Hi Basant

A unconverged solution can be caused by many reason. 

One reasons might be it's a large deformation problem, buckling happens in your problem. If you are using ansys APDL, and using implicit static solver. I recommend using the arc-length method. You can find how to turn on arc-length option, and some theory about this method in ANSYS theory manual.

Another way that might help is to use explicit dynamic solver. If your problem is a dynamic problem, explicit dynamic solver is a good way to try. But you will need LS-DYNA license in APDL. If your problem is quasi-static or static problem. You can add a damping in your problem, and let the system release to stable state. 

If you make sure the boundary is fine. The unconverged solutions are usually due to the singularity of stiffness matrix. Think about it,  you are solving [K][u]=[f], if [K] becomes singular, you can never solve it. Implicit dynamic solver is doing the same thing. It's solving [K][u]+[C][a]+[D][v]=[f]. The reason why explicit dynamic solver might help is that it's not solving equations. So, you can always get a solution. 

I hope this might help. Please tell me how it goes.

Best,

Jiadi