Contact - error message

[highlander3]

I have simulated a simple contact - ball and plate. Contact is in one point and i have got nice results. But when i wonted to include
motion in one direction in the new step i stuck with error msg.
I tried to increase number of min.time increment, different formulation of contact, but all without success.

Any tip would be helpful
Thanks

this is msg. file:


***WARNING: SOLVER PROBLEM. NUMERICAL SINGULARITY WHEN PROCESSING NODE
BALL-TOP-1.2716 D.O.F. 2 RATIO = 1.40116E+13.

EQUILIBRIUM ITERATION 5

AVERAGE FORCE 6.980E-07 TIME AVG. FORCE .860
(FROM MOMENT FIELD)
LARGEST RESIDUAL FORCE -7.047E-03 AT NODE 5941 DOF 2
INSTANCE: BALL-TOP-1
LARGEST INCREMENT OF DISP. 1.715E+08 AT NODE 610 DOF 2
INSTANCE: BALL-TOP-1
LARGEST CORRECTION TO DISP. 3.429E+07 AT NODE 620 DOF 2
INSTANCE: BALL-TOP-1
THE FORCE IS ZERO EVERYWHERE BUT THE FORCE RESIDUAL OR
THE DISP. CORRECTION IS NON-ZERO

AVERAGE MOMENT 0.000E+00 TIME AVG. MOMENT 1.000E-02
ALL MOMENT RESIDUALS ARE ZERO
LARGEST INCREMENT OF ROTATION 6.018E-41 AT NODE 1 DOF 6
INSTANCE: BALL-TOP-1
LARGEST CORRECTION TO ROTATION -7.603E-42 AT NODE 5941 DOF 6
INSTANCE: BALL-TOP-1
THERE IS ZERO MOMENT EVERYWHERE


***NOTE: THE SOLUTION APPEARS TO BE DIVERGING. CONVERGENCE IS JUDGED UNLIKELY.


***ERROR: TOO MANY ATTEMPTS MADE FOR THIS INCREMENT

 

[xerf]

I tried to increase number of min.time increment, different formulation of contact, but all without success.

You need to decrease the value of the minimum increment.

 

[lubos38]

hi

ABAQUS explicit or implicit, try to apply a force instead of velocity. It looks you have to allowed one one direction for motion, becose it is overcontrained, try to do that in step2. Check your model. thax for reply.
bye