Overclosure message doesn't match with the results in CAE
Overclosure message doesn't match with the results in CAE
(OP)
Hello, everyone.
I am modeling a forming problem. But the calculation diverged at the increment 545.

At increment 534, the difficulty of convergence appeared, and from msg file, it readed:
***WARNING: CONTACT SURFACES ASSEMBLY_METSURF2 and ASSEMBLY_CERASURF22 NODE
NUMBER 1 INSTANCE TUBE-1 IS OVERCLOSED BY 0.18470 WHICH IS TOO
SEVERE--CUTBACK WILL RESULT. YOU MAY WANT TO CHANGE THE VALUE OF
HCRIT (4.22951E-02) ON THE *CONTACT PAIR OPTION.
***WARNING: CONTACT SURFACES ASSEMBLY_METSURF2 and ASSEMBLY_CERASURF21 NODE
NUMBER 37 INSTANCE TUBE-1 IS OVERCLOSED BY 4.88247E-02 WHICH IS
TOO SEVERE--CUTBACK WILL RESULT. YOU MAY WANT TO CHANGE THE VALUE
OF HCRIT (4.22951E-02) ON THE *CONTACT PAIR OPTION.
But indeed these two nodes didn't contact with the master surfaces, which is shown in the diagram.


Here it is clear that the node 1 and 37 have openings with the master surface indicatd by the red line.
Is this the fact that wrong judgement of contact caused the convergence problem in calculation?
I tried in changing the value of HCRIT, but it seemed to help little.
Thanks a lot for any tips.
I am modeling a forming problem. But the calculation diverged at the increment 545.

At increment 534, the difficulty of convergence appeared, and from msg file, it readed:
***WARNING: CONTACT SURFACES ASSEMBLY_METSURF2 and ASSEMBLY_CERASURF22 NODE
NUMBER 1 INSTANCE TUBE-1 IS OVERCLOSED BY 0.18470 WHICH IS TOO
SEVERE--CUTBACK WILL RESULT. YOU MAY WANT TO CHANGE THE VALUE OF
HCRIT (4.22951E-02) ON THE *CONTACT PAIR OPTION.
***WARNING: CONTACT SURFACES ASSEMBLY_METSURF2 and ASSEMBLY_CERASURF21 NODE
NUMBER 37 INSTANCE TUBE-1 IS OVERCLOSED BY 4.88247E-02 WHICH IS
TOO SEVERE--CUTBACK WILL RESULT. YOU MAY WANT TO CHANGE THE VALUE
OF HCRIT (4.22951E-02) ON THE *CONTACT PAIR OPTION.
But indeed these two nodes didn't contact with the master surfaces, which is shown in the diagram.


Here it is clear that the node 1 and 37 have openings with the master surface indicatd by the red line.
Is this the fact that wrong judgement of contact caused the convergence problem in calculation?
I tried in changing the value of HCRIT, but it seemed to help little.
Thanks a lot for any tips.





RE: Overclosure message doesn't match with the results in CAE
MRG
http://www.analysis.demon.co.uk
RE: Overclosure message doesn't match with the results in CAE
I had this type of warning when rigid body motion occured.
I guess that this can happen some way when a part isn't constrained anymore due to too big deformation.
So make sure that none of the parts can move freely in space during the forming process.
G