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simplifying assembly for simulation

Question asked by Clinton Siburian on Sep 11, 2014
Latest reply on Sep 18, 2014 by Mark Dougall

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Hello my name is Clinton and new in solidwork simualation

I have problem with simulation. My Full assembly is so big and complex so need so much time to complete it.

This is the case :

My Asemmbly is composed by 7 part. 4 slip (the green) 2 base(gold) and 1 pipe. The green have a gap each other so it can move down.

In simualtion i will give force in top of the the green part, so it can move down and press the pipe.

I have tried use 1 degree and make symmetric fixture, but it didn't work. The symmetric make the green didn't move down and make wrong motion..

Please, can you help me to simplify this assembly in simualtion?

Mark Dougall Sep 15, 2014 6:57 AM

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Ok I'm seeing it a bit more clearly now. Are you using mesh control? With mesh control you can focus on the area where the green touches the pipe and would be faster than refining the entire mesh.

What contact are you using? I'm assuming there would be no penetration contact surrounding the green parts and the gold parts would get bonded to the pipe only.

Also for symmetry are you splitting the assembly like so:

I believe that should work out ok. I don't know much about 2D axis symmetry but think you're right in that it may not work here because of the gaps.

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Mark Dougall Sep 11, 2014 5:53 AM
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Hi Clinton,

Are there any fixtures on the assembly? I can't see from the image.

Also how are the parts connected. I am assuming the gold parts are attached to the pipe while the green is free to move?

For symmetry to work correctly you would need to cut the entire model in half. This isn't that big a model so your run time shouldn't take too long. I'm assuming theres an problem with contact.

Regards,

Mark
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- Clinton Siburian @ Mark Dougall on Sep 15, 2014 5:24 AM
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  Hi Mark,
  
  Actually there i a fixture in bottom of the gold but in hide mode.
  
  The one in free move up or down just the green. When move down the green will press the pipe. It can move down because there is a gap between one green to onother green.
  
  I'm looking for small deflection in pipe, so it will need small control mesh and need more time.
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  - Mark Dougall @ Clinton Siburian on Sep 15, 2014 6:57 AM
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    Ok I'm seeing it a bit more clearly now. Are you using mesh control? With mesh control you can focus on the area where the green touches the pipe and would be faster than refining the entire mesh.
    
    What contact are you using? I'm assuming there would be no penetration contact surrounding the green parts and the gold parts would get bonded to the pipe only.
    
    Also for symmetry are you splitting the assembly like so:
    
    I believe that should work out ok. I don't know much about 2D axis symmetry but think you're right in that it may not work here because of the gaps.
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    - Clinton Siburian @ Mark Dougall on Sep 17, 2014 12:54 AM
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      ya, the green have 'no penetration' contact with the other, but the gold have no contact with pipe. The Gold are rigid body.
      
      I will try the control mesh and that symmetry
      
      Thank you Mark
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      - Mark Dougall @ Clinton Siburian on Sep 17, 2014 5:50 AM
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        Let us know how it works out for you.
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        Clinton Siburian @ Mark Dougall on Sep 17, 2014 10:48 PM
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        Thank you Mark,
        
        I made the symmetri like in the picture and made control mesh in the surface of contact. It works and faster to simulate now.
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        Mark Dougall @ Clinton Siburian on Sep 18, 2014 4:11 AM
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        Excellent,
        
        Glad it worked out.
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Jerry Steiger Sep 11, 2014 5:27 PM
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Clinton,

You must have done something wrong when you tried using symmetry. It looks like your assembly is perfect for quarter symmetry. The run time for FEA generally goes up with the square of the number of elements, so half symmetry would only take one quarter as long to run and quarter symmetry would only take one sixteenth as long.

Jerry S.
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- Clinton Siburian @ Jerry Steiger on Sep 15, 2014 5:31 AM
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  Hi Jerry,
  
  Maybe i should tried it one more time.
  
  But, is the symmetry will reflect the gap between the green? Because without the gap, the green can't move down and press the gold not the pipe
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  - Jerry Steiger @ Clinton Siburian on Sep 15, 2014 3:26 PM
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    Clinton,
    
    Split your model the way that Mark suggested and you should be OK analyzing just one quarter of your model. In fact, take that quarter and split it down the middle and you should also be OK and it will solve in about one quarter the time.
    
    Jerry S.
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Jared Conway Sep 11, 2014 7:56 PM
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can you describe the goal of the analysis?
are you trying to use solid elements?
is there a reason why 2d wouldn't work?
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- Shaun Densberger @ Jared Conway on Sep 11, 2014 10:02 PM
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  Jared has the right idea here; this model screams 2D axisymmetry.
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  - Clinton Siburian @ Shaun Densberger on Sep 15, 2014 5:38 AM
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    The goal of the analysis is to find the deflection in pipe caused by pressure from the green.
    
    Yes i'm trying to do it, but it need so long time.
    
    i tried 2d but it didnt work. The 2d assumtion make the green become one part. And when i made the force in top of green it press the gold not the pipe.
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    - Jared Conway @ Clinton Siburian on Sep 15, 2014 3:36 PM
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      this is going to be challenging analysis, i would recommend speaking with your reseller and getting some guided training on this application. we offer it here at hawk ridge systems and call it mentoring. you can check it out on our website at http://www.hawkridgesys.com or you can contact me to discuss further at jared@hawkridgesys.com
      
      at minimum i'd suggest going through the tutorials and examples on 2d before you try applying to your model
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      - Jared Conway @ Jared Conway on Sep 15, 2014 3:36 PM
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        and you may find it helpful to post your model and where you are stuck to get some direct insight. even better, i'd suggest building a really simplified model so you have a second data point on whether it is your method or your model or the software causing you trouble.
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