Assign Coefficient of thermal expansion (CTE) / temperature to RBE2 Element
Altair EmployeeHello,
I am using Optistruct for my thermoelastic simulation. I am investigating the thermal expansion of some components connected with RBE2 elements.
I am trying to assign CTEs to RBE2 elements. I have read that this is possbile by doing a card edit (screenshot).
After that I have chosen the nodes of the RBE2 elements (2 rigid spiders and a RBE2 connection for a bolt) and assigned the Temperature increase (BCs -> create -> Temperature).
I have included in the load step the initial temperatures for all nodes with subcase TEMP and the increased temperatures with subcase TEMP_LOAD.
Unfortunately the RBE2 element is not expanding. Surrounding solids and shells are normally expanding.
I guess that the CTE is assigned, but somehow the RBE2 element does not know, that its temperature increased... Does somebody have experience with that.
Thank you for your help.
Vincent
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Answers
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Which version of OptiStruct you have used for analysis? Can you please share us the .out file of the run.
Note: If using any lower version of OptiStruct 14.220 then please migrate to 14.230(rbe2 thermal expansion issue fixed) or latest version 2018.0.1
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Hello Rahul,
i am using the latest version of optiscruct.
Anyway, I solved the problem by repeating every step properly and the RBE2 element is expanding now. It seems like works exactly like I described.(assign alpha by card edit -> assign initial temp -> assign increased temp -> solve).
Another question: As I need to card edit every rbe2 spider, is there the possibility to card edit all the elements at once?
When I selected mutiple spiders and try to edit it, I get the message: 'No valid entities were selected'
Thank you for your help.
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Please set the config to rigidlink instead of rigid while card editing.
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Thank you. What is the difference between both?
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