Simulation stops at 50.9% and error message appears like this

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Solution failure in the First Step may be due to:

1. Lack of adequate fixtures for one or more parts

2. Material properties may not be properly defined.

3. Load Increment may be too large or too small.

(too small displacements -> convergence failure)

Contact convergence Difficulties:

1. A large initial interference -> Convergence failure

Use forces or temperatures to reduce interference,

at first. Then, gradually remove those loads.

2. You may consider switching source and target.

(The larger, smoother surface is preferred for target)

3. Use mesh control for contact areas with course mesh.

4. Use surface to surface option.

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and then

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Solution failure in a Step>1, it could be due to:

The solution may be at a buckling or limit point, i.e.,

displacements grow large under constant forces. If so,

for force control or contact problems, this is the end

of solution (check out the response graphs).

The solver numerical difficulties:

1. For Plasticity models, raise: ETAN >Ex/100.

2. For Nitinol, or large strain plasticity, set:

Maximum-Strain-Inc.=(or >)1. (0.01 defaults to 1.)

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I am attaching files with this, if any one could help.

Hi Krutarth,

I ran the nonlinear setup in your assembly and the solver does appear to stop just over 50% complete. Looking at the results it would seem as though the gripper would be having stability issues as it reaches the cylindrical section of the recess.

I made some modifications to a test case of your model where I 1) cut it into a quarter symmetry and applied symmetry fixtures to the resulting cut faces, and 2)) changed the solver control scheme to "Arc Length" control (its a little more forgiving in my experience). The solver seemed to proceed much further than before with these changes.

Also, keep in mind, having a nonlinear solver go to 50% does not mean failure of the analysis. It means only that the solver has reached 50% of the applied load condition. If the boundaries themselves are accurate the results are still generally valid as well.