Adding Contacts between my model parts

- April 10, 2019 at 1:53 pm
  
  fx213
  Subscriber
  
  Hello,
  
  I would like to ask you a question about contacts for a compression test model that I want to run, let`s say for static analysis.
  
  I have attached a picture with the compression test on a cylindrical sample of rubber.
  
  My question is how can I apply the correct contact options so that the rubber to be kind of stable on the bottom; I have applied fixed support,
  
  (as boundary condition) and how can I apply a contact type between the top plate and the rubber so as the analysis results to show the loads/ stress on the rubber mass?
  
  I have tried to apply loads (in fact displacement) on the top of the top plate, having applied contacts first by selecting both the bottom plate surface and the rubber cylindrical face. The results that I managed to obtained showed the analysis of the top plate and not on the rubber.
  
  By the way, the model is Input geometry, I haven`t created it in DesignModeler or SpaceClaim.
  
  If needed to build the geometry in ANSYS (DesignModeler or SpaceClaim), is there the option to add contacts between faces and where I can choose them from?
  
  Are there choice for contacts in both of these design tools? If so, do the used for 2-D model FEA analysis as well?
  
  Thank you.
  
  Kind regards,
  
  FX
  
  '
- April 10, 2019 at 3:21 pm
  
  peteroznewman
  Subscriber
  
  The best strategy for this model is to use two (or three) planes of symmetry, which can be created in DM or SC.
  
  If you use two planes of symmetry, they would be XY and and YZ. That will take away all DOF along the line of intersection except for Y displacement. The rubber is half the length, keep the front half, and the right half of the circle, so it is a 1/4 model. You can have a frictional contact between the rubber and the bottom plate, and the rubber and the top plate.
  
  If you use three planes of symmetry, you add an XZ plane through the center of the rubber and you only have the top, front, right piece of rubber, there is no bottom plate, and this is a 1/8 model.
- April 12, 2019 at 1:24 pm
  
  amnteno1
  Subscriber
  
  Hello FX, hello Peter,
  
  I like the idea of using symmetry to take the DOF away - in this case a good solution I think.
  
  I am working on a problem with some analogies to the problem described by FX. But in my case, the body that shall be compressed is not round or symmetric. What would you recommend in such a case? I want the body to deform in x- direction but I don't want it to flip away to the left or right site. Because of the nature of the problem, I don't want to use bonded contacts. I was thinking about the possibility to use some kind of springs to hold the Body. Is there any command to do so? Or do you have any other suggestions?
- April 12, 2019 at 5:44 pm
  
  peteroznewman
  Subscriber
  
  amnteno1, you can do a full model and use frictional contact, which will hold it in place. Open a New Discussion for your next question.
- May 2, 2020 at 8:39 am
  
  Shukla21
  Subscriber
  
  i tried giving frictional support between the top plate and specimen and also between bottom plate and specimen .i gave displacement of 10mm on the top face of top plate and gave fixed support to bottom plate but i am unable to get the result.Please guide me
- May 2, 2020 at 11:34 am
  
  peteroznewman
  Subscriber
  
  Shukla21, please open a New Discussion. You can include a link to this discussion if you want.
- May 2, 2020 at 4:08 pm
  
  Shukla21
  Subscriber
  
  yeah i have created a new discussion .Please guide me .
  
  link is given below
  
  /forum/forums/topic/compression-test-simulation-1/