Modeling PTFE: Viscoplastic (Non-LEM)

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xborras7
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Joined: 02 Sep 2013, 21:44
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Modeling PTFE: Viscoplastic (Non-LEM)

Post by xborras7 »

Hej,

I am working with a PTFE piece which I applied certain boundary loads. I have modeled it assuming a LEM behavior. Everything fine.

Now I want to increase the accuracy of the results using a Non Linear Elastic Material.

PTFE shows visco-plasticity: hardening, creep, ... may be even anisotropy. Is Elmer suitable for this application? I did not see anything related in the Elmer documentation.

Someone has faced this problem before?

Thanks in advance
jeroenr
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Joined: 16 Oct 2013, 21:41
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Re: Modeling PTFE: Viscoplastic (Non-LEM)

Post by jeroenr »

I don't have much experience using non-linear materials in FEA in general, but I'm also interested in the possibilities using PTFE and elastomer materials with the Elmer solver.

Would it be possible to use the Navier-Stokes equitions with very high viscosities to simulate creep ... ? (just an idea)
annier
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Joined: 27 Aug 2013, 13:51
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Re: Modeling PTFE: Viscoplastic (Non-LEM)

Post by annier »

Hi All,
Is it the non-linearity of the equation that has caused difficulty in implementing Non-linear Elastic Mechanics and Viscoplastic models in Elmer? Or, any other reasons?

A relevant post is as in this following link.

Yours Sincerely
Anil Kunwar
Anil Kunwar
Faculty of Mechanical Engineering, Silesian University of Technology, Gliwice
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