Excessive Distortion in a contact problem 1

[CivetCat]

I have already checked for the units for material and dimensions and they seem okay.

The case is a contact problem in which a rigid tube is inserted between the tissues.

Tissue Model: in cm
Length of tube model: 30 cm
Tube: - mass: 1300 kg
- Elastic modulus: 2410 MPa
Tissue: - mass: 1060 kg
- Elastic modulus: 10 kPa
Speed of tube: 20 cms-1

I am using S.I. unit in the problem.

I have been struggling in this problem for a week or so. Help is very much appreciated. Attached is the .cae file. Thanks in advance.

 

[akabarten]

Hi,

I successfully ran your model. Two points:

1. You are using fixed time increment, even more you have set time increment to 0.1 sec.
It is too high so for high initial velocity displacement of nodes for each increment is to high. I ran with automatic incrementation (in this case abaqus was using 0.00015 sec).

2. Please use element distortion control for deformable body. You can switch the option on in "Step" module.
Other -> ALE Adaptive Mesh Domain. If you don't want to use the remeshing please try make better mesh in contact region.

Regards,
akaBarten

 

[CivetCat]

akaBarten,

I have misconceptions in time increment. I found that it is not 'time period/time increment' = frames. It's always 20 frames no matter what I set. I'll refer to documentation on this. I am also not clear how the increment affects the velocity and leads to deformation. I got a 'Data are not complete' for creating a remeshing rule. I will try to find it out myself.

A lot of thanks! You solved my problem in a minute!

Many thanks,
Thomas