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CONVERGENCE PROBLEM ROTATION CORRECTION TOO LARGE

CONVERGENCE PROBLEM ROTATION CORRECTION TOO LARGE

CONVERGENCE PROBLEM ROTATION CORRECTION TOO LARGE

(OP)
Hi, I'm a new Abaqus user.
I'm modeling the aortic valve in the systole phase(opening) .I'm using S4r element, with application of a pressure on the bot surface of the valve leaflet.

I've a problem in the convergence of my model.
This is the end of msg file:

AVERAGE MOMENT                     2.874E-04   TIME AVG. MOMENT      1.741E-04
 LARGEST RESIDUAL MOMENT            4.489E-07   AT NODE       4281   DOF  6
 LARGEST INCREMENT OF ROTATION      7.636E-04   AT NODE       4281   DOF  5
 LARGEST CORRECTION TO ROTATION     2.157E-05   AT NODE       4281   DOF  5
          ROTATION CORRECTION TOO LARGE COMPARED TO ROTATION INCREMENT
 

 ***NOTE: THE SOLUTION FAILS TO CONVERGE IN THE MAXIMUM NUMBER OF EQUILIBRIUM
          ITERATIONS ALLOWED.
 

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

It is a nonlinear static analysis where I use:

*INITIAL CONDITIONS, TYPE=STRESS
PR_MOD,0.000002,
** Step  1, stat_nnlin
** LoadCase, Default
**
*STEP, AMPLITUDE=RAMP, INC=10000, NLGEOM
This load case is the default load case that always appears
*STATIC,STABILIZE,FACTOR=1.E-5
        0.001,          1.,      1.E-20

Has someone any tip?
Thanks.

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