li-ming-jiang
commented
4 years ago The steel01Thermal and steel02Thermal should have plastic behaviour which is the same as steel01/02 at ambient temperature. SteelEC would not exhibit plastic deformation so far
Hello,
I am currently working on a post-earthquake fire analysis model. I have noticed some strange results, therefore I made a little benchmark to see the plastic behavior of the material models developed for thermal analysis (especially Steel01Thermal, Steel02Thermal and SteelEC ).
I have created a simple dispBeamColumnThermal element which I loaded axially by a tensile force which exceeded the yield strength and then released the load to 0, without any temperature applied to the model. My goal was to see the permanent deformations for the different material models.
Steel01Thermal works well and the results are exactly the same as for Steel01. But I get wrong results in case of the other two models:
For Steel02Thermal I do not manage to get any plastic behaviour. The element stays elastic and does not undergo any plastic deformations even if I increase the stresses to 10 times higher than the yield stress. On the other hand the Steel02 model works well and gives the expected result.
For SteelECThermal the behaviour is a bit different, but it also stays elastic until the stress gets more than twice bigger than the yield stress. Furthermore I created another exercise for this model, where I increased the temperature of a simply supported beam and monitored the stress-strain response. A strange behaviour of this model is noticed (sudden jump - see the following figure https://imgur.com/a/TZAx5gB ).
Could you please let me know why can I not record any plastic deformations for the Steel02Thermal and SteelEC materials?
Thank you in advance, Zoltan