the "Transient Displacement" option, with a "Time" parameter in the bottom right corner where integer values like 0, 1, 2, 3, etc., can be entered. I am wondering what the function of this parameter setting is.
