Square membrane subjected to pressure. ERROR on dof 3.
Square membrane subjected to pressure. ERROR on dof 3.
(OP)
Hi Everyone!
I am having some trouble using the membrane elements (elastic linear). I have a simple square subjected to pressure. The boundary conditions are that the four apex do not have displacements nor rotations. The error I get is too many attempts required although the time step is pretty small (and it should converge with 1, doesn't it?)
I get these warnings for a lot of nodes but i do not really understand it.
***WARNING: SOLVER PROBLEM. NUMERICAL SINGULARITY WHEN PROCESSING NODE
PART-2-1.7 D.O.F. 3. THIS NODE HAS NO STIFFNESS IN THE SPECIFIED
DIRECTION AND IS NOT COUPLED WITH THE REST OF THE MODEL.
Please find attached the .inp file.
Thank you very much for your help,amigos!!
I am having some trouble using the membrane elements (elastic linear). I have a simple square subjected to pressure. The boundary conditions are that the four apex do not have displacements nor rotations. The error I get is too many attempts required although the time step is pretty small (and it should converge with 1, doesn't it?)
I get these warnings for a lot of nodes but i do not really understand it.
***WARNING: SOLVER PROBLEM. NUMERICAL SINGULARITY WHEN PROCESSING NODE
PART-2-1.7 D.O.F. 3. THIS NODE HAS NO STIFFNESS IN THE SPECIFIED
DIRECTION AND IS NOT COUPLED WITH THE REST OF THE MODEL.
Please find attached the .inp file.
Thank you very much for your help,amigos!!





RE: Square membrane subjected to pressure. ERROR on dof 3.
[By the way, it is always a good idea to search in the forums or google before you create a new post.]
http://www.eng-tips.com/faqs.cfm?fid=376
http://www.eng-tips.com/faqs.cfm?fid=1083
RE: Square membrane subjected to pressure. ERROR on dof 3.
I have checked the boundary conditions before submitting the question. The thing is that dof 3 cannot (to my understanding) have a singularity since its value is imposed, 0, as all the other dofs.
Any more ideas, anyone?
Thank you very much!
RE: Square membrane subjected to pressure. ERROR on dof 3.
http://www.eng-tips.com/faqs.cfm?fid=376
http://www.eng-tips.com/faqs.cfm?fid=1083
RE: Square membrane subjected to pressure. ERROR on dof 3.
Read the Analysis User's Manual (Membrane elements section 28.1.1 in ABAQUS v6.12) for more. If that particular type of loading is essential to the problem at hand, then you might consider shell elements. However, I recommend reading the manual before trying anything.
http://www.eng-tips.com/faqs.cfm?fid=376
http://www.eng-tips.com/faqs.cfm?fid=1083
RE: Square membrane subjected to pressure. ERROR on dof 3.
Once again thank you very much for your help.