convergence problems

Hi mechanicians:

I decided to post because I have an inconvenience that is not shown in other posts.

I am working in the Abaqus - Fortran environment in a thermal analysis. After implementing a new procedure (which actually works), the .sta file shows me that it has problems in its unique step, more or less in the 60th iteration (it is supposed to get until 500). Twenty iterations after that gets into interruptions because the code cannot converge.

With these lines it is easier to understand my point:

Hi...

I am working on post buckling of a cylinder in ANSYS. I have included imperfections using NLGEOM command. I applied a load which is slightly higher than eigen value buckling analysis and i am using displacement controlled analysis using arc length method. I am getting the following error after certain time

"solution not converged

Arc length  value has reached its minimum allowed value

Run terminated"

Can anyone please help me how to resolve this issue.....

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