I'm using cdp model on a reinforced concrete structure in which there are two different type of concrete (C45/55 and C55/67). Oce the analysis starts it is almost impossible to reach convergence (15 attempt and increment time of 1e-10). So, is it correct to use cdp model with two type of concrete in the same analysis? If no, why? and if yes, how can I solve the convergence problem?
Thank you all.
Seema S. Thank you. I'll try to follow your suggestions. Firstly, I'll try to decrease the mesh size.
Try relaxing the tolerances from other -->solver controls--> manager. All the best!
Sumeru Nayak which value of tolerance? I tried every of your suggesstions but still doesn't work Seema S.
If you use value 0 for viscose parameter at CDP model you will have convergence problem. Try to change convergence criteria but try to use value for viscose parameter different than 0 (say 0.0001).
You can mix concrete material models in the same overall assembly, by assigning different material attributes to different geometry features, as normal.
I personally would not change the convergence criteria, as others have suggested, unless you are absolutely sure that every other parameter you have set in the model is correct.
One mistake I first made when using the CDP model was the define the compression and tension stress/strain or stress/crack width curves in terms of absolute strain, starting at (0,0), rather than plastic strain. In fact, ABAQUS requires that the curves are defined from the onset of inelastic behaviour, which might be 0.3*fc or 0.9*fct.
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