Linear steady state heat to linear static displacement

[vanwees]

Hello,

If I run a simple simulation (linear steady state heat transfer) where I heat up a piece of steel (length: 100mm) to 300 degrees and then taking these results to linear static analysis I get a two times greater displacement than if I calculated it theoretically.

What I am doing wrong?

[John_Holtz · Accepted solution]

Hi @vanwees 

I think one of these things is wrong in your setup:

• Coefficient of thermal expansion. (Edit: Is the value wrong because you use a comma "," for the decimal symbol and Nastran likes to use the period "."?)
• Length. (Ok, I trust that you got this item correct.)
• Operating temperature.
• Stress free temperature. (I do not see the initial temperature of 20 C specified in the input. My guess is this was not specified in the material properties, or perhaps it is 0 K instead of 0 C or 20 C.)

If you still have a problem, feel free to attach your .ipt file to the forum, and someone will take a look at it.

John

[vanwees]

Dear John,
Thank you for your reply. 

The problem was indeed the initial temperature. ‌‌