Hello every one, I wanted to investigate the behavior of a steel beam exposed to fire (thermal load). The objective is to track the mid-spam deformation and maximum stresses of a simply supported steel beam that exposed to 20 min heat transfer to beam (heat diagram increase from 22 centigrade in time 0 to 790 centigrade in time 20 min). I used Ansys workbench17.2 and used coupling of transient thermal and transient structural. My questions are as follow: 1- Is mentioned coupling the right way? 2- what material should I use for beam? When I use steel structure Non-linear with long deformation I got an error message. seems like that Ansys is npt able to model non-linear 3- I could not see any effect duo to thermal load on mid-spam deformation. It just cause longitudinal expansion, but nothing changed on the vertical direction.
thanks
Hi ,
Regarding your simulation (steel beam exposed to fire), I already did something like that using ANSYS multiphysics. In fact, if you apply your thermal load first to predict temperature distribution on beam and then you use the temperature as a load to predict mechanical deformations and stresses then that will be decoupled procedure and not coupled. Alternatively you can use the coupled procedure through choosing an element that has this feature.
Yes, coupling procedure is the right way for this type of simulation and you can apply it through using elements like SOLID226.
Considering non-linear behavior, ANSYS can apply this feature with easy through the material models.
If you expect large deformation, you should apply large deformation option i.e NLGEOM,ON..
Concerning question 3 I agree with Claudio Pedrazzi .
HI
thanks for your replies. I took all advises.
just to clarify beam's material is steel structure grade 345. I was wondering in Engineering Data in workbench how can I adjust properties to get changed by temperature? I believe that the problem is that I did not defined material properties correctly.
Thanks,
Dear Hossein,
my comments:
- your analysis is not really "coupled", because the results of mechanical simulation do not feedback on thermal analysis (your problem is just "multiphysics");
- regarding the effect of thermal load, you find only elongation (no vertical mid-span displacement) probably because the applied heat flux (thermal load) is constant along the beam's height. In this load configuration, you will find only elongantion no matter how large the thermal load is, even if you include plasticity.
To have bending, you must apply a thermal gradient (e.g. linear temperature variation) across the beam's height.
What is the procedure for simultaing thermal stress produced from nanoindentation?
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