Unconnected regions with analytical rigid components
Unconnected regions with analytical rigid components
(OP)
I get a warning about unconnected regions in the assembly, but so far I think I have put it all together as it should. There are 4 analytical rigid parts which now are connected to its reference point, and within these 4 components, there are a rubber "seal", which are modeled as a deformable. I have initiated the inetaractions between parts, I have constrained the reference point to the respective analytical rigid part, and also BC'd the reference points with an encastre. Could anyone help me?





RE: Unconnected regions with analytical rigid components
RE: Unconnected regions with analytical rigid components
RE: Unconnected regions with analytical rigid components
RE: Unconnected regions with analytical rigid components
Teh problem cut back after 5 incomplete iterations...
RE: Unconnected regions with analytical rigid components
RE: Unconnected regions with analytical rigid components
Q:
- can i prescribe a load to a reference point on an analytical rigid on a 2d axisymmetric analysis
- How do I coreectly define BC on reference point on a 2d axi?
RE: Unconnected regions with analytical rigid components
It sounds like the rigid body definition is correct. Maybe you have no active contact situation when you apply the load, which leads to a singularity and to nonconvergence. Open the .msg file and check what's written in there.
RE: Unconnected regions with analytical rigid components
The error messages are as follows;
***WARNING: THERE ARE 5 UNCONNECTED REGIONS IN THE MODEL.
NUMBER OF EQUATIONS = 4292 NUMBER OF FLOATING PT. OPERATIONS = 1.17E+07
USING THE DIRECT SOLVER WITH 8 PROCESSORS
CHECK POINT START OF SOLVER
CHECK POINT END OF SOLVER
ELAPSED USER TIME (SEC) = 0.60000
ELAPSED SYSTEM TIME (SEC) = 0.10000
ELAPSED TOTAL CPU TIME (SEC) = 0.70000
ELAPSED WALLCLOCK TIME (SEC) = 0
***WARNING: SOLVER PROBLEM. NUMERICAL SINGULARITY WHEN PROCESSING NODE
UPPER_AXD-1.1 D.O.F. 2. THIS NODE HAS NO STIFFNESS IN THE
SPECIFIED DIRECTION AND IS NOT COUPLED WITH THE REST OF THE MODEL.
***WARNING: SOLVER PROBLEM. NUMERICAL SINGULARITY WHEN PROCESSING NODE
PACKER-1.71 D.O.F. 2 RATIO = 14.2973E+12 .
ASYNCHRONOUS TRACKING ELEMENT LOOP STARTED
RE: Unconnected regions with analytical rigid components
RE: Unconnected regions with analytical rigid components
2. A gap is a problem when applying a load in a static step. A static solution means equilibrium. What is the opposite force against the load? Nothing. This leads to a singularity and usually nonconvergence.
3. When you have contact penetration and no stress at all, then you should check your contact definition.
RE: Unconnected regions with analytical rigid components