Nonlinear problem on Elastic couplings.
Stefo Peev Feb 24, 2014 12:54 PMHi, everyone. I have a problem with nonlinear simulation of elastic coupling. I want to simulate the deformation of the elastic element (rubber) with 80 Nm torque. Everytime I get a different error of the simulation. I was trying everything to get done, but that simulation it pissing me off. Can anyone help me for that? Now I will write every option and settings, that I have given to the simulation.
1. Nonlinear simulation study.
2.Simulation properties.
2.1. Autostepping.
Initial time increment  0.01;
Min  1e008; Max  0.1;
No. of adjustments  30.
2.2 Geometry nonlinearity options.
Use large displacement formulation.
2.3. Solver.
Direct Sparse.
2.4. Incompatible bonding options.
More accurate.
2.5. Advanced Options.
Control  Force;
Iterative  NR;
Integration  Newmark;
Do equilibrium iteration every  1 step;
Maximum equilibrium iterations  30;
Convergence tolerance  0.001;
Maximum incremental strain  0.01;
Singularity elimination factor  0.
3. Material properties.
3.1. Coupling  ANSI 1020.
3.2. Elastic element  Rubber.
Model Type: Hyperelastic  Mooney Rivlin;
Poisson Ration  0.4995;
Thermal Expansion Coefficient  0.00066 /K;
First constant  5.79 N/mm^2;
Second constant  1.45 N/mm^2;
Mass Density  1000 kg/m^3;
Tensile Strenght  13.79 N/mm^2.
P.S. I was trying with Stress  Strain Curve, too.
4. Connections.
4.1. Component Contacts  Global Bonded Contact with Compatible Mesh.
4.2. Contact Sets  No penetration (for all faces); Surface to Surface; Friction  0.8.
P.S. Contact face between eight cylindrical faces and thumbs of coupling is 100 mm^2.
5. Fixes.
5.1. Half of the coupling is fixed.
5.2. On a bore of the other half of the coupling is set on Fixed Hinge.
6. External Loads.
6.1. On a bore of the same half of the coupling is set 80 Nm torque.
7. Mesh.
7.1. Standart mesh  size 6.5 mm; tolerance  0.15 mm; draft quality mesh.
7.2. Mesh control of the Rubber  size 3 mm; a/b  1.5.
I am attach picture of the coupling.

Coupling.JPG 125.2 KB