Thermal Stress Analysis

Shubham_20947

Hello sir,

I am getting error like this.

 

((((*** ERROR # 4800 ***
Grid 1 connected to element 1 has no temperature
specified in load set 2. 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.))))


I was analysing a heatsink 3D component for a practice purpose, and as per the problem statement I created the spc constraints and temperature on their respctive faces, but once clicking on Optistruct to obtain the result, I found this error appearing in the message log.
Can you please help me out here to resolve this issue?

 

Adriano_Koga

for thermal stress analysis, all grids need to have temperatures assigned, so that OS can calculate thermal expansion and so on.

Usually we run a thermal analysis first, and then use the temperatures as boundary conditions for all nodes, not only the face nodes.