thermal analysis

[vinston1]

Hi all,
I would like to simulate tensile test at higher temperatures i.e. I want to do thermal analysis of my material. So is it just enough to select entire set of nodes of my model, assign the temperature and continue like normal FEM simulation?? Or do I also need to apply thermal boundary conditions? How am I supposed to do a thermal analysis exactly??
Thanks in advance
Vinston

 

[Stringmaker]

If temperatures are known you can apply temperature using the TUNIF or BF commands. A stress free reference temperature can be set using the TREF command. Anything further and you would have to solve a thermal analysis and apply those results in the structural analysis to produce the desired effects.

-Brian

 

[ansysfreak]

Hi

If you want an interaction between the temp. and the stuct. you can do this by using and coupled field analysis.

Grtz
Garry

 

[TGS4]

While the advise given above is laudable, I would ask you to ask yourself the following questions:
What am I trying to accomplish? Is it the interaction between the higher temperature and the material strength/stiffness? Is it the effects of restrained free thermal expansion?

Then, ask yourself if the temperature of your experiment (real or virtual) is uniform or not? If you know the temperature (whether uniform or varying in a pre-determined manner) "a priori", then is there really a need for you to conduct a thermal analysis whereby the program calculates said temperature for you?

Your question "How am I supposed to do a thermal analysis exactly??" kinda scares me. To start with, you should have a thorough understanding of the fundamental principles of heat transfer. Then, I would RTFM. If you have any SPECIFIC questions, please come back to the forum. Otherwise let us know that you are thinking about these questions and will return once you have properly contemplated them.

 

[vinston1]

Thank you all for the responses,
I will try to answer your question TGS4,
Yes, I am trying to accomplish the interaction between the higher temperatures and the material strength.

Temperature of my experiment is uniform.

I know the properties of the constituents at the temperature at which I conduct simualation, and what I need to find out is the strength/stiffness of the whole material at that temperature.
Does it make sense??
Thanks alot,
Vinston

 

[TGS4]

OK - so where does that lead you? Regardless of what temperature your analysis is simulating, you need to include such parameters as Young's Modulus, Poisson ratio, Yield stress, etc. So, the obvious answer is that you need to input this data for the temperature of your simulation. There is no need to be messing around with applied uniform temperatures and reference temperatures. Just input your material properties and perform the analysis.

Make sure that you acknowledge the assistance from this forum when you present the results to your professor...

 

[vinston1]

Actually that was my question TGS4. I thought so, as my analysis is isothermal I can apply the scheme of RT.
Surely, your assistance is aknowledged.
Thanks alot,
Vinston