Reading temperatures

[MNS747]

Hi
Please help if possible

1) For doing a coupled temp-displacement analysis,
Is it convinient to do a single coupled temp-disp analysis OR convinient by reading it from previous analysis?

2) How to save temperatures in order to read them in second analysis.

3) If reading so, Shall we have to give Step1 increment1 in the predefined field?

thanks in advance
Regards

 

[corus]

1) Coupled tempaerature displacement analyses should only be carried out if, say, the gap between objects changes significantly to affect conductivity or radiation across the gao. You would probably have gap conductivity as a function of distance defined for this kind of analysis. These types of analyses are expensive computationally though, and should be avoided if possible.

2) I tend to safe the temperatures in a .fil file though you can simply read them from the .odb file these days. Old habits die hard. Use the *Node file card to save them in the .fil file, and use *temperature, file=... to read them back in the *static analysis.

3) In the manual it says to use the options bstep, and binc for the time that the temparetures are read from (optional), and estep, einc, for the time that theu're read to. The other option to use is 'interpolate' for dissimilar meshes.

corus

 

[MNS747]

Thanks corus for your reply

that means I have to stick with "general static" step and then start reading temperatures. Thanks again for your answer.

regards

 

[MNS747]

What I understood
General Static step will give the same results as coupled temp-displacement step would if there is nothing to caculate gap conductances.

Can I expect the same displacements from Static General analysis as I would from cou;ed temp-displacement analysis. Sorry if its repeated.

regards

 

[corus]

In a word, yes. If the temperatures depend on the displacements and hence vice versa iteratively, then use coupled temperature-displacement, otherwise if there is no dependancy then the answers will be the same, and obtained in much less time.

corus

 

[MNS747]

thanks corus. thanks alot