Hi all,
I am trying to model a joint connecting 1D BEAM elements using ABAQUS connector element with the joint behaviour obtained in a separate 3D analysis. For example, I have a joint modelled in 3D SHELL element and after analysing this joint I obtained a moment-rotation relationship of this 3D joint. This moment-rotation relationship is then assigned to an ABAQUS connector element connecting the 1D BEAM elements in the 1D BEAM model.
My question is how do you correctly define the elastic and plastic range of behaviour in ABAQUS connector element?
1. Is the Elastic behaviour option only for the elastic range of my moment-rotation relationship or do I have to define the full elastic-plastic range in this behaviour option? If the latter is correct, I then need to tell ABAQUS in the Plastic behaviour option from what moment onwards in the full elastic-plastic range defined in the Elastic behaviour option where it should behave plastically?
2. I tried to define negative values in the Plastic behaviour option as my joint can have load reversal, however, it keeps giving me error. Is the Plastic behaviour option only allow positive values? If so is that mean ABAQUS assumed the onset of plasticity occurs at the absolute value of the number I specified for both directions? What if the onset of plasticity of my joint is different in 2 loading directions? Do I need 2 separate Plasticity behaviour options (1 for each direction) for it to work?
I know this is a long question, hopefully, there is someone out there who read through this and could provide me with some direction.
Many thanks,
Heng
[UPDATE] Still having issues when applying plasticity in my connector element. Below is the error I am receiving:
***ERROR: THE INDEPENDENT VARIABLES MUST BE ARRANGED IN ASCENDING ORDER
Note: I understand what this error means and I am sure that my plasticity was defined in ascending order, see snip below.
Many thanks for any help provided.
Regards,
Heng
Hi Si Hwa Heng,
Of course, elastic behavior should be defined separately. The first two lines in the Yield Force/Moment vs Plastic Motion table should be deleted because positive values are sufficient. In the case of Uncoupled option, the onset of plasticity will be the same at both loading directions. More difficult case is when the onset of plasticity is different in two directions. It is necessary to use Coupled option. You can learn more from the sect.31.2.4 Connector functions for coupled behavior of manual. Properly defined shift factor will allow to define different onsets of plasticity.
Hi Victor J. Аdlucky,
Just found out there was a reply. Thank you very much for your help. I will try to use your method and see if that works for me. Currently, I am using 2 connectors with different plastic rotation behaviours (arranged in parallel) between the 2 connecting points so that they can each handle the loading in the two opposite directions. If I am able to get what you suggest to work it would save 50% of the time for me!
Thanks again,
Heng
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