Currently I am working on numerical validation of the paper 'Laboratory and numerical analysis of steel cold formed sigma beams retrofitted by bonded CFRP tapes - extended research' (Article Laboratory and Numerical Analysis of Steel Cold-Formed Sigma...
) in ABAQUS software.The analysis got aborted due to errors like negative eigen value, displacement too big for contact and numerical singularity.
I have modelled the rigid bodies as discrete rigid, and given the interactions by selecting the surfaces in contact and used fixed boundary conditions.
I am attaching my .inp file for further clarification.
Thanks in advance
I think only general advice could be given here:
Strip the problem back to the simplest parts and make sure those work. Specifically, remove contacts and plasticity, does your model solve? (Contact can be substituted with displacement BC to test the overall model behaviour.) If not, review boundary conditions, loads, etc. If so, add in the next 'advanced' feature one by one, try solving until it breaks, and then you will know what caused it and you can fix it. Then onto the next one
Notet1: I haven't investigated what you are doing properly, but it feels like a large forming problem, wouldn't geometric non-linearity be important here?
Note2: If it is truly a contact related problem, consider trying general contact, a lot of research goes into that function from DS, there are some features that should be superior to the contact pair implementation.
Good luck!
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