I have to perform a thermoelastic analysis of a optic, where I have the start temperature of the optic and the time history of the temperature on one face.

In the past, I have run static thermal analysis using discrete temperatures to generate temperatures at all structural nodes for further stress analysis.

I am looking for examples I can study in the setup of a run to compute nodal temperatures from a known boundary condition in order to get started.

Thank you,

Derek

0 Hrishikesh Phadke over 3 years ago

You can first run SOL 153 to compute the temperatures. The temp plots is used to create a spatial field which is then used as a LBC in the SOL 101 run. Run SOL 101/400 to compute the stresses due to temperatures.

Attached sample workshop.
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel
0 Hrishikesh Phadke over 3 years ago

Attached Files (1)

lesson10.pdf
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel
0 derek.lewis over 3 years ago

Thank you. I will review the workshop.

How would I include the temperature as a function of time?
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel
0 Hrishikesh Phadke over 3 years ago

If the task is about creating the Temp as a function in Time in Thermal run, then it can be done as shown in image.

But if the task is about mapping this temperature to the structural run which will also be transient run, then it becomes tedious to do the mapping manually in Patran.

You can use the SOL 400 restart capability from thermal to structural or look at running SOL 400 NLTRAN- HTRAN Chained or Coupled analysis. I would suggest looking at the below webinar.

simcompanion.hexagon.com/.../simacademy-webinar-archive--thermo-mechanical-analysis-using-sol-400-wm266

If your thermal data is coming from CFD type simulation then you can think about using MSC Cosim. Below is link to it.

simcompanion.hexagon.com/.../SimAcademy-Webinar-MSC-Cosim-for-Coupling-ScFLOW-and-MSC-Nastran
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel
0 derek.lewis over 3 years ago

The time varying temperatures would be generated and used in the same model for calculating stresses, so there is no separate mapping step. Also, I will use FEMAP as the pre/post processor for this analysis.

Derek
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel
0 Hrishikesh Phadke over 3 years ago

Ok. Transient thermal run is SOL 159.

You can use TEMP(PUNCH)=ALL in case control.

Then you can get the Temp data in PCH file and include in structural run. The TEMP Entries will be output at the last time step from the thermal run. So it is not exactly accurate, but should be sufficient if there is not high variations in temperatures.
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel
0 derek.lewis over 3 years ago

I will likely have to evaluate stresses in the optic for each timestep due to the rate and magnitude of the temperature changes.
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel
0 Hrishikesh Phadke over 3 years ago

SOL 400 coupled HTRAN-NLTRAN would be right way of doing it.. You will get some examples in the webinar link..
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel
0 derek.lewis over 3 years ago

Thank you for your help. I will post further questions as the model develops.
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel
0 Daniel Chu over 2 years ago

Here is a coupled transient thermal analysis of optic analysis into a thermal stress analysis in a single execution in SOL 400.

Attached Files (1)

WS_optical_mirror_coupled_htran_nlstatic.pdf
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel