7 Replies Latest reply on Jul 2, 2014 3:27 PM by Jared Conway

Static study results problems

Raivo Jakovels Jun 27, 2014 5:05 AM

Hi!

Here I am with another problem from the same bag. I am trying to find out how circumference of an aluminum measuring wheel changes when temperature changes. I am using Static Study, with inertial relief and zero strain reference temperature +20° C in Flow/Thermal effects tab. Then I added External load -- Temperature(I tried both - above and below +20°C). The problem is: when I look at the deformed result - it is OK - the deformed part shrinks when temperature is below +20°C and expands when it is higher as you can see:

But when I make body from deformed shape, it is always the same when i open it in SW and chosing not to recognozie features. The circumference and other sizes stay the same. So I can't see the change in size. Any ideas? Model attached. Thanks in advance.

pashtaisits500.SLDPRT.zip 153.6 KB

Re: Static study results problems

Mike Pogue Jun 27, 2014 11:48 AM (in response to Raivo Jakovels)

I can't answer your question about saving the deformed body. But if the wheel is homogeneous, it would be easier to just scale the entire part by the appropriate factor, = 1 + (Delta T)*CTE. Youcan look up the CTE in the materials properties in silidworks.
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- Re: Static study results problems
  
  Raivo Jakovels Jun 27, 2014 3:12 PM (in response to Mike Pogue)
  
  Thank You for interest and answer. I know this method, and its 100% linear. But the thing is - the deformed shape is totally as it should be if I use a simple brick with a hole through it. So where is the problem with my part?
  
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Re: Static study results problems

Jared Conway Jun 28, 2014 2:14 AM (in response to Raivo Jakovels)

What happens when you apply a restraint?

What do you mean about recognizing the feature?

If you analyze a cantilever beam what happens?
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- Re: Static study results problems
  
  Raivo Jakovels Jun 30, 2014 2:18 AM (in response to Jared Conway)
  
  1)When I choose the hole as fixed(as it would be), nothing changes - the deformed model is still the same.
  2)When I am opening deformed part, SW first asks if I want to proceed with feature recognition(I chooce No, cause otherwise it goes crazy - it cannot make up a logical part cause it is "deformed").
  3)With a beam everything is totally OK - it expands as temperature increases and shrinks when T decreases. I mean - these changes are measureable in deformed part.
  
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  - Re: Static study results problems
    
    Jared Conway Jul 1, 2014 9:07 PM (in response to Raivo Jakovels)
    
    when you add a restraint, do you also disable soft springs/inertial releif?
    
    recognizing the feature, now i understand, yes, featureworks would not be able to do the feature recognition
    
    i suspect that you have something wrong with your setup. potentially the soft spring still enabled. i'd post your model here.
    
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    - Re: Static study results problems
      
      Raivo Jakovels Jul 2, 2014 4:37 AM (in response to Jared Conway)
      
      yes, inertial relief and soft springs are disabled. and the model is attached at the first post
      
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      - Re: Static study results problems
        
        Jared Conway Jul 2, 2014 3:27 PM (in response to Raivo Jakovels)
        
        post the most recent version with your restraint on it..etc.
        
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