5 Replies Latest reply on Nov 25, 2010 12:31 AM by Kieran Choy

Spring reaction

Valentin Leung Nov 23, 2010 4:18 AM

Dear All,

I have a kind of elastomer material that I want to simulate, basically, it's a disc with a hole in the middle I move its edge vertically over a ball, the ball will deform the disc to a certain point. Now I want to know if I can simulate the relaxation of the disc, if it would be strong enough to retain its shape? I suppose that the material has been deformed elastically.

The elastomer's specs have been determined empirically, we took a slab of material and pulled it at different length and noted the force to build up a stress strain curve. the curve is a line pretty much straight.

Is it possible on Simulation to simulate that? Right now, I am at the end of the first phase, I pushed the disc onto the ball to have it deformed. Now I want to cancel all force and see if the disc would go back up and retain its shape.

Thanks.

Re: Spring reaction

Stefan Wozniak Nov 23, 2010 8:15 AM (in response to Valentin Leung)

If material is linear (stress strain) and you not exceed yield strength then it will always go back to first shape. You don't need simulation for it.
If you go beyond yield and you have full stress strain curve for material you can calculate shape after remove force but only in SimulationPremium (non linear analyse)

If you just need to check if model stresses will go beyond some limits ie. yielding you can do that in SolidWorks sim. Perhaps even in eXpress.
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- Re: Spring reaction
  
  Valentin Leung Nov 23, 2010 8:26 PM (in response to Stefan Wozniak)
  
  Thanks, so as I am still on my stress-strain curve, it should go back to normal then.
  
  I am using Simulation Premium and nonlinear analyzis.
  
  But thing is, I want the part to kind of activate something, I am working on a kind of button, and I want to know if the part with all its strength is able to pull back up something. That's why I wanted to simulate that case.
  
  Thanks
  
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  - Re: Spring reaction
    
    Bill McEachern Nov 24, 2010 8:57 AM (in response to Valentin Leung)
    
    Did it go back to the original shape when you took it out of the test machine?
    
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    - Re: Spring reaction
      
      Valentin Leung Nov 24, 2010 9:34 PM (in response to Bill McEachern)
      
      Yup, actually, we made the test by hand with a push force guage. We did it several time and average the result by taking outstanding one to get a bit more accurate results.
      
      Regards,
      
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Re: Spring reaction

Kieran Choy Nov 25, 2010 12:31 AM (in response to Valentin Leung)

Try doing it it Motion Analysis. Apply the force over time and then remove it and see if the disc pushes it back up.
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