Hello everybody,
Could somebody help me with my simulations?
I'm trying to do a nonlinear static simulation in 3 steps in Abaqus.
Let me tell you a bit more about my simulations, my goal is to model a closed incision of the skin and deliver pressure through the foam.
This is the general view of my model (incision under the foam) (picture 1).
There are 4 tissue layers with an incision, which is covered by the foam. But there is a gap between the foam and first tissue layer.
Each side of the model is fixed with Encastre boundary conditions, there is the only exception for the bottom, which is free. The interaction properties between Foam and Epidermis is tangential behaviour - "Rough"; normal behaviour - "Hard contact". The type of contact is 'General contact".
- The first step is the incision closure (picture 2). I have applied displacement in Y and -Y directions in order to close it. And I succeeded with this. But there was a warning during all this step: "There is zero VOL. FLUX everywhere in the model based on the default criterion. please check the value of the average VOL. FLUX during the current iteration to verify that the VOL. FLUX is small enough to be treated as zero. if not, please use the solution controls to reset the criterion for zero VOL. FLUX."
- The second step is the foam movement down (picture 3). I have applied displacement in -Z direction for the top surface of the foam because I created a small gap (about 1mm). As well I saw the same warning message as for the previous step. Also, there is no contact pressure after foam "touched" the first layer.
- The third step will be pressure applied to the foam from both sides, which is in contact with the epidermis layer.
Ultimately, these are my problems.
1) How could I set contact after foam came down on the epidermis layer? And, which type of contact should I apply? 2) How to avoid this warning message or just to ignore it?
As well as, please find an attached *.cae file of my simulations. I will appreciate your help or suggestions about how to figure out this kind of issues.
Hello Alexey, what is the element type and the material model that you are using? Looking at the error I assume this is a coupled pore fluid/displacement analysis.
Hi, I always use:
*CONTROLS, ANALYSIS=DISCONTINUOUS on Step part.
The another way is:
*INITIAL CONDITIONS, TYPE=STRESS, FILE=(Your previous step).odb, STEP=1, INC=1
Change GRAV to Body force.
Good luck
- Badges
- Science topic
- Similar topics
- Agricultural Science
- Soil Science
- Soil Analysis