Hi everybody,
I have a problem with my simulation - each time it reaches minimum time increment although it is very small (1e-7).
It is a static simulation of pressing of the sealing into the grooves where the grooves are modeled as surfaces with Rigid Body constraint. There is only 1 step (Pressing) where one of the surfaces (Pusher) pushes down by 1.06 mm (so 1e-7 as a minimum time increment is small enough to overcome some convergence difficulty in my opinion).
My hyperelastic model is 3-rd Yeoh where the constants are based on the real measurement (for volumetric behavior, d1=0.001 MPa^-1). I am using hybrid elements C3D8RH. Below you can see some details from input file regarding interactions, step and boundary condition. Below mentioned interaction property was used for all contact pairs (including 2 self contacts).
*Surface Interaction, name="f0,2"
1.,
*Friction, slip tolerance=0.005
0.2,
*Step, name=Pressing, nlgeom=YES, inc=1000, unsymm=YES
*Static, stabilize=2e-05, allsdtol=0.05, continue=NO
0.01, 1., 1e-07, 0.05
** Name: VP Type: Displacement/Rotation
*Boundary
RP-VP, 1, 1
RP-VP, 2, 2
RP-VP, 3, 3
RP-VP, 4, 4
RP-VP, 5, 5
RP-VP, 6, 6
** Name: PS Type: Displacement/Rotation
*Boundary
RP-PS, 1, 1
RP-PS, 2, 2
RP-PS, 3, 3, 1.06
RP-PS, 4, 4
RP-PS, 5, 5
RP-PS, 6, 6
So my question is - how can I make this simulation converge? I can see that the sealing is quite deforming but the error is not related to distorted elements, it is related to disp. correction too large in a nodes that are not particularly special.
Thank you all.
