I am modelling an axial pull-out test for buried pipeline by using ABAQUS. I modeled pipeline as a shell element and soil as a solid element. I used Mohr-Coulomb plasticity to model the soil. There is a surface to surface contact between pipe and soil. I used kinematic coupling between a reference point and pipe surface. I applied axial displacement at the reference point. When I have only cohesion yield stress in my model, there is no issues related to convergence. However, I have convergence problem when I have friction angle in my model. The error I got is "The plasticity/creep/connector friction algorithm did not converge at points". What might be reason for that? Thank you very much in advance.
Hello Hasan,
Mostly I am getting the same error while modeling steel-concrete composite structures involving contact formulations. In most cases, I increase the viscosity of the concrete material to overcome the plasticity/creep/connector friction algorithm error. I am not sure about the material property you are using but for concrete, I use a viscosity value of 0.001~0.003 or more to solve that kind of error. but you need to check if the value doesn't compromise your results. check out if you have some window where you can input viscosity parameter for your soil property. I am not sure if this will help.
Good luck!
Hello Hasan,
Mostly I am getting the same error while modeling steel-concrete composite structures involving contact formulations. In most cases, I increase the viscosity of the concrete material to overcome the plasticity/creep/connector friction algorithm error. I am not sure about the material property you are using but for concrete, I use a viscosity value of 0.001~0.003 or more to solve that kind of error. but you need to check if the value doesn't compromise your results. check out if you have some window where you can input viscosity parameter for your soil property. I am not sure if this will help.
Good luck!
Try to add a small value of cohesion, this is a reasonable assumption if the sand has water content. Also you can use the option *stabilize in your step, but these kind of options should be used wisely due to the fact that can lead to unrealistic results.
Dear all,
Thank you very much for your response. I tried your advice and also I realized that I used some BC's improperly. Sorry for late reply. I was working on this problem. Thanks again.
Emre
Diptesh Chanda Provide a small value of cohesion in soil property
check this
https://www.eng-tips.com/viewthread.cfm?qid=191374
I have the same problem and i can't resolve it.
any help please.
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