New Ansys user - Unconverged Solution Problem
New Ansys user - Unconverged Solution Problem
(OP)
Hi all, I'm a new member to the forum and I've lurked here for a while as I've found solutions to my previous issues deep within the forum. However, I have an issue with my current ANSYS problem (I'm also a rather green ANSYS user). I'm working in ANSYS APDL 14.0 with a 2D axisymmetric model.
I'm using Plane13 elements to represent magnetic coils that transfer load to a structure made of Plane82 elements. Everything is bonded, with no contact elements, mesh size is 1mm.
Since I'm relatively new to ANSYS in general I am having trouble figuring out how to solve this. Any help would be greatly appreciated.
I'm running into this convergence problem as stated by ANSYS:
I'm using Plane13 elements to represent magnetic coils that transfer load to a structure made of Plane82 elements. Everything is bonded, with no contact elements, mesh size is 1mm.
Since I'm relatively new to ANSYS in general I am having trouble figuring out how to solve this. Any help would be greatly appreciated.
I'm running into this convergence problem as stated by ANSYS:
CODE
*** WARNING *** CP = 298.992 TIME= 09:15:03
There are 1 small equation solver pivot terms.
DISP CONVERGENCE VALUE = 0.3883E-02 CRITERION= 0.7839E-03
EQUIL ITER 6 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= 0.5596E-03
FORCE CONVERGENCE VALUE = 0.5743E+06 CRITERION= 928.3
*** WARNING *** CP = 302.798 TIME= 09:15:05
There are 3 small equation solver pivot terms.
DISP CONVERGENCE VALUE = 0.3965E-01 CRITERION= 0.7839E-03
EQUIL ITER 7 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= -0.3232E-02
*** ERROR *** CP = 304.155 TIME= 09:15:06
Negative Jacobian 2D.
*** WARNING *** CP = 304.155 TIME= 09:15:06
The unconverged solution (identified as time 8 substep 999999) is
output for analysis debug purposes. Results should not be used for
any other purpose.
R E S T A R T I N F O R M A T I O N
REASON FOR TERMINATION. . . . . . . . . .ERROR IN ELEMENT FORMULATION 




RE: New Ansys user - Unconverged Solution Problem
I am using Ansys for structural problems, different from your field.
But about your problem, I think you should pay attention to the type of elements that you are using in the same model. Plane13 is a 4-node element while Plane82 has 8 nodes. How we can match 4 nodes to 8 nodes in boundaries? Also Plane82 has just 2-degrees of freedom in each node while it could be 4 degrees for the Plane13, in fact we can not match theses two elements in a common joint without coordinating DOFs. If you care about these matters, you may solve your problem.
Hassan